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67 lines
3.5 KiB
C
67 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef LABWC_SCALED_IMG_BUFFER_H
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#define LABWC_SCALED_IMG_BUFFER_H
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struct wlr_scene_tree;
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struct wlr_scene_node;
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struct wlr_scene_buffer;
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struct lab_img;
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struct scaled_img_buffer {
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struct scaled_buffer *scaled_buffer;
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struct wlr_scene_buffer *scene_buffer;
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struct lab_img *img;
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int width;
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int height;
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};
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/*
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* | |
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* .------------------. .------------.
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* scaled_img_buffer | new_output_scale | | set_buffer |
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* architecture ´------------------` ´------------`
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* | ^
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* .--------------------------------|----------------|-------------.
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* | v | |
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* | .-------------------. .-------------------------. |
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* | | scaled_img_buffer |----| wlr_buffer LRU cache(2) |<----, |
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* | ´-------------------` ´-------------------------` | |
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* | | | | |
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* | | .--------------------------. | |
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* | | | wlr_buffer LRU cache of | | |
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* .-------. | | | other scaled_img_buffers | | |
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* | theme | | | | with lab_img_equal() | | |
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* ´-------` | | ´--------------------------` | |
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* | | | / | | |
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* | | | not found found | |
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* .---------. | .---------. .----------. .------------. | |
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* | lab_img |-img_copy-->| lab_img |-----| render() |--->| wlr_buffer |-----` |
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* ´---------` | ´---------` ´----------` ´------------` |
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* \ | / |
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* \ ´----------/----------------------------------------------------`
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* \ /
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* .----------------. lab_img provides:
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* | lab_img_data | - render function
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* | refcount=2 | - list of modification functions
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* | `-----------------. to apply on top of lib_img_data
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* | | when rendering
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* | provides (depending on backend): | - lab_img_equal() comparing the
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* | - librsvg handle | lab_img_data reference and
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* | - cairo surface | modification function pointers
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* ´----------------------------------` of two given lab_img instances
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*
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*/
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/*
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* Create an auto scaling image buffer, providing a wlr_scene_buffer node for
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* display. It gets destroyed automatically when the backing scaled_buffer
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* is being destroyed which in turn happens automatically when the backing
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* wlr_scene_buffer (or one of its parents) is being destroyed.
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*
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* This function clones the lab_img passed as the image source, so callers are
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* free to destroy it.
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*/
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struct scaled_img_buffer *scaled_img_buffer_create(struct wlr_scene_tree *parent,
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struct lab_img *img, int width, int height);
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#endif /* LABWC_SCALED_IMG_BUFFER_H */
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