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kimageformats/src/imageformats/xcf.cpp
Albert Astals Cid aaa285a3b9 xcf: layer is const in copy and merge, mark it as such
2019-04-17 17:37:28 +02:00

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/*
* xcf.cpp: A Qt 5 plug-in for reading GIMP XCF image files
* Copyright (C) 2001 lignum Computing, Inc. <allen@lignumcomputing.com>
* Copyright (C) 2004 Melchior FRANZ <mfranz@kde.org>
*
* This plug-in is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "xcf_p.h"
#include <stdlib.h>
#include <QImage>
#include <QPainter>
#include <QIODevice>
#include <QStack>
#include <QVector>
#include <QDebug>
#include <string.h>
#include "gimp_p.h"
const float INCHESPERMETER = (100.0f / 2.54f);
/*!
* Each layer in an XCF file is stored as a matrix of
* 64-pixel by 64-pixel images. The GIMP has a sophisticated
* method of handling very large images as well as implementing
* parallel processing on a tile-by-tile basis. Here, though,
* we just read them in en-masse and store them in a matrix.
*/
typedef QVector<QVector<QImage> > Tiles;
class XCFImageFormat
{
public:
XCFImageFormat();
bool readXCF(QIODevice *device, QImage *image);
private:
/*!
* Each GIMP image is composed of one or more layers. A layer can
* be one of any three basic types: RGB, grayscale or indexed. With an
* optional alpha channel, there are six possible types altogether.
*
* Note: there is only ever one instance of this structure. The
* layer info is discarded after it is merged into the final QImage.
*/
class Layer
{
public:
quint32 width; //!< Width of the layer
quint32 height; //!< Height of the layer
qint32 type; //!< Type of the layer (GimpImageType)
char *name; //!< Name of the layer
quint32 hierarchy_offset; //!< File position of Tile hierarchy
quint32 mask_offset; //!< File position of mask image
uint nrows; //!< Number of rows of tiles (y direction)
uint ncols; //!< Number of columns of tiles (x direction)
Tiles image_tiles; //!< The basic image
//! For Grayscale and Indexed images, the alpha channel is stored
//! separately (in this data structure, anyway).
Tiles alpha_tiles;
Tiles mask_tiles; //!< The layer mask (optional)
//! Additional information about a layer mask.
struct {
quint32 opacity;
quint32 visible;
quint32 show_masked;
uchar red, green, blue;
quint32 tattoo;
} mask_channel;
bool active; //!< Is this layer the active layer?
quint32 opacity = 255; //!< The opacity of the layer
quint32 visible = 1; //!< Is the layer visible?
quint32 linked; //!< Is this layer linked (geometrically)
quint32 preserve_transparency; //!< Preserve alpha when drawing on layer?
quint32 apply_mask = 9; //!< Apply the layer mask? Use 9 as "uninitilized". Spec says "If the property does not appear for a layer which has a layer mask, it defaults to true (1).
// Robust readers should force this to false if the layer has no layer mask.
quint32 edit_mask; //!< Is the layer mask the being edited?
quint32 show_mask; //!< Show the layer mask rather than the image?
qint32 x_offset = 0; //!< x offset of the layer relative to the image
qint32 y_offset = 0; //!< y offset of the layer relative to the image
quint32 mode = 0; //!< Combining mode of layer (LayerModeEffects)
quint32 tattoo; //!< (unique identifier?)
//! As each tile is read from the file, it is buffered here.
uchar tile[TILE_WIDTH *TILE_HEIGHT *sizeof(QRgb)];
//! The data from tile buffer is copied to the Tile by this
//! method. Depending on the type of the tile (RGB, Grayscale,
//! Indexed) and use (image or mask), the bytes in the buffer are
//! copied in different ways.
void (*assignBytes)(Layer &layer, uint i, uint j);
Layer(void) : name(nullptr) {}
~Layer(void)
{
delete[] name;
}
Layer(const Layer &) = delete;
Layer &operator=(const Layer &) = delete;
};
/*!
* The in-memory representation of the XCF Image. It contains a few
* metadata items, but is mostly a container for the layer information.
*/
class XCFImage
{
public:
quint32 width; //!< width of the XCF image
quint32 height; //!< height of the XCF image
qint32 type; //!< type of the XCF image (GimpImageBaseType)
quint8 compression; //!< tile compression method (CompressionType)
float x_resolution = -1;//!< x resolution in dots per inch
float y_resolution = -1;//!< y resolution in dots per inch
qint32 tattoo; //!< (unique identifier?)
quint32 unit; //!< Units of The GIMP (inch, mm, pica, etc...)
qint32 num_colors = 0; //!< number of colors in an indexed image
QVector<QRgb> palette; //!< indexed image color palette
int num_layers; //!< number of layers
Layer layer; //!< most recently read layer
bool initialized; //!< Is the QImage initialized?
QImage image; //!< final QImage
XCFImage(void) : initialized(false) {}
};
//! In layer DISSOLVE mode, a random number is chosen to compare to a
//! pixel's alpha. If the alpha is greater than the random number, the
//! pixel is drawn. This table merely contains the random number seeds
//! for each ROW of an image. Therefore, the random numbers chosen
//! are consistent from run to run.
static int random_table[RANDOM_TABLE_SIZE];
static bool random_table_initialized;
//! This table is used as a shared grayscale ramp to be set on grayscale
//! images. This is because Qt does not differentiate between indexed and
//! grayscale images.
static QVector<QRgb> grayTable;
//! This table provides the add_pixel saturation values (i.e. 250 + 250 = 255).
//static int add_lut[256][256]; - this is so lame waste of 256k of memory
static int add_lut(int, int);
//! The bottom-most layer is copied into the final QImage by this
//! routine.
typedef void (*PixelCopyOperation)(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
//! Higher layers are merged into the final QImage by this routine.
typedef void (*PixelMergeOperation)(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
//! Layer mode static data.
typedef struct {
bool affect_alpha; //!< Does this mode affect the source alpha?
} LayerModes;
//! Array of layer mode structures for the modes described by
//! LayerModeEffects.
static const LayerModes layer_modes[];
bool loadImageProperties(QDataStream &xcf_io, XCFImage &image);
bool loadProperty(QDataStream &xcf_io, PropType &type, QByteArray &bytes, quint32 &rawType);
bool loadLayer(QDataStream &xcf_io, XCFImage &xcf_image);
bool loadLayerProperties(QDataStream &xcf_io, Layer &layer);
bool composeTiles(XCFImage &xcf_image);
void setGrayPalette(QImage &image);
void setPalette(XCFImage &xcf_image, QImage &image);
static void assignImageBytes(Layer &layer, uint i, uint j);
bool loadHierarchy(QDataStream &xcf_io, Layer &layer);
bool loadLevel(QDataStream &xcf_io, Layer &layer, qint32 bpp);
static void assignMaskBytes(Layer &layer, uint i, uint j);
bool loadMask(QDataStream &xcf_io, Layer &layer);
bool loadChannelProperties(QDataStream &xcf_io, Layer &layer);
bool initializeImage(XCFImage &xcf_image);
bool loadTileRLE(QDataStream &xcf_io, uchar *tile, int size,
int data_length, qint32 bpp);
static void copyLayerToImage(XCFImage &xcf_image);
static void copyRGBToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyGrayToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyGrayToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyGrayAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyIndexedToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyIndexedAToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void copyIndexedAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeLayerIntoImage(XCFImage &xcf_image);
static void mergeRGBToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeGrayToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeGrayAToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeGrayToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeGrayAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeIndexedToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeIndexedAToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void mergeIndexedAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n);
static void initializeRandomTable();
static void dissolveRGBPixels(QImage &image, int x, int y);
static void dissolveAlphaPixels(QImage &image, int x, int y);
};
int XCFImageFormat::random_table[RANDOM_TABLE_SIZE];
bool XCFImageFormat::random_table_initialized;
QVector<QRgb> XCFImageFormat::grayTable;
template <typename T, size_t N>
constexpr size_t countof(T(&)[N])
{
return N;
}
const XCFImageFormat::LayerModes XCFImageFormat::layer_modes[] = {
{true}, // NORMAL_MODE
{true}, // DISSOLVE_MODE
{true}, // BEHIND_MODE
{false}, // MULTIPLY_MODE
{false}, // SCREEN_MODE
{false}, // OVERLAY_MODE
{false}, // DIFFERENCE_MODE
{false}, // ADDITION_MODE
{false}, // SUBTRACT_MODE
{false}, // DARKEN_ONLY_MODE
{false}, // LIGHTEN_ONLY_MODE
{false}, // HUE_MODE
{false}, // SATURATION_MODE
{false}, // COLOR_MODE
{false}, // VALUE_MODE
{false}, // DIVIDE_MODE
{false}, // DODGE_MODE
{false}, // BURN_MODE
{false}, // HARDLIGHT_MODE
{false}, // SOFTLIGHT_MODE
{false}, // GRAIN_EXTRACT_MODE
{false}, // GRAIN_MERGE_MODE
};
//! Change a QRgb value's alpha only.
inline QRgb qRgba(const QRgb rgb, int a)
{
return ((a & 0xff) << 24 | (rgb & RGB_MASK));
}
/*!
