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video: Export a function to draw a BMP with transparency

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Provide a new BMP function which can draw a bitmap while regarding a
chosen colour as transparent.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-10-02 02:49:02 -06:00
parent b1bfb5ae92
commit 55d408d4d9
3 changed files with 74 additions and 10 deletions
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62
test/dm/video.c
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@@ -667,15 +667,25 @@ static int dm_test_video_comp_bmp8(struct unit_test_state *uts)
}
DM_TEST(dm_test_video_comp_bmp8, UTF_SCAN_PDATA | UTF_SCAN_FDT);
/* Test drawing the riscos pointer */
static int dm_test_video_bmp_alpha(struct unit_test_state *uts)
/**
* check_bmp_alpha() - Test drawing the riscos pointer with transparency
*
* Draws the riscos pointer BMP in various positions with and without
* transparency to verify alpha blending works correctly
*
* @uts: Test state
* @dev: Video device
* @first: Expected compression after first pointer draw
* @second: Expected compression after second pointer draw
* @trans: Expected compression after drawing with transparency
* Return: 0 if OK, -ve on error
*/
static int check_bmp_alpha(struct unit_test_state *uts, struct udevice *dev,
int first, int second, int trans)
{
struct video_priv *priv;
struct udevice *dev;
struct video_priv *priv = dev_get_uclass_priv(dev);
ulong addr;
ut_assertok(video_get_nologo(uts, &dev));
priv = dev_get_uclass_priv(dev);
addr = map_to_sysmem(video_image_getptr(riscos_arrow));
/* Draw a black rectangle first */
@@ -684,17 +694,49 @@ static int dm_test_video_bmp_alpha(struct unit_test_state *uts)
/* Draw the pointer on top of the black rectangle */
ut_assertok(video_bmp_display(dev, addr, 110, 110, false));
ut_asserteq(174, video_compress_fb(uts, dev, false));
ut_asserteq(first, video_compress_fb(uts, dev, false));
ut_assertok(video_check_copy_fb(uts, dev));
/* Draw the pointer on top of the black rectangle */
/* Draw the pointer on top of the white background */
ut_assertok(video_bmp_display(dev, addr, 350, 110, false));
ut_asserteq(249, video_compress_fb(uts, dev, false));
ut_asserteq(second, video_compress_fb(uts, dev, false));
/* Draw the pointer with white (0xffffff) as transparent */
ut_assertok(video_bmp_displaya(dev, addr, 110, 160, false, true,
0xffffff));
ut_assertok(video_bmp_displaya(dev, addr, 350, 160, false, true,
0xffffff));
ut_asserteq(trans, video_compress_fb(uts, dev, false));
ut_assertok(video_check_copy_fb(uts, dev));
return 0;
}
DM_TEST(dm_test_video_bmp_alpha, UTF_SCAN_PDATA | UTF_SCAN_FDT);
/* Test drawing the riscos pointer on a 16bpp display */
static int dm_test_video_bmp_alpha16(struct unit_test_state *uts)
{
struct udevice *dev;
ut_assertok(video_get_nologo(uts, &dev));
ut_assertok(check_bmp_alpha(uts, dev, 174, 249, 358));
return 0;
}
DM_TEST(dm_test_video_bmp_alpha16, UTF_SCAN_PDATA | UTF_SCAN_FDT);
/* Test drawing the riscos pointer on 32bpp display */
static int dm_test_video_bmp_alpha32(struct unit_test_state *uts)
{
struct udevice *dev;
ut_assertok(uclass_find_first_device(UCLASS_VIDEO, &dev));
ut_assertnonnull(dev);
ut_assertok(sandbox_sdl_set_bpp(dev, VIDEO_BPP32));
ut_assertok(check_bmp_alpha(uts, dev, 641, 710, 869));
return 0;
}
DM_TEST(dm_test_video_bmp_alpha32, UTF_SCAN_PDATA | UTF_SCAN_FDT);
/* Test TrueType console */
static int dm_test_video_truetype(struct unit_test_state *uts)