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Add scaled_font_buffer implementation

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Consolatis 2022-06-13 21:33:32 +02:00 • committed by Johan Malm
parent c3f07aacf0
commit 5d79911244
3 changed files with 148 additions and 0 deletions
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49
include/common/scaled_font_buffer.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __LAB_COMMON_SCALED_FONT_BUFFER_H
#define __LAB_COMMON_SCALED_FONT_BUFFER_H
struct font;
struct wlr_scene_tree;
struct wlr_scene_buffer;
struct scaled_scene_buffere;
struct scaled_font_buffer {
struct wlr_scene_buffer *scene_buffer;
int width; /* unscaled, read only */
int height; /* unscaled, read only */
/* Private */
char *text;
int max_width;
float color[4];
struct font font;
struct scaled_scene_buffer *scaled_buffer;
};
/**
* Create an auto scaling font buffer, providing a wlr_scene_buffer node for
* display. It gets destroyed automatically when the backing scaled_scene_buffer
* is being destoyed which in turn happens automatically when the backing
* wlr_scene_buffer (or one of its parents) is being destroyed.
*
* To actually show some text, scaled_font_buffer_update() has to be called.
*
*/
struct scaled_font_buffer *scaled_font_buffer_create(struct wlr_scene_tree *parent);
/**
* Update an existing auto scaling font buffer.
*
* No steps are taken to detect if its actually required to render a new buffer.
* This should be done by the caller to prevent useless recreation of the same
* buffer in case nothing actually changed.
*
* Some basic checks could be something like
* - truncated = buffer->width == max_width
* - text_changed = strcmp(old_text, new_text)
* - font and color the same
*/
void scaled_font_buffer_update(struct scaled_font_buffer *self, const char *text,
int max_width, struct font *font, float *color);
#endif /* __LAB_COMMON_SCALED_FONT_BUFFER_H */