* The constructor for the XCF image loader.
*/
XCFImageFormat::XCFImageFormat()
{
}
/*!
* This initializes the tables used in the layer dissolving routines.
*/
void XCFImageFormat::initializeRandomTable()
{
// From GIMP "paint_funcs.c" v1.2
srand(RANDOM_SEED);
for (int i = 0; i < RANDOM_TABLE_SIZE; i++) {
random_table[i] = rand();
}
for (int i = 0; i < RANDOM_TABLE_SIZE; i++) {
int tmp;
int swap = i + rand() % (RANDOM_TABLE_SIZE - i);
tmp = random_table[i];
random_table[i] = random_table[swap];
random_table[swap] = tmp;
}
}
inline
int XCFImageFormat::add_lut(int a, int b)
{
return qMin(a + b, 255);
}
bool XCFImageFormat::readXCF(QIODevice *device, QImage *outImage)
{
XCFImage xcf_image;
QDataStream xcf_io(device);
char tag[14];;
if (xcf_io.readRawData(tag, sizeof(tag)) != sizeof(tag)) {
// qDebug() << "XCF: read failure on header tag";
return false;
}
if (qstrncmp(tag, "gimp xcf", 8) != 0) {
// qDebug() << "XCF: read called on non-XCF file";
return false;
}
xcf_io >> xcf_image.width >> xcf_image.height >> xcf_image.type;
// qDebug() << tag << " " << xcf_image.width << " " << xcf_image.height << " " << xcf_image.type;
if (!loadImageProperties(xcf_io, xcf_image)) {
return false;
}
// The layers appear to be stored in top-to-bottom order. This is
// the reverse of how a merged image must be computed. So, the layer
// offsets are pushed onto a LIFO stack (thus, we don't have to load
// all the data of all layers before beginning to construct the
// merged image).
QStack<qint32> layer_offsets;
while (true) {
qint32 layer_offset;
xcf_io >> layer_offset;
if (layer_offset == 0) {
break;
}
layer_offsets.push(layer_offset);
}
xcf_image.num_layers = layer_offsets.size();
if (layer_offsets.size() == 0) {
// qDebug() << "XCF: no layers!"; return false;
}
// Load each layer and add it to the image
while (!layer_offsets.isEmpty()) {
qint32 layer_offset = layer_offsets.pop();
xcf_io.device()->seek(layer_offset);
if (!loadLayer(xcf_io, xcf_image)) {
return false;
}
}
if (!xcf_image.initialized) {
// qDebug() << "XCF: no visible layers!";
return false;
}
*outImage = xcf_image.image;
return true;
}
/*!
* An XCF file can contain an arbitrary number of properties associated
* with the image (and layer and mask).
* \param xcf_io the data stream connected to the XCF image
* \param xcf_image XCF image data.
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadImageProperties(QDataStream &xcf_io, XCFImage &xcf_image)
{
while (true) {
PropType type;
QByteArray bytes;
quint32 rawType;
if (!loadProperty(xcf_io, type, bytes, rawType)) {
// qDebug() << "XCF: error loading global image properties";
return false;
}
QDataStream property(bytes);
switch (type) {
case PROP_END:
return true;
case PROP_COMPRESSION:
property >> xcf_image.compression;
break;
case PROP_RESOLUTION:
property >> xcf_image.x_resolution >> xcf_image.y_resolution;
break;
case PROP_TATTOO:
property >> xcf_image.tattoo;
break;
case PROP_PARASITES:
while (!property.atEnd()) {
char *tag;
quint32 size;
property.readBytes(tag, size);
quint32 flags;
char *data = nullptr;
property >> flags >> data;
if (tag && strncmp(tag, "gimp-comment", strlen("gimp-comment")) == 0) {
xcf_image.image.setText(QStringLiteral("Comment"), QString::fromUtf8(data));
}
delete[] tag;
delete[] data;
}
break;
case PROP_UNIT:
property >> xcf_image.unit;
break;
case PROP_PATHS: // This property is ignored.
break;
case PROP_USER_UNIT: // This property is ignored.
break;
case PROP_COLORMAP:
property >> xcf_image.num_colors;
if (xcf_image.num_colors < 0 || xcf_image.num_colors > 65535) {
return false;
}
xcf_image.palette = QVector<QRgb>();
xcf_image.palette.reserve(xcf_image.num_colors);
for (int i = 0; i < xcf_image.num_colors; i++) {
uchar r, g, b;
property >> r >> g >> b;
xcf_image.palette.push_back(qRgb(r, g, b));
}
break;
default:
// qDebug() << "XCF: unimplemented image property" << rawType
// << ", size " << bytes.size() << endl;
break;
}
}
}
/*!
* Read a single property from the image file. The property type is returned
* in type and the data is returned in bytes.
* \param xcf the image file data stream.
* \param type returns with the property type.
* \param bytes returns with the property data.
* \return true if there were no IO errors. */
bool XCFImageFormat::loadProperty(QDataStream &xcf_io, PropType &type, QByteArray &bytes, quint32 &rawType)
{
xcf_io >> rawType;
if (rawType >= MAX_SUPPORTED_PROPTYPE) {
type = MAX_SUPPORTED_PROPTYPE;
// return true because we don't really want to totally fail on an unsupported property since it may not be fatal
return true;
}
type = PropType(rawType);
char *data = nullptr;
quint32 size;
// The colormap property size is not the correct number of bytes:
// The GIMP source xcf.c has size = 4 + ncolors, but it should be
// 4 + 3 * ncolors
if (type == PROP_COLORMAP) {
xcf_io >> size;
quint32 ncolors;
xcf_io >> ncolors;
size = 3 * ncolors + 4;
if (size > 65535 || size < 4) {
return false;
}
data = new char[size];
// since we already read "ncolors" from the stream, we put that data back
data[0] = 0;
data[1] = 0;
data[2] = ncolors >> 8;
data[3] = ncolors & 255;
// ... and read the remaining bytes from the stream
xcf_io.readRawData(data + 4, size - 4);
} else if (type == PROP_USER_UNIT) {
// The USER UNIT property size is not correct. I'm not sure why, though.
float factor;
qint32 digits;
xcf_io >> size >> factor >> digits;
for (int i = 0; i < 5; i++) {
char *unit_strings;
xcf_io >> unit_strings;
delete[] unit_strings;
if (xcf_io.device()->atEnd()) {
// qDebug() << "XCF: read failure on property " << type;
return false;
}
}
size = 0;
} else {
xcf_io >> size;
if (size > 256000) {
return false;
}
data = new char[size];
const quint32 dataRead = xcf_io.readRawData(data, size);
if (dataRead < size) {
// qDebug() << "XCF: loadProperty read less data than expected" << data_length << dataRead;
memset(&data[dataRead], 0, size - dataRead);
}
}
if (size != 0 && data) {
bytes = QByteArray(data, size);
}
delete [] data;
return true;
}
/*!
* Load a layer from the XCF file. The data stream must be positioned at
* the beginning of the layer data.
* \param xcf_io the image file data stream.
* \param xcf_image contains the layer and the color table
* (if the image is indexed).
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadLayer(QDataStream &xcf_io, XCFImage &xcf_image)
{
Layer &layer(xcf_image.layer);
delete[] layer.name;
xcf_io >> layer.width >> layer.height >> layer.type >> layer.name;
if (!loadLayerProperties(xcf_io, layer)) {
return false;
}
#if 0
cout << "layer: \"" << layer.name << "\", size: " << layer.width << " x "
<< layer.height << ", type: " << layer.type << ", mode: " << layer.mode
<< ", opacity: " << layer.opacity << ", visible: " << layer.visible
<< ", offset: " << layer.x_offset << ", " << layer.y_offset << endl;
#endif
// Skip reading the rest of it if it is not visible. Typically, when
// you export an image from the The GIMP it flattens (or merges) only
// the visible layers into the output image.
if (layer.visible == 0) {
return true;
}
// If there are any more layers, merge them into the final QImage.
xcf_io >> layer.hierarchy_offset >> layer.mask_offset;
// Allocate the individual tile QImages based on the size and type
// of this layer.
if (!composeTiles(xcf_image)) {
return false;
}
xcf_io.device()->seek(layer.hierarchy_offset);
// As tiles are loaded, they are copied into the layers tiles by
// this routine. (loadMask(), below, uses a slightly different
// version of assignBytes().)
layer.assignBytes = assignImageBytes;
if (!loadHierarchy(xcf_io, layer)) {
return false;
}
if (layer.mask_offset != 0) {
// 9 means its not on the file. Spec says "If the property does not appear for a layer which has a layer mask, it defaults to true (1).
if (layer.apply_mask == 9) {
layer.apply_mask = 1;
}
xcf_io.device()->seek(layer.mask_offset);
if (!loadMask(xcf_io, layer)) {
return false;
}
} else {
// Spec says "Robust readers should force this to false if the layer has no layer mask."
layer.apply_mask = 0;
}
// Now we should have enough information to initialize the final
// QImage. The first visible layer determines the attributes
// of the QImage.
if (!xcf_image.initialized) {
if (!initializeImage(xcf_image)) {
return false;
}
copyLayerToImage(xcf_image);
xcf_image.initialized = true;
} else {
mergeLayerIntoImage(xcf_image);
}
return true;
}
/*!
