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RAW: Allow preview loading

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This patch addresses reports of performance issues on large raw collections. Programs that generate previews must use the plugin correctly.

**Setting quality to 0 may return a different image than in the past** (Nothing changes for all other quality values): the plugin loads the embedded thumbnail and, in case of error, decodes the image with quality 1. When compiled with libRAW 0.21+, the plugin automatically select the largest preview from the ones in the file.
This commit is contained in:
Mirco Miranda
2025-01-08 07:01:57 +00:00
parent c97ee00f5e
commit 1982557a55
2 changed files with 80 additions and 4 deletions
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8
src/imageformats/raw_p.h
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@ -60,7 +60,8 @@ private:
* @note It is safe to set both W and A: W is used if camera white balance is found, otherwise A is used.
*
* When quality is a positive value, a value between 0 and 100 is expected. The values are interpreted as follows:
* - 00-09: I = 0, C = 1, B = 0, W = 1, A = 1, H = 1 (Linear, sRGB, 8-bits, Camera White, Auto White, Half-size)
* - 00 : Embedded preview, if fails same as Half-Size (01-09)
* - 01-09: I = 0, C = 1, B = 0, W = 1, A = 1, H = 1 (Linear, sRGB, 8-bits, Camera White, Auto White, Half-size)
* - 10-19: I = 0, C = 1, B = 0, W = 1, A = 1, H = 0 (Linear, sRGB, 8-bits, Camera White, Auto White)
* - 20-29: I = 3, C = 1, B = 0, W = 1, A = 1, H = 0 (AHD, sRGB, 8-bits, Camera White, Auto White)
* - 30-39: I = 3, C = 1, B = 1, W = 1, A = 1, H = 0 (AHD, sRGB, 16-bits, Camera White, Auto White) [Default]
@ -72,11 +73,12 @@ private:
* - >= 90: I = 11, C = 4, B = 1, W = 1, A = 1, H = 0 (DHT, ProPhoto, 16-bits, Camera White, Auto White)
*
* When the quality is -1, default quality is used.
* @sa m_subType
*/
qint32 m_quality;
/*!
* \brief m_startPos
/**
* @brief m_startPos
* The initial device position to allow multi image load (cache value).
*/
qint64 m_startPos;