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backend: add new API: read_pixel 

Potential use: to read the border color of a window, so we could draw
rounded border when we round the corners of the window.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2021-04-13 14:53:34 +01:00
parent 468d8a0879
commit 6faafa95bf
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1 changed files with 14 additions and 1 deletions
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15
src/backend/backend.h
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@ -129,7 +129,7 @@ struct backend_operations {
* @param image_data the image to paint
* @param dst_x, dst_y the top left corner of the image in the target
* @param reg_paint the clip region, in target coordinates
* @param reg_visible the visible region, in target coordinates
* @param reg_visible the visible region, in target coordinates
*/
void (*compose)(backend_t *backend_data, void *image_data, int dst_x, int dst_y,
const region_t *reg_paint, const region_t *reg_visible);
@ -219,6 +219,19 @@ struct backend_operations {
bool (*image_op)(backend_t *backend_data, enum image_operations op, void *image_data,
const region_t *reg_op, const region_t *reg_visible, void *args);
/**
* Read the color of the pixel at given position of the given image
*
* @param backend_data backend_data
* @param image_data an image data structure previously returned by the
* backend. the image to read pixel from.
* @param x, y coordinate of the pixel to read
* @param[out] color the color of the pixel
* @return whether the operation is successful
*/
bool (*read_pixel)(backend_t *backend_data, void *image_data, int x, int y,
struct color *output);
/// Create another instance of the `image_data`. All `image_op` calls on the
/// returned image should not affect the original image
void *(*copy)(backend_t *base, const void *image_data, const region_t *reg_visible);