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SCUMM HE: Implement premultiplied transparency rendering

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This commit is contained in:
Eugene Sandulenko 2016-05-02 22:18:32 +02:00
parent 60729f38be
commit b72890ea30
2 changed files with 24 additions and 1 deletions
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24
engines/scumm/he/moonbase/moonbase.cpp
View File

@ -104,8 +104,30 @@ void Moonbase::blitT14WizImage(uint8 *dst, int dstw, int dsth, int dstPitch, con
pixels -= code;
} else { // special case
if (width - pixels >= srcx) {
int alpha = code >> 1;
uint16 color = READ_LE_UINT16(singlesOffset);
WRITE_LE_UINT16(dst1, color);
//WRITE_LE_UINT16(dst1, color); // ENABLE_PREMUL_ALPHA = 0
// ENABLE_PREMUL_ALPHA = 2
if (alpha > 32) {
alpha -= 32;
uint32 orig = READ_LE_UINT16(dst1);
uint32 oR = orig & 0x7c00;
uint32 oG = orig & 0x03e0;
uint32 oB = orig & 0x1f;
uint32 dR = ((((color & 0x7c00) - oR) * alpha) >> 5) + oR;
uint32 dG = ((((color & 0x3e0) - oG) * alpha) >> 5) + oG;
uint32 dB = ((((color & 0x1f) - oB) * alpha) >> 5) + oB;
WRITE_LE_UINT16(dst1, (dR & 0x7c00) | (dG & 0x3e0) | (dB & 0x1f));
} else {
uint32 orig = READ_LE_UINT16(dst1);
uint32 pass1 = ((((orig << 16) | orig) & 0x3e07c1f * alpha) >> 5) & 0x3e07c1f;
uint32 pass2 = (((pass1 << 16) | pass1) + color) & 0xffff;
WRITE_LE_UINT16(dst1, pass2);
}
dst1 += 2;
}
singlesOffset += 2;

1
engines/scumm/he/wiz_he.cpp
View File

@ -1773,6 +1773,7 @@ void Wiz::copy555WizImage(uint8 *dst, uint8 *wizd, int dstPitch, int dstType,
switch (rawROP) {
default:
case 1:
// MMX_PREMUL_ALPHA_COPY
break;
case 2: