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Make YUV to RGB conversion work on big endian as well. 

Refs #816.
master
cybersphinx 2011-05-06 16:10:08 +02:00
parent 46695905ac
commit 2a637d009c
1 changed files with 22 additions and 6 deletions
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28
lib/sequence/sequence.cpp
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@ -306,6 +306,22 @@ static void deallocateVideoFrame(void)
glDeleteTextures(1, &video_texture);
}
#ifndef __BIG_ENDIAN__
const int Rshift = 0;
const int Gshift = 8;
const int Bshift = 16;
const int Ashift = 24;
// RGBmask is used only after right-shifting, so ignore the leftmost bit of each byte
const int RGBmask = 0x007f7f7f;
const int Amask = 0xff000000;
#else
const int Rshift = 24;
const int Gshift = 16;
const int Bshift = 8;
const int Ashift = 0;
const int RGBmask = 0x7f7f7f00;
const int Amask = 0x000000ff;
#endif
#define Vclip( x ) ( (x > 0) ? ((x < 255) ? x : 255) : 0 )
// main routine to display video on screen.
static void video_write(bool update)
@ -351,17 +367,17 @@ static void video_write(bool update)
int G = Vclip((A - 100 * U - (C >> 1) + 128) >> 8);
int B = Vclip((A + 516 * U + 128) >> 8);
uint32_t rgba = (B << 16) | (G << 8) | (R << 0) | (0xFF << 24);
uint32_t rgba = (R << Rshift) | (G << Gshift) | (B << Bshift) | (0xFF << Ashift);
RGBAframe[rgb_offset] = rgba;
if (use_scanlines == SCANLINES_50)
{
// halve the rgb values for a dimmed scanline
RGBAframe[rgb_offset + video_width] = (rgba >> 1 & 0x007f7f7f) | 0xff000000;
RGBAframe[rgb_offset + video_width] = (rgba >> 1 & RGBmask) | Amask;
}
else if (use_scanlines == SCANLINES_BLACK)
{
RGBAframe[rgb_offset + video_width] = (0xFF << 24);
RGBAframe[rgb_offset + video_width] = Amask;
}
rgb_offset++;
@ -373,16 +389,16 @@ static void video_write(bool update)
G = Vclip((A - 100 * U - (C >> 1) + 128) >> 8);
B = Vclip((A + 516 * U + 128) >> 8);
rgba = (B << 16) | (G << 8) | (R << 0) | (0xFF << 24);
rgba = (R << Rshift) | (G << Gshift) | (B << Bshift) | (0xFF << Ashift);
RGBAframe[rgb_offset] = rgba;
if (use_scanlines == SCANLINES_50)
{
// halve the rgb values for a dimmed scanline
RGBAframe[rgb_offset + video_width] = (rgba >> 1 & 0x007f7f7f) | 0xff000000;
RGBAframe[rgb_offset + video_width] = (rgba >> 1 & RGBmask) | Amask;
}
else if (use_scanlines == SCANLINES_BLACK)
{
RGBAframe[rgb_offset + video_width] = (0xFF << 24);
RGBAframe[rgb_offset + video_width] = Amask;
}
rgb_offset++;
}