// blit an RGBA img, blending matte colour with src alpha onto the dest
void BlitMatteRGBA8(
Img const& srcimg, Box const& srcbox,
Img& destimg, Box& destbox,
PenColour const& matte )
{
assert(srcimg.Fmt()==FMT_RGBA8);
Box destclipped( destbox );
Box srcclipped( srcbox );
clip_blit( srcimg.Bounds(), srcclipped, destimg.Bounds(), destclipped );
const int w = destclipped.w;
int y;
for( y=0; y<destclipped.h; ++y )
{
RGBA8 const* src = srcimg.PtrConst_RGBA8( srcclipped.x+0, srcclipped.y+y );
switch(destimg.Fmt())
{
case FMT_I8:
scan_matte_RGBA8_I8(src, destimg.Ptr_I8(destclipped.x+0,destclipped.y+y), w, matte.idx());
break;
case FMT_RGBX8:
scan_matte_RGBA8_RGBX8(src, destimg.Ptr_RGBX8(destclipped.x+0,destclipped.y+y), w, matte.rgb());
break;
case FMT_RGBA8:
scan_matte_RGBA8_RGBA8(src, destimg.Ptr_RGBA8(destclipped.x+0,destclipped.y+y), w, matte.rgb());
break;
default:
assert(false);
break;
}
}
destbox = destclipped;
}
// TODO: src,dest names meaningless. Should be a,b or something neutral
void BlitSwap(
Img& srcimg, Box const& srcbox,
Img& destimg, Box& destbox)
{
assert( srcimg.Fmt() == destimg.Fmt());
Box destclipped( destbox );
Box srcclipped( srcbox );
clip_blit( srcimg.Bounds(), srcclipped, destimg.Bounds(), destclipped );
int y;
for( y=0; y<destclipped.h; ++y )
{
switch(srcimg.Fmt())
{
case FMT_I8:
{
I8* src = srcimg.Ptr_I8( srcclipped.x+0, srcclipped.y+y );
I8* dest = destimg.Ptr_I8( destclipped.x+0, destclipped.y+y );
std::swap_ranges( src,src+destclipped.w, dest);
}
break;
case FMT_RGBX8:
{
RGBX8* src = srcimg.Ptr_RGBX8( srcclipped.x+0, srcclipped.y+y );
RGBX8* dest = destimg.Ptr_RGBX8( destclipped.x+0, destclipped.y+y );
std::swap_ranges( src,src+destclipped.w, dest);
}
break;
case FMT_RGBA8:
{
RGBA8* src = srcimg.Ptr_RGBA8( srcclipped.x+0, srcclipped.y+y );
RGBA8* dest = destimg.Ptr_RGBA8( destclipped.x+0, destclipped.y+y );
std::swap_ranges( src,src+destclipped.w, dest);
}
break;
default:
assert(false);
break;
}
}
destbox = destclipped;
}
// blit from an I8 source to any target, with colourkey transparency
void BlitI8Keyed(
Img const& srcimg, Box const& srcbox,
Palette const& srcpalette,
Img& destimg, Box& destbox,
int transparentIdx )
{
assert(srcimg.Fmt()==FMT_I8);
Box destclipped( destbox );
Box srcclipped( srcbox );
clip_blit( srcimg.Bounds(), srcclipped, destimg.Bounds(), destclipped );
const int w = destclipped.w;
int y;
for( y=0; y<destclipped.h; ++y )
{
I8 const* src = srcimg.PtrConst_I8( srcclipped.x+0, srcclipped.y+y );
switch(destimg.Fmt())
{
case FMT_I8:
scan_I8_I8_keyed(src, destimg.Ptr_I8(destclipped.x+0,destclipped.y+y), w, transparentIdx);
break;
case FMT_RGBX8:
scan_I8_RGBX8_keyed(src, srcpalette, destimg.Ptr_RGBX8(destclipped.x+0,destclipped.y+y), w, transparentIdx);
break;
case FMT_RGBA8:
scan_I8_RGBA8_keyed(src, srcpalette, destimg.Ptr_RGBA8(destclipped.x+0,destclipped.y+y), w, transparentIdx);
break;
default:
assert(false);
break;
}
}
destbox = destclipped;
}