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new backend: gl_common: add support for decoupling lazy copied images

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Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui
2019-05-06 22:09:03 +01:00
parent b91888b0a3
commit 86f4d73c22
4 changed files with 253 additions and 150 deletions
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9
src/backend/backend.h
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@@ -42,7 +42,7 @@ enum image_operations {
IMAGE_OP_APPLY_ALPHA_ALL,
// Change the effective size of the image, without touching the backing image
// itself. When the image is used, the backing image should be tiled to fill its
// effective size. `reg_op` and `reg_visibile` is ignored. `arg` is two integers,
// effective size. `reg_op` and `reg_visible` is ignored. `arg` is two integers,
// width and height, in that order.
IMAGE_OP_RESIZE_TILE,
};
@@ -80,6 +80,11 @@ struct backend_operations {
// =========== Rendering ============
// NOTE: general idea about reg_paint/reg_op vs reg_visible is that reg_visible is
// merely a hint. Ignoring reg_visible entirely don't affect the correctness of
// the operation performed. OTOH reg_paint/reg_op is part of the parameters of the
// operation, and must be honored in order to complete the operation correctly.
/// Called before when a new frame starts.
///
/// Optional
@@ -93,7 +98,7 @@ 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_visibile 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);