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engine: imagelib: add BGRA saving for PNG

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Fix incorrect output, when input format has alpha but flags don't
have set IMAGE_HAS_ALPHA.
Flags are meant to control output format, but input format may be arbitrary,
as usually given by video driver(screenshots, etc)
This commit is contained in:
Alibek Omarov 2021-03-28 00:34:42 +03:00
parent c62db950f1
commit 9c8059ea96
1 changed files with 39 additions and 12 deletions
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51
engine/common/imagelib/img_png.c
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@ -427,12 +427,10 @@ qboolean Image_SavePNG( const char *name, rgbdata_t *pix )
// get image description
switch( pix->type )
{
case PF_RGB_24:
pixel_size = 3;
break;
case PF_RGBA_32:
pixel_size = 4;
break;
case PF_BGR_24:
case PF_RGB_24: pixel_size = 3; break;
case PF_BGRA_32:
case PF_RGBA_32: pixel_size = 4; break;
default:
return false;
}
@ -443,19 +441,48 @@ qboolean Image_SavePNG( const char *name, rgbdata_t *pix )
filtered_size = ( rowsize + 1 ) * pix->height;
out = filtered_buffer = Mem_Malloc( host.imagepool, filtered_size );
in = pix->buffer;
// apply adaptive filter to image
for( y = 0; y < pix->height; y++ )
switch( pix->type )
{
*out++ = PNG_F_NONE;
rowend = in + rowsize;
for( ; in < rowend; )
case PF_RGB_24:
case PF_RGBA_32:
for( y = 0; y < pix->height; y++ )
{
*out++ = *in++;
in = pix->buffer + y * pix->width * pixel_size;
*out++ = PNG_F_NONE;
rowend = in + rowsize;
for( ; in < rowend; in += pixel_size )
{
*out++ = in[0];
*out++ = in[1];
*out++ = in[2];
if( pix->flags & IMAGE_HAS_ALPHA )
*out++ = in[3];
}
}
break;
case PF_BGR_24:
case PF_BGRA_32:
for( y = 0; y < pix->height; y++ )
{
in = pix->buffer + y * pix->width * pixel_size;
*out++ = PNG_F_NONE;
rowend = in + rowsize;
for( ; in < rowend; in += pixel_size )
{
*out++ = in[2];
*out++ = in[1];
*out++ = in[0];
if( pix->flags & IMAGE_HAS_ALPHA )
*out++ = in[3];
}
}
break;
}
// get IHDR chunk length
ihdr_len = sizeof( png_ihdr_t );