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SDL_SaveBMP_IO: Write bitmap header v5 values

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bV4CSType was changed to LCS_sRGB to work with Preview on macOS.

Fixes: #11903
This commit is contained in:
John Kvalevog
2025-02-01 11:13:47 -06:00
committed by Sam Lantinga
parent fe6bd8e9bf
commit dc13a6ae95
1 changed files with 36 additions and 4 deletions
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40
src/video/SDL_bmp.c
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@@ -46,11 +46,23 @@
#endif
// Logical color space values for BMP files
// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/eb4bbd50-b3ce-4917-895c-be31f214797f
#ifndef LCS_WINDOWS_COLOR_SPACE
// 0x57696E20 == "Win "
#define LCS_WINDOWS_COLOR_SPACE 0x57696E20
#endif
#ifndef LCS_sRGB
// 0x73524742 == "sRGB"
#define LCS_sRGB 0x73524742
#endif
// Logical/physical color relationship
// https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-wmf/9fec0834-607d-427d-abd5-ab240fb0db38
#ifndef LCS_GM_GRAPHICS
#define LCS_GM_GRAPHICS 0x00000002
#endif
static bool readRlePixels(SDL_Surface *surface, SDL_IOStream *src, int isRle8)
{
/*
@@ -637,6 +649,12 @@ bool SDL_SaveBMP_IO(SDL_Surface *surface, SDL_IOStream *dst, bool closeio)
Uint32 bV4GammaGreen = 0;
Uint32 bV4GammaBlue = 0;
// The additional header members from the Win32 BITMAPV5HEADER struct (124 bytes in total)
Uint32 bV5Intent = 0;
Uint32 bV5ProfileData = 0;
Uint32 bV5ProfileSize = 0;
Uint32 bV5Reserved = 0;
// Make sure we have somewhere to save
if (!SDL_SurfaceValid(surface)) {
SDL_InvalidParamError("surface");
@@ -728,19 +746,25 @@ bool SDL_SaveBMP_IO(SDL_Surface *surface, SDL_IOStream *dst, bool closeio)
}
biClrImportant = 0;
// Set the BMP info values for the version 4 header
// Set the BMP info values
if (save32bit && !saveLegacyBMP) {
biSize = 108;
biSize = 124;
// Version 4 values
biCompression = BI_BITFIELDS;
// The BMP format is always little endian, these masks stay the same
bV4RedMask = 0x00ff0000;
bV4GreenMask = 0x0000ff00;
bV4BlueMask = 0x000000ff;
bV4AlphaMask = 0xff000000;
bV4CSType = LCS_WINDOWS_COLOR_SPACE;
bV4CSType = LCS_sRGB;
bV4GammaRed = 0;
bV4GammaGreen = 0;
bV4GammaBlue = 0;
// Version 5 values
bV5Intent = LCS_GM_GRAPHICS;
bV5ProfileData = 0;
bV5ProfileSize = 0;
bV5Reserved = 0;
}
// Write the BMP info values
@@ -758,8 +782,9 @@ bool SDL_SaveBMP_IO(SDL_Surface *surface, SDL_IOStream *dst, bool closeio)
goto done;
}
// Write the BMP info values for the version 4 header
// Write the BMP info values
if (save32bit && !saveLegacyBMP) {
// Version 4 values
if (!SDL_WriteU32LE(dst, bV4RedMask) ||
!SDL_WriteU32LE(dst, bV4GreenMask) ||
!SDL_WriteU32LE(dst, bV4BlueMask) ||
@@ -777,6 +802,13 @@ bool SDL_SaveBMP_IO(SDL_Surface *surface, SDL_IOStream *dst, bool closeio)
!SDL_WriteU32LE(dst, bV4GammaBlue)) {
goto done;
}
// Version 5 values
if (!SDL_WriteU32LE(dst, bV5Intent) ||
!SDL_WriteU32LE(dst, bV5ProfileData) ||
!SDL_WriteU32LE(dst, bV5ProfileSize) ||
!SDL_WriteU32LE(dst, bV5Reserved)) {
goto done;
}
}
// Write the palette (in BGR color order)