* An XCF file can contain an arbitrary number of properties associated
* with a layer.
* \param xcf_io the data stream connected to the XCF image.
* \param layer layer to collect the properties.
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadLayerProperties(QDataStream &xcf_io, Layer &layer)
{
while (true) {
PropType type;
QByteArray bytes;
quint32 rawType;
if (!loadProperty(xcf_io, type, bytes, rawType)) {
// qDebug() << "XCF: error loading layer properties";
return false;
}
QDataStream property(bytes);
switch (type) {
case PROP_END:
return true;
case PROP_ACTIVE_LAYER:
layer.active = true;
break;
case PROP_OPACITY:
property >> layer.opacity;
layer.opacity = std::min(layer.opacity, 255u);
break;
case PROP_VISIBLE:
property >> layer.visible;
break;
case PROP_LINKED:
property >> layer.linked;
break;
case PROP_PRESERVE_TRANSPARENCY:
property >> layer.preserve_transparency;
break;
case PROP_APPLY_MASK:
property >> layer.apply_mask;
break;
case PROP_EDIT_MASK:
property >> layer.edit_mask;
break;
case PROP_SHOW_MASK:
property >> layer.show_mask;
break;
case PROP_OFFSETS:
property >> layer.x_offset >> layer.y_offset;
break;
case PROP_MODE:
property >> layer.mode;
if (layer.mode >= countof(layer_modes)) {
qWarning() << "Found layer with unsupported mode" << layer.mode << "Defaulting to mode 0";
layer.mode = 0;
}
break;
case PROP_TATTOO:
property >> layer.tattoo;
break;
default:
// qDebug() << "XCF: unimplemented layer property " << rawType
// << ", size " << bytes.size() << endl;
break;
}
}
}
/*!
* Compute the number of tiles in the current layer and allocate
* QImage structures for each of them.
* \param xcf_image contains the current layer.
*/
bool XCFImageFormat::composeTiles(XCFImage &xcf_image)
{
Layer &layer(xcf_image.layer);
layer.nrows = (layer.height + TILE_HEIGHT - 1) / TILE_HEIGHT;
layer.ncols = (layer.width + TILE_WIDTH - 1) / TILE_WIDTH;
//qDebug() << "IMAGE: height=" << xcf_image.height << ", width=" << xcf_image.width;
//qDebug() << "LAYER: height=" << layer.height << ", width=" << layer.width;
//qDebug() << "LAYER: rows=" << layer.nrows << ", columns=" << layer.ncols;
// SANITY CHECK: Catch corrupted XCF image file where the width or height
// of a tile is reported are bogus. See Bug# 234030.
if (layer.width > 32767 || layer.height > 32767
|| (sizeof(void *) == 4 && layer.width * layer.height > 16384 * 16384)) {
return false;
}
layer.image_tiles.resize(layer.nrows);
if (layer.type == GRAYA_GIMAGE || layer.type == INDEXEDA_GIMAGE) {
layer.alpha_tiles.resize(layer.nrows);
}
if (layer.mask_offset != 0) {
layer.mask_tiles.resize(layer.nrows);
}
for (uint j = 0; j < layer.nrows; j++) {
layer.image_tiles[j].resize(layer.ncols);
if (layer.type == GRAYA_GIMAGE || layer.type == INDEXEDA_GIMAGE) {
layer.alpha_tiles[j].resize(layer.ncols);
}
if (layer.mask_offset != 0) {
layer.mask_tiles[j].resize(layer.ncols);
}
}
for (uint j = 0; j < layer.nrows; j++) {
for (uint i = 0; i < layer.ncols; i++) {
uint tile_width = (i + 1) * TILE_WIDTH <= layer.width
? TILE_WIDTH : layer.width - i * TILE_WIDTH;
uint tile_height = (j + 1) * TILE_HEIGHT <= layer.height
? TILE_HEIGHT : layer.height - j * TILE_HEIGHT;
// Try to create the most appropriate QImage (each GIMP layer
// type is treated slightly differently)
switch (layer.type) {
case RGB_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_RGB32);
layer.image_tiles[j][i].setColorCount(0);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
break;
case RGBA_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_ARGB32);
layer.image_tiles[j][i].setColorCount(0);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
break;
case GRAY_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.image_tiles[j][i].setColorCount(256);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
setGrayPalette(layer.image_tiles[j][i]);
break;
case GRAYA_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.image_tiles[j][i].setColorCount(256);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
setGrayPalette(layer.image_tiles[j][i]);
layer.alpha_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.alpha_tiles[j][i].setColorCount(256);
if (layer.alpha_tiles[j][i].isNull()) {
return false;
}
setGrayPalette(layer.alpha_tiles[j][i]);
break;
case INDEXED_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.image_tiles[j][i].setColorCount(xcf_image.num_colors);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
setPalette(xcf_image, layer.image_tiles[j][i]);
break;
case INDEXEDA_GIMAGE:
layer.image_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.image_tiles[j][i].setColorCount(xcf_image.num_colors);
if (layer.image_tiles[j][i].isNull()) {
return false;
}
setPalette(xcf_image, layer.image_tiles[j][i]);
layer.alpha_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.alpha_tiles[j][i].setColorCount(256);
if (layer.alpha_tiles[j][i].isNull()) {
return false;
}
setGrayPalette(layer.alpha_tiles[j][i]);
}
if (layer.mask_offset != 0) {
layer.mask_tiles[j][i] = QImage(tile_width, tile_height, QImage::Format_Indexed8);
layer.mask_tiles[j][i].setColorCount(256);
if (layer.mask_tiles[j][i].isNull()) {
return false;
}
setGrayPalette(layer.mask_tiles[j][i]);
}
}
}
return true;
}
/*!
* Apply a grayscale palette to the QImage. Note that Qt does not distinguish
* between grayscale and indexed images. A grayscale image is just
* an indexed image with a 256-color, grayscale palette.
* \param image image to set to a grayscale palette.
*/
void XCFImageFormat::setGrayPalette(QImage &image)
{
if (grayTable.isEmpty()) {
grayTable.resize(256);
for (int i = 0; i < 256; i++) {
grayTable[i] = qRgb(i, i, i);
}
}
image.setColorTable(grayTable);
}
/*!
* Copy the indexed palette from the XCF image into the QImage.
* \param xcf_image XCF image containing the palette read from the data stream.
* \param image image to apply the palette to.
*/
void XCFImageFormat::setPalette(XCFImage &xcf_image, QImage &image)
{
Q_ASSERT(xcf_image.num_colors == xcf_image.palette.size());
image.setColorTable(xcf_image.palette);
}
/*!
* Copy the bytes from the tile buffer into the image tile QImage, taking into
* account all the myriad different modes.
* \param layer layer containing the tile buffer and the image tile matrix.
* \param i column index of current tile.
* \param j row index of current tile.
*/
void XCFImageFormat::assignImageBytes(Layer &layer, uint i, uint j)
{
QImage &image = layer.image_tiles[j][i];
const uchar *tile = layer.tile;
const int width = image.width();
const int height = image.height();
const int bytesPerLine = image.bytesPerLine();
uchar *bits = image.bits();
switch (layer.type) {
case RGB_GIMAGE:
for (int y = 0; y < height; y++) {
QRgb *dataPtr = (QRgb *)(bits + y * bytesPerLine);
for (int x = 0; x < width; x++) {
*dataPtr++ = qRgb(tile[0], tile[1], tile[2]);
tile += sizeof(QRgb);
}
}
break;
case RGBA_GIMAGE:
for (int y = 0; y < height; y++) {
QRgb *dataPtr = (QRgb *)(bits + y * bytesPerLine);
for (int x = 0; x < width; x++) {
*dataPtr++ = qRgba(tile[0], tile[1], tile[2], tile[3]);
tile += sizeof(QRgb);
}
}
break;
case GRAY_GIMAGE:
case INDEXED_GIMAGE:
for (int y = 0; y < height; y++) {
uchar *dataPtr = bits + y * bytesPerLine;
for (int x = 0; x < width; x++) {
*dataPtr++ = tile[0];
tile += sizeof(QRgb);
}
}
break;
case GRAYA_GIMAGE:
case INDEXEDA_GIMAGE:
for (int y = 0; y < height; y++) {
uchar *dataPtr = bits + y * bytesPerLine;
uchar *alphaPtr = layer.alpha_tiles[j][i].scanLine(y);
for (int x = 0; x < width; x++) {
// The "if" here should not be necessary, but apparently there
// are some cases where the image can contain larger indices
// than there are colors in the palette. (A bug in The GIMP?)
if (tile[0] < image.colorCount()) {
*dataPtr = tile[0];
}
*alphaPtr = tile[1];
dataPtr += 1;
alphaPtr += 1;
tile += sizeof(QRgb);
}
}
break;
}
}
/*!
