PolytreeDE/picom
1
0
Fork 0
mirror of https://github.com/yshui/picom.git synced 2025-03-17 17:24:25 -04:00
Code Releases Activity

backend: xrender: implement read_pixel

Browse source 
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2021-06-09 01:51:33 +01:00
parent 1ada765436
commit d9c9742132
No known key found for this signature in database
GPG key ID: D3A4405BE6CC17F4
2 changed files with 27 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
.clang-tidy
View file

@ -16,4 +16,6 @@ AnalyzeTemporaryDtors: false
FormatStyle: file
CheckOptions:
- key: readability-magic-numbers.IgnoredIntegerValues
value: 4;8;16;24;32;1;2;3;4096;65536
value: 4;8;16;24;32;1;2;3;4096;65536;
- key: readability-magic-numbers.IgnoredFloatingPointValues
value: 255.0;

24
src/backend/xrender/xrender.c
View file

@ -559,6 +559,29 @@ static void get_blur_size(void *blur_context, int *width, int *height) {
*height = ctx->resize_height;
}
static bool
read_pixel(backend_t *backend_data, void *image_data, int x, int y, struct color *output) {
auto xd = (struct _xrender_data *)backend_data;
auto img = (struct _xrender_image_data *)image_data;
auto r = XCB_AWAIT(xcb_get_image, xd->base.c, XCB_IMAGE_FORMAT_XY_PIXMAP, img->pixmap,
to_i16_checked(x), to_i16_checked(y), 1, 1, (uint32_t)-1L);
if (!r) {
return false;
}
// Color format seems to be BGRA8888, see glamor_format_for_pixmap from the
// Xserver codebase.
uint8_t *pixels = xcb_get_image_data(r);
output->blue = pixels[0] / 255.0;
output->green = pixels[1] / 255.0;
output->red = pixels[2] / 255.0;
output->alpha = pixels[3] / 255.0;
return true;
}
static backend_t *backend_xrender_init(session_t *ps) {
auto xd = ccalloc(1, struct _xrender_data);
init_backend_base(&xd->base, ps);
@ -655,6 +678,7 @@ struct backend_operations xrender_ops = {
.max_buffer_age = 2,
.image_op = image_op,
.read_pixel = read_pixel,
.copy = copy,
.create_blur_context = create_blur_context,
.destroy_blur_context = destroy_blur_context,