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cbgfx: Add blend functions to calculate transparency

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Up until now we have no way of adding transparency into our firmware
screens.  Add set_blend() and clear_blend() functions to store alpha
value and rgb values to calculate alpha blending in
calculate_colors().

BUG=b:144969091,b:160839199
BRANCH=puff
TEST=dut-control power_state:rec
     press ctrl-d
     Ensure background is dimmed when dialog pops up

Change-Id: I95468f27836d34ab80392727d726a69c09dc168e
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43358
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Shelley Chen
2020-07-10 14:52:43 -07:00
committed by Julius Werner
parent df5571dc9d
commit 31a3788739
2 changed files with 84 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
payloads/libpayload/drivers/video/graphics.c
View File

@@ -61,6 +61,37 @@ static const struct vector vzero = {
.y = 0,
};
struct blend_value {
uint8_t alpha;
struct rgb_color rgb;
};
static struct blend_value blend = {
.alpha = 0,
.rgb.red = 0,
.rgb.green = 0,
.rgb.blue = 0,
};
int set_blend(const struct rgb_color *rgb, uint8_t alpha)
{
if (rgb == NULL)
return CBGFX_ERROR_INVALID_PARAMETER;
blend.alpha = alpha;
blend.rgb = *rgb;
return CBGFX_SUCCESS;
}
void clear_blend(void)
{
blend.alpha = 0;
blend.rgb.red = 0;
blend.rgb.green = 0;
blend.rgb.blue = 0;
}
static void add_vectors(struct vector *out,
const struct vector *v1, const struct vector *v2)
{
@@ -135,16 +166,33 @@ static int within_box(const struct vector *v, const struct rect *bound)
return -1;
}
/*
* Helper function that applies color and opacity from blend struct
* into the color.
*/
static inline uint8_t apply_blend(uint8_t color, uint8_t blend_color)
{
if (blend.alpha == 0 || color == blend_color)
return color;
return (color * (256 - blend.alpha) +
blend_color * blend.alpha) / 256;
}
static inline uint32_t calculate_color(const struct rgb_color *rgb,
uint8_t invert)
{
uint32_t color = 0;
color |= (rgb->red >> (8 - fbinfo->red_mask_size))
<< fbinfo->red_mask_pos;
color |= (rgb->green >> (8 - fbinfo->green_mask_size))
<< fbinfo->green_mask_pos;
color |= (rgb->blue >> (8 - fbinfo->blue_mask_size))
<< fbinfo->blue_mask_pos;
color |= (apply_blend(rgb->red, blend.rgb.red)
>> (8 - fbinfo->red_mask_size))
<< fbinfo->red_mask_pos;
color |= (apply_blend(rgb->green, blend.rgb.green)
>> (8 - fbinfo->green_mask_size))
<< fbinfo->green_mask_pos;
color |= (apply_blend(rgb->blue, blend.rgb.blue)
>> (8 - fbinfo->blue_mask_size))
<< fbinfo->blue_mask_pos;
if (invert)
color ^= 0xffffffff;
return color;