* The GIMP stores images in a "mipmap"-like hierarchy. As far as the QImage
* is concerned, however, only the top level (i.e., the full resolution image)
* is used.
* \param xcf_io the data stream connected to the XCF image.
* \param layer the layer to collect the image.
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadHierarchy(QDataStream &xcf_io, Layer &layer)
{
qint32 width;
qint32 height;
qint32 bpp;
quint32 offset;
xcf_io >> width >> height >> bpp >> offset;
// make sure bpp is correct and complain if it is not
switch (layer.type) {
case RGB_GIMAGE:
if (bpp != 3) {
qWarning() << "Found layer of type RGB but with bpp != 3" << bpp;
bpp = 3;
}
break;
case RGBA_GIMAGE:
if (bpp != 4) {
qWarning() << "Found layer of type RGBA but with bpp != 4" << bpp;
bpp = 4;
}
break;
case GRAY_GIMAGE:
if (bpp != 1) {
qWarning() << "Found layer of type Gray but with bpp != 1" << bpp;
bpp = 1;
}
break;
case GRAYA_GIMAGE:
if (bpp != 2) {
qWarning() << "Found layer of type Gray+Alpha but with bpp != 2" << bpp;
bpp = 2;
}
break;
case INDEXED_GIMAGE:
if (bpp != 1) {
qWarning() << "Found layer of type Indexed but with bpp != 1" << bpp;
bpp = 1;
}
break;
case INDEXEDA_GIMAGE:
if (bpp != 2) {
qWarning() << "Found layer of type Indexed+Alpha but with bpp != 2" << bpp;
bpp = 2;
}
break;
}
// GIMP stores images in a "mipmap"-like format (multiple levels of
// increasingly lower resolution). Only the top level is used here,
// however.
quint32 junk;
do {
xcf_io >> junk;
if (xcf_io.device()->atEnd()) {
// qDebug() << "XCF: read failure on layer " << layer.name << " level offsets";
return false;
}
} while (junk != 0);
qint64 saved_pos = xcf_io.device()->pos();
xcf_io.device()->seek(offset);
if (!loadLevel(xcf_io, layer, bpp)) {
return false;
}
xcf_io.device()->seek(saved_pos);
return true;
}
/*!
* Load one level of the image hierarchy (but only the top level is ever used).
* \param xcf_io the data stream connected to the XCF image.
* \param layer the layer to collect the image.
* \param bpp the number of bytes in a pixel.
* \return true if there were no I/O errors.
* \sa loadTileRLE().
*/
bool XCFImageFormat::loadLevel(QDataStream &xcf_io, Layer &layer, qint32 bpp)
{
qint32 width;
qint32 height;
quint32 offset;
xcf_io >> width >> height >> offset;
if (offset == 0) {
// offset 0 with rowsxcols != 0 is probably an error since it means we have tiles
// without data but just clear the bits for now instead of returning false
for (uint j = 0; j < layer.nrows; j++) {
for (uint i = 0; i < layer.ncols; i++) {
layer.image_tiles[j][i].fill(Qt::transparent);
}
}
return true;
}
for (uint j = 0; j < layer.nrows; j++) {
for (uint i = 0; i < layer.ncols; i++) {
if (offset == 0) {
// qDebug() << "XCF: incorrect number of tiles in layer " << layer.name;
return false;
}
qint64 saved_pos = xcf_io.device()->pos();
quint32 offset2;
xcf_io >> offset2;
// Evidently, RLE can occasionally expand a tile instead of compressing it!
if (offset2 == 0) {
offset2 = offset + (uint)(TILE_WIDTH * TILE_HEIGHT * 4 * 1.5);
}
xcf_io.device()->seek(offset);
int size = layer.image_tiles[j][i].width() * layer.image_tiles[j][i].height();
if (!loadTileRLE(xcf_io, layer.tile, size, offset2 - offset, bpp)) {
return false;
}
// The bytes in the layer tile are juggled differently depending on
// the target QImage. The caller has set layer.assignBytes to the
// appropriate routine.
layer.assignBytes(layer, i, j);
xcf_io.device()->seek(saved_pos);
xcf_io >> offset;
}
}
return true;
}
/*!
* A layer can have a one channel image which is used as a mask.
* \param xcf_io the data stream connected to the XCF image.
* \param layer the layer to collect the mask image.
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadMask(QDataStream &xcf_io, Layer &layer)
{
qint32 width;
qint32 height;
char *name;
xcf_io >> width >> height >> name;
delete name;
if (!loadChannelProperties(xcf_io, layer)) {
return false;
}
quint32 hierarchy_offset;
xcf_io >> hierarchy_offset;
xcf_io.device()->seek(hierarchy_offset);
layer.assignBytes = assignMaskBytes;
if (!loadHierarchy(xcf_io, layer)) {
return false;
}
return true;
}
/*!
* This is the routine for which all the other code is simply
* infrastructure. Read the image bytes out of the file and
* store them in the tile buffer. This is passed a full 32-bit deep
* buffer, even if bpp is smaller. The caller can figure out what to
* do with the bytes.
*
* The tile is stored in "channels", i.e. the red component of all
* pixels, then the green component of all pixels, then blue then
* alpha, or, for indexed images, the color indices of all pixels then
* the alpha of all pixels.
*
* The data is compressed with "run length encoding". Some simple data
* integrity checks are made.
*
* \param xcf_io the data stream connected to the XCF image.
* \param tile the buffer to expand the RLE into.
* \param image_size number of bytes expected to be in the image tile.
* \param data_length number of bytes expected in the RLE.
* \param bpp number of bytes per pixel.
* \return true if there were no I/O errors and no obvious corruption of
* the RLE data.
*/
bool XCFImageFormat::loadTileRLE(QDataStream &xcf_io, uchar *tile, int image_size,
int data_length, qint32 bpp)
{
uchar *data;
uchar *xcfdata;
uchar *xcfodata;
uchar *xcfdatalimit;
if (data_length < 0 || data_length > int(TILE_WIDTH * TILE_HEIGHT * 4 * 1.5)) {
// qDebug() << "XCF: invalid tile data length" << data_length;
return false;
}
xcfdata = xcfodata = new uchar[data_length];
const int dataRead = xcf_io.readRawData((char *)xcfdata, data_length);
if (dataRead < data_length) {
// qDebug() << "XCF: read less data than expected" << data_length << dataRead;
memset(&xcfdata[dataRead], 0, data_length - dataRead);
}
if (!xcf_io.device()->isOpen()) {
delete[] xcfodata;
// qDebug() << "XCF: read failure on tile";
return false;
}
xcfdatalimit = &xcfodata[data_length - 1];
for (int i = 0; i < bpp; ++i) {
data = tile + i;
int count = 0;
int size = image_size;
while (size > 0) {
if (xcfdata > xcfdatalimit) {
goto bogus_rle;
}
uchar val = *xcfdata++;
uint length = val;
if (length >= 128) {
length = 255 - (length - 1);
if (length == 128) {
if (xcfdata >= xcfdatalimit) {
goto bogus_rle;
}
length = (*xcfdata << 8) + xcfdata[1];
xcfdata += 2;
}
count += length;
size -= length;
if (size < 0) {
goto bogus_rle;
}
if (&xcfdata[length - 1] > xcfdatalimit) {
goto bogus_rle;
}
while (length-- > 0) {
*data = *xcfdata++;
data += sizeof(QRgb);
}
} else {
length += 1;
if (length == 128) {
if (xcfdata >= xcfdatalimit) {
goto bogus_rle;
}
length = (*xcfdata << 8) + xcfdata[1];
xcfdata += 2;
}
count += length;
size -= length;
if (size < 0) {
goto bogus_rle;
}
if (xcfdata > xcfdatalimit) {
goto bogus_rle;
}
val = *xcfdata++;
while (length-- > 0) {
*data = val;
data += sizeof(QRgb);
}
}
}
}
delete[] xcfodata;
return true;
bogus_rle:
// qDebug() << "The run length encoding could not be decoded properly";
delete[] xcfodata;
return false;
}
/*!
