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bitmap drawing: Support alpha blend if image over the framebuffer contents.

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If DRMODE_FG now the alpha channel in bitmaps can be used to draw the bitmap
over the framebuffer, so that e.g. a line selector isn't cleared for
for transparent bitmap pixels.

Change-Id: I09d59a09d2f3c90450a0fe2b83c6c59d757b686b
This commit is contained in:
Thomas Martitz 2013-02-11 07:16:58 +01:00
parent 68d3ce2acd
commit bd67f3dc6b
1 changed files with 14 additions and 6 deletions
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20
firmware/drivers/lcd-16bit-common.c
View file

@ -930,14 +930,12 @@ static void ICODE_ATTR lcd_alpha_bitmap_part_mix(const fb_data* image,
drmode &= DRMODE_SOLID; /* mask out inversevid */
}
if (drmode == DRMODE_BG)
{
dmask = ~dmask;
}
/* Set to DRMODE_BG as we use its code path in the switch below */
/* If drawmode is FG use a separate special case that blends the image
* onto the current framebuffer contents. Otherwise BG is forced that
* blends the image with the backdrop (if any, otherwise background color )*/
if (image != NULL)
{
drmode = DRMODE_BG;
}
drmode = (drmode == DRMODE_FG) ? DRMODE_FG|DRMODE_INT_MOD : DRMODE_BG;
/* Use extra bit to avoid if () in the switch-cases below */
if ((drmode & DRMODE_BG) && lcd_backdrop)
drmode |= DRMODE_INT_MOD;
@ -1049,6 +1047,16 @@ static void ICODE_ATTR lcd_alpha_bitmap_part_mix(const fb_data* image,
}
while (--col);
break;
case DRMODE_FG|DRMODE_INT_MOD:
do
{
*dst = blend_two_colors(*dst, *image, data & ALPHA_COLOR_LOOKUP_SIZE );
dst += COL_INC;
image += STRIDE_MAIN(1, stride_image);
UPDATE_SRC_ALPHA;
}
while (--col);
break;
case DRMODE_FG:
fg = current_vp->fg_pattern;
do