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just skip alpha component for RGBA format

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Vincent Wei
2019-06-23 12:34:38 +08:00
parent 775b7586d6
commit d24fa1c8e5
1 changed files with 13 additions and 0 deletions
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13
src/mybmp/jpeg.c
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@@ -627,6 +627,18 @@ static BYTE* MYBITMAP_get_pixel_row_BGR(unsigned int next_scanline,
static BYTE* MYBITMAP_get_pixel_row_RGBA(unsigned int next_scanline,
MYBITMAP* mybmp,RGB* pal,BYTE* linebuffer)
{
#if 1 /* just skip the alpha component */
int i, j;
BYTE* bits = mybmp->bits + mybmp->pitch * next_scanline;
for (i = 0, j = 0; i < mybmp->w; i++, j += 3) {
linebuffer[j ] = (JSAMPLE)(bits[i * 4 + 2]); /* red */
linebuffer[j + 1] = (JSAMPLE)(bits[i * 4 + 1]); /* green */
linebuffer[j + 2] = (JSAMPLE)(bits[i * 4]); /* blue */
}
return (JSAMPROW)linebuffer;
#else
int i, j;
RGB* bits = (RGB*)(mybmp->bits + mybmp->pitch * next_scanline);
RGB pixel;
@@ -651,6 +663,7 @@ static BYTE* MYBITMAP_get_pixel_row_RGBA(unsigned int next_scanline,
linebuffer[ j + 2 ] += (JSAMPLE)((Uint32)bgcolor.b * (255 - pixel.a) >> 8); /* blue + background color */
}
return linebuffer;
#endif
}
/* Expanded data destination object for MG_RWops output */