* An XCF file can contain an arbitrary number of properties associated
* with a channel. Note that this routine only reads mask channel properties.
* \param xcf_io the data stream connected to the XCF image.
* \param layer layer containing the mask channel to collect the properties.
* \return true if there were no I/O errors.
*/
bool XCFImageFormat::loadChannelProperties(QDataStream &xcf_io, Layer &layer)
{
while (true) {
PropType type;
QByteArray bytes;
quint32 rawType;
if (!loadProperty(xcf_io, type, bytes, rawType)) {
// qDebug() << "XCF: error loading channel properties";
return false;
}
QDataStream property(bytes);
switch (type) {
case PROP_END:
return true;
case PROP_OPACITY:
property >> layer.mask_channel.opacity;
layer.mask_channel.opacity = std::min(layer.mask_channel.opacity, 255u);
break;
case PROP_VISIBLE:
property >> layer.mask_channel.visible;
break;
case PROP_SHOW_MASKED:
property >> layer.mask_channel.show_masked;
break;
case PROP_COLOR:
property >> layer.mask_channel.red >> layer.mask_channel.green
>> layer.mask_channel.blue;
break;
case PROP_TATTOO:
property >> layer.mask_channel.tattoo;
break;
default:
// qDebug() << "XCF: unimplemented channel property " << rawType
// << ", size " << bytes.size() << endl;
break;
}
}
}
/*!
* Copy the bytes from the tile buffer into the mask tile QImage.
* \param layer layer containing the tile buffer and the mask tile matrix.
* \param i column index of current tile.
* \param j row index of current tile.
*/
void XCFImageFormat::assignMaskBytes(Layer &layer, uint i, uint j)
{
QImage &image = layer.mask_tiles[j][i];
uchar *tile = layer.tile;
const int width = image.width();
const int height = image.height();
const int bytesPerLine = image.bytesPerLine();
uchar *bits = image.bits();
for (int y = 0; y < height; y++) {
uchar *dataPtr = bits + y * bytesPerLine;
for (int x = 0; x < width; x++) {
*dataPtr++ = tile[0];
tile += sizeof(QRgb);
}
}
}
/*!
* Construct the QImage which will eventually be returned to the QImage
* loader.
*
* There are a couple of situations which require that the QImage is not
* exactly the same as The GIMP's representation. The full table is:
* \verbatim
* Grayscale opaque : 8 bpp indexed
* Grayscale translucent : 32 bpp + alpha
* Indexed opaque : 1 bpp if num_colors <= 2
* : 8 bpp indexed otherwise
* Indexed translucent : 8 bpp indexed + alpha if num_colors < 256
* : 32 bpp + alpha otherwise
* RGB opaque : 32 bpp
* RGBA translucent : 32 bpp + alpha
* \endverbatim
* Whether the image is translucent or not is determined by the bottom layer's
* alpha channel. However, even if the bottom layer lacks an alpha channel,
* it can still have an opacity < 1. In this case, the QImage is promoted
* to 32-bit. (Note this is different from the output from the GIMP image
* exporter, which seems to ignore this attribute.)
*
* Independently, higher layers can be translucent, but the background of
* the image will not show through if the bottom layer is opaque.
*
* For indexed images, translucency is an all or nothing effect.
* \param xcf_image contains image info and bottom-most layer.
*/
bool XCFImageFormat::initializeImage(XCFImage &xcf_image)
{
// (Aliases to make the code look a little better.)
Layer &layer(xcf_image.layer);
QImage &image(xcf_image.image);
switch (layer.type) {
case RGB_GIMAGE:
if (layer.opacity == OPAQUE_OPACITY) {
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_RGB32);
if (image.isNull()) {
return false;
}
image.fill(qRgb(255, 255, 255));
break;
} // else, fall through to 32-bit representation
Q_FALLTHROUGH();
case RGBA_GIMAGE:
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
if (image.isNull()) {
return false;
}
image.fill(qRgba(255, 255, 255, 0));
break;
case GRAY_GIMAGE:
if (layer.opacity == OPAQUE_OPACITY) {
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
image.setColorCount(256);
if (image.isNull()) {
return false;
}
setGrayPalette(image);
image.fill(255);
break;
} // else, fall through to 32-bit representation
Q_FALLTHROUGH();
case GRAYA_GIMAGE:
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
if (image.isNull()) {
return false;
}
image.fill(qRgba(255, 255, 255, 0));
break;
case INDEXED_GIMAGE:
// As noted in the table above, there are quite a few combinations
// which are possible with indexed images, depending on the
// presence of transparency (note: not translucency, which is not
// supported by The GIMP for indexed images) and the number of
// individual colors.
// Note: Qt treats a bitmap with a Black and White color palette
// as a mask, so only the "on" bits are drawn, regardless of the
// order color table entries. Otherwise (i.e., at least one of the
// color table entries is not black or white), it obeys the one-
// or two-color palette. Have to ask about this...
if (xcf_image.num_colors <= 2) {
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
image.setColorCount(xcf_image.num_colors);
if (image.isNull()) {
return false;
}
image.fill(0);
setPalette(xcf_image, image);
} else if (xcf_image.num_colors <= 256) {
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
image.setColorCount(xcf_image.num_colors);
if (image.isNull()) {
return false;
}
image.fill(0);
setPalette(xcf_image, image);
}
break;
case INDEXEDA_GIMAGE:
if (xcf_image.num_colors == 1) {
// Plenty(!) of room to add a transparent color
xcf_image.num_colors++;
xcf_image.palette.resize(xcf_image.num_colors);
xcf_image.palette[1] = xcf_image.palette[0];
xcf_image.palette[0] = qRgba(255, 255, 255, 0);
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_MonoLSB);
image.setColorCount(xcf_image.num_colors);
if (image.isNull()) {
return false;
}
image.fill(0);
setPalette(xcf_image, image);
} else if (xcf_image.num_colors < 256) {
// Plenty of room to add a transparent color
xcf_image.num_colors++;
xcf_image.palette.resize(xcf_image.num_colors);
for (int c = xcf_image.num_colors - 1; c >= 1; c--) {
xcf_image.palette[c] = xcf_image.palette[c - 1];
}
xcf_image.palette[0] = qRgba(255, 255, 255, 0);
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_Indexed8);
image.setColorCount(xcf_image.num_colors);
if (image.isNull()) {
return false;
}
image.fill(0);
setPalette(xcf_image, image);
} else {
// No room for a transparent color, so this has to be promoted to
// true color. (There is no equivalent PNG representation output
// from The GIMP as of v1.2.)
image = QImage(xcf_image.width, xcf_image.height, QImage::Format_ARGB32);
if (image.isNull()) {
return false;
}
image.fill(qRgba(255, 255, 255, 0));
}
break;
}
if (xcf_image.x_resolution > 0 && xcf_image.y_resolution > 0) {
const float dpmx = xcf_image.x_resolution * INCHESPERMETER;
if (dpmx > std::numeric_limits<int>::max())
return false;
const float dpmy = xcf_image.y_resolution * INCHESPERMETER;
if (dpmy > std::numeric_limits<int>::max())
return false;
image.setDotsPerMeterX((int)dpmx);
image.setDotsPerMeterY((int)dpmy);
}
return true;
}
/*!
* Copy a layer into an image, taking account of the manifold modes. The
* contents of the image are replaced.
* \param xcf_image contains the layer and image to be replaced.
*/
void XCFImageFormat::copyLayerToImage(XCFImage &xcf_image)
{
Layer &layer(xcf_image.layer);
QImage &image(xcf_image.image);
PixelCopyOperation copy = nullptr;
switch (layer.type) {
case RGB_GIMAGE:
case RGBA_GIMAGE:
copy = copyRGBToRGB;
break;
case GRAY_GIMAGE:
if (layer.opacity == OPAQUE_OPACITY) {
copy = copyGrayToGray;
} else {
copy = copyGrayToRGB;
}
break;
case GRAYA_GIMAGE:
copy = copyGrayAToRGB;
break;
case INDEXED_GIMAGE:
copy = copyIndexedToIndexed;
break;
case INDEXEDA_GIMAGE:
if (xcf_image.image.depth() <= 8) {
copy = copyIndexedAToIndexed;
} else {
copy = copyIndexedAToRGB;
}
}
if (!copy) {
return;
}
// For each tile...
for (uint j = 0; j < layer.nrows; j++) {
uint y = j * TILE_HEIGHT;
for (uint i = 0; i < layer.ncols; i++) {
uint x = i * TILE_WIDTH;
// This seems the best place to apply the dissolve because it
// depends on the global position of each tile's
// pixels. Apparently it's the only mode which can apply to a
// single layer.
if (layer.mode == DISSOLVE_MODE) {
if (!random_table_initialized) {
initializeRandomTable();
random_table_initialized = true;
}
if (layer.type == RGBA_GIMAGE) {
dissolveRGBPixels(layer.image_tiles[j][i], x, y);
}
else if (layer.type == GRAYA_GIMAGE) {
dissolveAlphaPixels(layer.alpha_tiles[j][i], x, y);
}
}
// Shortcut for common case
if (copy == copyRGBToRGB && layer.apply_mask != 1) {
QPainter painter(&image);
painter.setOpacity(layer.opacity / 255.0);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.drawImage(x + layer.x_offset, y + layer.y_offset, layer.image_tiles[j][i]);
continue;
}
for (int l = 0; l < layer.image_tiles[j][i].height(); l++) {
for (int k = 0; k < layer.image_tiles[j][i].width(); k++) {
int m = x + k + layer.x_offset;
int n = y + l + layer.y_offset;
if (m < 0 || m >= image.width() || n < 0 || n >= image.height()) {
continue;
}
(*copy)(layer, i, j, k, l, image, m, n);
}
}
}
}
}
/*!
