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ported (modified) r815 from voker_dev

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git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@912 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
This commit is contained in:
michael
2008-12-27 06:44:47 +00:00
parent 52df507b2f
commit 1c01c975d4
1 changed files with 23 additions and 3 deletions
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drv_generic_graphic.c
+23 -3
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@@ -177,7 +177,7 @@ static void drv_generic_graphic_blit(const int row, const int col, const int hei
static RGBA drv_generic_graphic_blend(const int row, const int col)
{
int l;
int l, o;
RGBA p;
RGBA ret;
@@ -185,9 +185,29 @@ static RGBA drv_generic_graphic_blend(const int row, const int col)
ret.G = BL_COL.G;
ret.B = BL_COL.B;
ret.A = 0xff;
for (l = LAYERS - 1; l >= 0; l--) {
/* find first opaque layer */
/* layers below are fully covered */
o = LAYERS - 1;
for (l = 0; l < LAYERS; l++) {
p = drv_generic_graphic_FB[l][row * LCOLS + col];
if (p.A > 0) {
if (p.A == 255) {
o = l;
break;
}
}
for (l = o; l >= 0; l--) {
p = drv_generic_graphic_FB[l][row * LCOLS + col];
switch (p.A) {
case 0:
break;
case 255:
ret.R = p.R;
ret.G = p.G;
ret.B = p.B;
break;
default:
ret.R = (p.R * p.A + ret.R * (255 - p.A)) / 255;
ret.G = (p.G * p.A + ret.G * (255 - p.A)) / 255;
ret.B = (p.B * p.A + ret.B * (255 - p.A)) / 255;