* Copy an RGB pixel from the layer to the RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyRGBToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.opacity;
if (layer.type == RGBA_GIMAGE) {
src_a = INT_MULT(src_a, qAlpha(src));
}
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Copy a Gray pixel from the layer to the Gray image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyGrayToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = layer.image_tiles[j][i].pixelIndex(k, l);
image.setPixel(m, n, src);
}
/*!
* Copy a Gray pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyGrayToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.opacity;
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Copy a GrayA pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyGrayAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Copy an Indexed pixel from the layer to the Indexed image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyIndexedToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = layer.image_tiles[j][i].pixelIndex(k, l);
image.setPixel(m, n, src);
}
/*!
* Copy an IndexedA pixel from the layer to the Indexed image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyIndexedAToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
uchar src = layer.image_tiles[j][i].pixelIndex(k, l);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
src_a = INT_MULT(src_a, layer.opacity);
if (layer.apply_mask == 1 &&
layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
if (src_a > 127) {
src++;
} else {
src = 0;
}
image.setPixel(m, n, src);
}
/*!
* Copy an IndexedA pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::copyIndexedAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
// This is what appears in the GIMP window
if (src_a <= 127) {
src_a = 0;
} else {
src_a = OPAQUE_OPACITY;
}
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Merge a layer into an image, taking account of the manifold modes.
* \param xcf_image contains the layer and image to merge.
*/
void XCFImageFormat::mergeLayerIntoImage(XCFImage &xcf_image)
{
Layer &layer(xcf_image.layer);
QImage &image(xcf_image.image);
PixelMergeOperation merge = nullptr;
if (!layer.opacity) {
return; // don't bother doing anything
}
switch (layer.type) {
case RGB_GIMAGE:
case RGBA_GIMAGE:
merge = mergeRGBToRGB;
break;
case GRAY_GIMAGE:
if (layer.opacity == OPAQUE_OPACITY) {
merge = mergeGrayToGray;
} else {
merge = mergeGrayToRGB;
}
break;
case GRAYA_GIMAGE:
if (xcf_image.image.depth() <= 8) {
merge = mergeGrayAToGray;
} else {
merge = mergeGrayAToRGB;
}
break;
case INDEXED_GIMAGE:
merge = mergeIndexedToIndexed;
break;
case INDEXEDA_GIMAGE:
if (xcf_image.image.depth() <= 8) {
merge = mergeIndexedAToIndexed;
} else {
merge = mergeIndexedAToRGB;
}
}
if (!merge) {
return;
}
for (uint j = 0; j < layer.nrows; j++) {
uint y = j * TILE_HEIGHT;
for (uint i = 0; i < layer.ncols; i++) {
uint x = i * TILE_WIDTH;
// This seems the best place to apply the dissolve because it
// depends on the global position of each tile's
// pixels. Apparently it's the only mode which can apply to a
// single layer.
if (layer.mode == DISSOLVE_MODE) {
if (!random_table_initialized) {
initializeRandomTable();
random_table_initialized = true;
}
if (layer.type == RGBA_GIMAGE) {
dissolveRGBPixels(layer.image_tiles[j][i], x, y);
}
else if (layer.type == GRAYA_GIMAGE) {
dissolveAlphaPixels(layer.alpha_tiles[j][i], x, y);
}
}
// Shortcut for common case
if (merge == mergeRGBToRGB && layer.apply_mask != 1
&& layer.mode == NORMAL_MODE) {
QPainter painter(&image);
painter.setOpacity(layer.opacity / 255.0);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.drawImage(x + layer.x_offset, y + layer.y_offset, layer.image_tiles[j][i]);
continue;
}
for (int l = 0; l < layer.image_tiles[j][i].height(); l++) {
for (int k = 0; k < layer.image_tiles[j][i].width(); k++) {
int m = x + k + layer.x_offset;
int n = y + l + layer.y_offset;
if (m < 0 || m >= image.width() || n < 0 || n >= image.height()) {
continue;
}
(*merge)(layer, i, j, k, l, image, m, n);
}
}
}
}
}
/*!
* Merge an RGB pixel from the layer to the RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeRGBToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
QRgb dst = image.pixel(m, n);
uchar src_r = qRed(src);
uchar src_g = qGreen(src);
uchar src_b = qBlue(src);
uchar src_a = qAlpha(src);
uchar dst_r = qRed(dst);
uchar dst_g = qGreen(dst);
uchar dst_b = qBlue(dst);
uchar dst_a = qAlpha(dst);
if (!src_a) {
return; // nothing to merge
}
switch (layer.mode) {
case MULTIPLY_MODE: {
src_r = INT_MULT(src_r, dst_r);
src_g = INT_MULT(src_g, dst_g);
src_b = INT_MULT(src_b, dst_b);
src_a = qMin(src_a, dst_a);
}
break;
case DIVIDE_MODE: {
src_r = qMin((dst_r * 256) / (1 + src_r), 255);
src_g = qMin((dst_g * 256) / (1 + src_g), 255);
src_b = qMin((dst_b * 256) / (1 + src_b), 255);
src_a = qMin(src_a, dst_a);
}
break;
case SCREEN_MODE: {
src_r = 255 - INT_MULT(255 - dst_r, 255 - src_r);
src_g = 255 - INT_MULT(255 - dst_g, 255 - src_g);
src_b = 255 - INT_MULT(255 - dst_b, 255 - src_b);
src_a = qMin(src_a, dst_a);
}
break;
case OVERLAY_MODE: {
src_r = INT_MULT(dst_r, dst_r + INT_MULT(2 * src_r, 255 - dst_r));
src_g = INT_MULT(dst_g, dst_g + INT_MULT(2 * src_g, 255 - dst_g));
src_b = INT_MULT(dst_b, dst_b + INT_MULT(2 * src_b, 255 - dst_b));
src_a = qMin(src_a, dst_a);
}
break;
case DIFFERENCE_MODE: {
src_r = dst_r > src_r ? dst_r - src_r : src_r - dst_r;
src_g = dst_g > src_g ? dst_g - src_g : src_g - dst_g;
src_b = dst_b > src_b ? dst_b - src_b : src_b - dst_b;
src_a = qMin(src_a, dst_a);
}
break;
case ADDITION_MODE: {
src_r = add_lut(dst_r, src_r);
src_g = add_lut(dst_g, src_g);
src_b = add_lut(dst_b, src_b);
src_a = qMin(src_a, dst_a);
}
break;
case SUBTRACT_MODE: {
src_r = dst_r > src_r ? dst_r - src_r : 0;
src_g = dst_g > src_g ? dst_g - src_g : 0;
src_b = dst_b > src_b ? dst_b - src_b : 0;
src_a = qMin(src_a, dst_a);
}
break;
case DARKEN_ONLY_MODE: {
src_r = dst_r < src_r ? dst_r : src_r;
src_g = dst_g < src_g ? dst_g : src_g;
src_b = dst_b < src_b ? dst_b : src_b;
src_a = qMin(src_a, dst_a);
}
break;
case LIGHTEN_ONLY_MODE: {
src_r = dst_r < src_r ? src_r : dst_r;
src_g = dst_g < src_g ? src_g : dst_g;
src_b = dst_b < src_b ? src_b : dst_b;
src_a = qMin(src_a, dst_a);
}
break;
case HUE_MODE: {
uchar new_r = dst_r;
uchar new_g = dst_g;
uchar new_b = dst_b;
RGBTOHSV(src_r, src_g, src_b);
RGBTOHSV(new_r, new_g, new_b);
new_r = src_r;
HSVTORGB(new_r, new_g, new_b);
src_r = new_r;
src_g = new_g;
src_b = new_b;
src_a = qMin(src_a, dst_a);
}
break;
case SATURATION_MODE: {
uchar new_r = dst_r;
uchar new_g = dst_g;
uchar new_b = dst_b;
RGBTOHSV(src_r, src_g, src_b);
RGBTOHSV(new_r, new_g, new_b);
new_g = src_g;
HSVTORGB(new_r, new_g, new_b);
src_r = new_r;
src_g = new_g;
src_b = new_b;
src_a = qMin(src_a, dst_a);
}
break;
case VALUE_MODE: {
uchar new_r = dst_r;
uchar new_g = dst_g;
uchar new_b = dst_b;
RGBTOHSV(src_r, src_g, src_b);
RGBTOHSV(new_r, new_g, new_b);
new_b = src_b;
HSVTORGB(new_r, new_g, new_b);
src_r = new_r;
src_g = new_g;
src_b = new_b;
src_a = qMin(src_a, dst_a);
}
break;
case COLOR_MODE: {
uchar new_r = dst_r;
uchar new_g = dst_g;
uchar new_b = dst_b;
RGBTOHLS(src_r, src_g, src_b);
RGBTOHLS(new_r, new_g, new_b);
new_r = src_r;
new_b = src_b;
HLSTORGB(new_r, new_g, new_b);
src_r = new_r;
src_g = new_g;
src_b = new_b;
src_a = qMin(src_a, dst_a);
}
break;
case DODGE_MODE: {
uint tmp;
tmp = dst_r << 8;
tmp /= 256 - src_r;
src_r = (uchar) qMin(tmp, 255u);
tmp = dst_g << 8;
tmp /= 256 - src_g;
src_g = (uchar) qMin(tmp, 255u);
tmp = dst_b << 8;
tmp /= 256 - src_b;
src_b = (uchar) qMin(tmp, 255u);
src_a = qMin(src_a, dst_a);
}
break;
case BURN_MODE: {
uint tmp;
tmp = (255 - dst_r) << 8;
tmp /= src_r + 1;
src_r = (uchar) qMin(tmp, 255u);
src_r = 255 - src_r;
tmp = (255 - dst_g) << 8;
tmp /= src_g + 1;
src_g = (uchar) qMin(tmp, 255u);
src_g = 255 - src_g;
tmp = (255 - dst_b) << 8;
tmp /= src_b + 1;
src_b = (uchar) qMin(tmp, 255u);
src_b = 255 - src_b;
src_a = qMin(src_a, dst_a);
}
break;
case HARDLIGHT_MODE: {
uint tmp;
if (src_r > 128) {
tmp = ((int)255 - dst_r) * ((int) 255 - ((src_r - 128) << 1));
src_r = (uchar) qMin(255 - (tmp >> 8), 255u);
} else {
tmp = (int) dst_r * ((int) src_r << 1);
src_r = (uchar) qMin(tmp >> 8, 255u);
}
if (src_g > 128) {
tmp = ((int)255 - dst_g) * ((int) 255 - ((src_g - 128) << 1));
src_g = (uchar) qMin(255 - (tmp >> 8), 255u);
} else {
tmp = (int) dst_g * ((int) src_g << 1);
src_g = (uchar) qMin(tmp >> 8, 255u);
}
if (src_b > 128) {
tmp = ((int)255 - dst_b) * ((int) 255 - ((src_b - 128) << 1));
src_b = (uchar) qMin(255 - (tmp >> 8), 255u);
} else {
tmp = (int) dst_b * ((int) src_b << 1);
src_b = (uchar) qMin(tmp >> 8, 255u);
}
src_a = qMin(src_a, dst_a);
}
break;
case SOFTLIGHT_MODE: {
uint tmpS, tmpM;
tmpM = INT_MULT(dst_r, src_r);
tmpS = 255 - INT_MULT((255 - dst_r), (255 - src_r));
src_r = INT_MULT((255 - dst_r), tmpM)
+ INT_MULT(dst_r, tmpS);
tmpM = INT_MULT(dst_g, src_g);
tmpS = 255 - INT_MULT((255 - dst_g), (255 - src_g));
src_g = INT_MULT((255 - dst_g), tmpM)
+ INT_MULT(dst_g, tmpS);
tmpM = INT_MULT(dst_b, src_b);
tmpS = 255 - INT_MULT((255 - dst_b), (255 - src_b));
src_b = INT_MULT((255 - dst_b), tmpM)
+ INT_MULT(dst_b, tmpS);
src_a = qMin(src_a, dst_a);
}
break;
case GRAIN_EXTRACT_MODE: {
int tmp;
tmp = dst_r - src_r + 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_r = (uchar) tmp;
tmp = dst_g - src_g + 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_g = (uchar) tmp;
tmp = dst_b - src_b + 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_b = (uchar) tmp;
src_a = qMin(src_a, dst_a);
}
break;
case GRAIN_MERGE_MODE: {
int tmp;
tmp = dst_r + src_r - 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_r = (uchar) tmp;
tmp = dst_g + src_g - 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_g = (uchar) tmp;
tmp = dst_b + src_b - 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src_b = (uchar) tmp;
src_a = qMin(src_a, dst_a);
}
break;
}
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
uchar new_r, new_g, new_b, new_a;
new_a = dst_a + INT_MULT(OPAQUE_OPACITY - dst_a, src_a);
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
new_r = (uchar)(src_ratio * src_r + dst_ratio * dst_r + EPSILON);
new_g = (uchar)(src_ratio * src_g + dst_ratio * dst_g + EPSILON);
new_b = (uchar)(src_ratio * src_b + dst_ratio * dst_b + EPSILON);
if (!layer_modes[layer.mode].affect_alpha) {
new_a = dst_a;
}
image.setPixel(m, n, qRgba(new_r, new_g, new_b, new_a));
}
/*!
* Merge a Gray pixel from the layer to the Gray image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeGrayToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = layer.image_tiles[j][i].pixelIndex(k, l);
image.setPixel(m, n, src);
}
/*!
* Merge a GrayA pixel from the layer to the Gray image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeGrayAToGray(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = qGray(layer.image_tiles[j][i].pixel(k, l));
int dst = image.pixelIndex(m, n);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
if (!src_a) {
return; // nothing to merge
}
switch (layer.mode) {
case MULTIPLY_MODE: {
src = INT_MULT(src, dst);
}
break;
case DIVIDE_MODE: {
src = qMin((dst * 256) / (1 + src), 255);
}
break;
case SCREEN_MODE: {
src = 255 - INT_MULT(255 - dst, 255 - src);
}
break;
case OVERLAY_MODE: {
src = INT_MULT(dst, dst + INT_MULT(2 * src, 255 - dst));
}
break;
case DIFFERENCE_MODE: {
src = dst > src ? dst - src : src - dst;
}
break;
case ADDITION_MODE: {
src = add_lut(dst, src);
}
break;
case SUBTRACT_MODE: {
src = dst > src ? dst - src : 0;
}
break;
case DARKEN_ONLY_MODE: {
src = dst < src ? dst : src;
}
break;
case LIGHTEN_ONLY_MODE: {
src = dst < src ? src : dst;
}
break;
case DODGE_MODE: {
uint tmp = dst << 8;
tmp /= 256 - src;
src = (uchar) qMin(tmp, 255u);
}
break;
case BURN_MODE: {
uint tmp = (255 - dst) << 8;
tmp /= src + 1;
src = (uchar) qMin(tmp, 255u);
src = 255 - src;
}
break;
case HARDLIGHT_MODE: {
uint tmp;
if (src > 128) {
tmp = ((int)255 - dst) * ((int) 255 - ((src - 128) << 1));
src = (uchar) qMin(255 - (tmp >> 8), 255u);
} else {
tmp = (int) dst * ((int) src << 1);
src = (uchar) qMin(tmp >> 8, 255u);
}
}
break;
case SOFTLIGHT_MODE: {
uint tmpS, tmpM;
tmpM = INT_MULT(dst, src);
tmpS = 255 - INT_MULT((255 - dst), (255 - src));
src = INT_MULT((255 - dst), tmpM)
+ INT_MULT(dst, tmpS);
}
break;
case GRAIN_EXTRACT_MODE: {
int tmp;
tmp = dst - src + 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src = (uchar) tmp;
}
break;
case GRAIN_MERGE_MODE: {
int tmp;
tmp = dst + src - 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src = (uchar) tmp;
}
break;
}
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
uchar new_a = OPAQUE_OPACITY;
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
uchar new_g = (uchar)(src_ratio * src + dst_ratio * dst + EPSILON);
image.setPixel(m, n, new_g);
}
/*!
* Merge a Gray pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeGrayToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.opacity;
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Merge a GrayA pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeGrayAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = qGray(layer.image_tiles[j][i].pixel(k, l));
int dst = qGray(image.pixel(m, n));
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
uchar dst_a = qAlpha(image.pixel(m, n));
if (!src_a) {
return; // nothing to merge
}
switch (layer.mode) {
case MULTIPLY_MODE: {
src = INT_MULT(src, dst);
src_a = qMin(src_a, dst_a);
}
break;
case DIVIDE_MODE: {
src = qMin((dst * 256) / (1 + src), 255);
src_a = qMin(src_a, dst_a);
}
break;
case SCREEN_MODE: {
src = 255 - INT_MULT(255 - dst, 255 - src);
src_a = qMin(src_a, dst_a);
}
break;
case OVERLAY_MODE: {
src = INT_MULT(dst, dst + INT_MULT(2 * src, 255 - dst));
src_a = qMin(src_a, dst_a);
}
break;
case DIFFERENCE_MODE: {
src = dst > src ? dst - src : src - dst;
src_a = qMin(src_a, dst_a);
}
break;
case ADDITION_MODE: {
src = add_lut(dst, src);
src_a = qMin(src_a, dst_a);
}
break;
case SUBTRACT_MODE: {
src = dst > src ? dst - src : 0;
src_a = qMin(src_a, dst_a);
}
break;
case DARKEN_ONLY_MODE: {
src = dst < src ? dst : src;
src_a = qMin(src_a, dst_a);
}
break;
case LIGHTEN_ONLY_MODE: {
src = dst < src ? src : dst;
src_a = qMin(src_a, dst_a);
}
break;
case DODGE_MODE: {
uint tmp = dst << 8;
tmp /= 256 - src;
src = (uchar) qMin(tmp, 255u);
src_a = qMin(src_a, dst_a);
}
break;
case BURN_MODE: {
uint tmp = (255 - dst) << 8;
tmp /= src + 1;
src = (uchar) qMin(tmp, 255u);
src = 255 - src;
src_a = qMin(src_a, dst_a);
}
break;
case HARDLIGHT_MODE: {
uint tmp;
if (src > 128) {
tmp = ((int)255 - dst) * ((int) 255 - ((src - 128) << 1));
src = (uchar) qMin(255 - (tmp >> 8), 255u);
} else {
tmp = (int) dst * ((int) src << 1);
src = (uchar) qMin(tmp >> 8, 255u);
}
src_a = qMin(src_a, dst_a);
}
break;
case SOFTLIGHT_MODE: {
uint tmpS, tmpM;
tmpM = INT_MULT(dst, src);
tmpS = 255 - INT_MULT((255 - dst), (255 - src));
src = INT_MULT((255 - dst), tmpM)
+ INT_MULT(dst, tmpS);
src_a = qMin(src_a, dst_a);
}
break;
case GRAIN_EXTRACT_MODE: {
int tmp;
tmp = dst - src + 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src = (uchar) tmp;
src_a = qMin(src_a, dst_a);
}
break;
case GRAIN_MERGE_MODE: {
int tmp;
tmp = dst + src - 128;
tmp = qMin(tmp, 255);
tmp = qMax(tmp, 0);
src = (uchar) tmp;
src_a = qMin(src_a, dst_a);
}
break;
}
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
uchar new_a = dst_a + INT_MULT(OPAQUE_OPACITY - dst_a, src_a);
const float src_ratio = new_a == 0 ? 1.0 : (float)src_a / new_a;
float dst_ratio = 1.0 - src_ratio;
uchar new_g = (uchar)(src_ratio * src + dst_ratio * dst + EPSILON);
if (!layer_modes[layer.mode].affect_alpha) {
new_a = dst_a;
}
image.setPixel(m, n, qRgba(new_g, new_g, new_g, new_a));
}
/*!
* Merge an Indexed pixel from the layer to the Indexed image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeIndexedToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
int src = layer.image_tiles[j][i].pixelIndex(k, l);
image.setPixel(m, n, src);
}
/*!
* Merge an IndexedA pixel from the layer to the Indexed image. Straight-forward.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeIndexedAToIndexed(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
uchar src = layer.image_tiles[j][i].pixelIndex(k, l);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
src_a = INT_MULT(src_a, layer.opacity);
if (layer.apply_mask == 1 &&
layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
if (src_a > 127) {
src++;
image.setPixel(m, n, src);
}
}
/*!
* Merge an IndexedA pixel from the layer to an RGB image. Straight-forward.
* The only thing this has to take account of is the opacity of the
* layer. Evidently, the GIMP exporter itself does not actually do this.
* \param layer source layer.
* \param i x tile index.
* \param j y tile index.
* \param k x pixel index of tile i,j.
* \param l y pixel index of tile i,j.
* \param image destination image.
* \param m x pixel of destination image.
* \param n y pixel of destination image.
*/
void XCFImageFormat::mergeIndexedAToRGB(const Layer &layer, uint i, uint j, int k, int l,
QImage &image, int m, int n)
{
QRgb src = layer.image_tiles[j][i].pixel(k, l);
uchar src_a = layer.alpha_tiles[j][i].pixelIndex(k, l);
src_a = INT_MULT(src_a, layer.opacity);
// Apply the mask (if any)
if (layer.apply_mask == 1 && layer.mask_tiles.size() > (int)j &&
layer.mask_tiles[j].size() > (int)i) {
src_a = INT_MULT(src_a, layer.mask_tiles[j][i].pixelIndex(k, l));
}
// This is what appears in the GIMP window
if (src_a <= 127) {
src_a = 0;
} else {
src_a = OPAQUE_OPACITY;
}
image.setPixel(m, n, qRgba(src, src_a));
}
/*!
* Dissolving pixels: pick a random number between 0 and 255. If the pixel's
* alpha is less than that, make it transparent.
* \param image the image tile to dissolve.
* \param x the global x position of the tile.
* \param y the global y position of the tile.
*/
void XCFImageFormat::dissolveRGBPixels(QImage &image, int x, int y)
{
// The apparently spurious rand() calls are to wind the random
// numbers up to the same point for each tile.
for (int l = 0; l < image.height(); l++) {
srand(random_table[(l + y) % RANDOM_TABLE_SIZE]);
for (int k = 0; k < x; k++) {
rand();
}
for (int k = 0; k < image.width(); k++) {
int rand_val = rand() & 0xff;
QRgb pixel = image.pixel(k, l);
if (rand_val > qAlpha(pixel)) {
image.setPixel(k, l, qRgba(pixel, 0));
}
}
}
}
/*!
* Dissolving pixels: pick a random number between 0 and 255. If the pixel's
* alpha is less than that, make it transparent. This routine works for
* the GRAYA and INDEXEDA image types where the pixel alpha's are stored
* separately from the pixel themselves.
* \param image the alpha tile to dissolve.
* \param x the global x position of the tile.
* \param y the global y position of the tile.
*/
void XCFImageFormat::dissolveAlphaPixels(QImage &image, int x, int y)
{
// The apparently spurious rand() calls are to wind the random
// numbers up to the same point for each tile.
for (int l = 0; l < image.height(); l++) {
srand(random_table[(l + y) % RANDOM_TABLE_SIZE]);
for (int k = 0; k < x; k++) {
rand();
}
for (int k = 0; k < image.width(); k++) {
int rand_val = rand() & 0xff;
uchar alpha = image.pixelIndex(k, l);
if (rand_val > alpha) {
image.setPixel(k, l, 0);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
XCFHandler::XCFHandler()
{
}
bool XCFHandler::canRead() const
{
if (canRead(device())) {
setFormat("xcf");
return true;
}
return false;
}
bool XCFHandler::read(QImage *image)
{
XCFImageFormat xcfif;
return xcfif.readXCF(device(), image);
}
bool XCFHandler::write(const QImage &)
{
return false;
}
bool XCFHandler::canRead(QIODevice *device)
{
if (!device) {
qWarning("DDSHandler::canRead() called with no device");
return false;
}
qint64 oldPos = device->pos();
char head[8];
qint64 readBytes = device->read(head, sizeof(head));
if (readBytes != sizeof(head)) {
if (device->isSequential()) {
while (readBytes > 0) {
device->ungetChar(head[readBytes-- - 1]);
}
} else {
device->seek(oldPos);
}
return false;
}
if (device->isSequential()) {
while (readBytes > 0) {
device->ungetChar(head[readBytes-- - 1]);
}
} else {
device->seek(oldPos);
}
return qstrncmp(head, "gimp xcf", 8) == 0;
}
QImageIOPlugin::Capabilities XCFPlugin::capabilities(QIODevice *device, const QByteArray &format) const
{
if (format == "xcf") {
return Capabilities(CanRead);
}
if (!format.isEmpty()) {
return {};
}
if (!device->isOpen()) {
return {};
}
Capabilities cap;
if (device->isReadable() && XCFHandler::canRead(device)) {
cap |= CanRead;
}
return cap;
}
QImageIOHandler *XCFPlugin::create(QIODevice *device, const QByteArray &format) const
{
QImageIOHandler *handler = new XCFHandler;
handler->setDevice(device);
handler->setFormat(format);
return handler;
}
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