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- Rename `scaled_scene_buffer` to `scaled_buffer`. This makes it clear
that `scaled_{font,img,icon}_buffers` are implementations of it.
- Move the files from `src/common` to `src/scaled-buffer` as
`scaled_icon_buffer` heavily depends on `server` and `view` etc.
84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef LABWC_SCALED_FONT_BUFFER_H
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#define LABWC_SCALED_FONT_BUFFER_H
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#include "common/font.h"
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struct wlr_scene_tree;
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struct wlr_scene_buffer;
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struct scaled_buffer;
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struct scaled_font_buffer {
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struct wlr_scene_buffer *scene_buffer;
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int width; /* unscaled, read only */
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int height; /* unscaled, read only */
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/* Private */
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char *text;
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int max_width;
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float color[4];
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float bg_color[4];
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struct font font;
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struct scaled_buffer *scaled_buffer;
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/*
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* The following fields are used only for the titlebar, where
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* the font buffer can be rendered with a pattern background to
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* support gradients. In this case, the font buffer is also
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* padded to a fixed height (with the text centered vertically)
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* in order to align the pattern with the rest of the titlebar.
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*/
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int fixed_height;
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cairo_pattern_t *bg_pattern; /* overrides bg_color if set */
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};
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/**
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* Create an auto scaling font 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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* To actually show some text, scaled_font_buffer_update() has to be called.
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*
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*/
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struct scaled_font_buffer *scaled_font_buffer_create(struct wlr_scene_tree *parent);
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/**
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* Create an auto scaling font buffer for titlebar text.
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* The font buffer takes a new reference to bg_pattern.
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*
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* @param fixed_height Fixed height for the buffer (logical pixels)
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* @param bg_pattern Background pattern (solid color or gradient)
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*/
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struct scaled_font_buffer *
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scaled_font_buffer_create_for_titlebar(struct wlr_scene_tree *parent,
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int fixed_height, cairo_pattern_t *bg_pattern);
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/**
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* Update an existing auto scaling font buffer.
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*
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* No steps are taken to detect if its actually required to render a new buffer.
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* This should be done by the caller to prevent useless recreation of the same
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* buffer in case nothing actually changed.
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*
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* Some basic checks could be something like
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* - truncated = buffer->width == max_width
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* - text_changed = strcmp(old_text, new_text)
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* - font and color the same
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*
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* bg_color is ignored for font buffers created with
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* scaled_font_buffer_create_for_titlebar().
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*/
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void scaled_font_buffer_update(struct scaled_font_buffer *self, const char *text,
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int max_width, struct font *font, const float *color,
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const float *bg_color);
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/**
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* Update the max width of an existing auto scaling font buffer
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* and force a new render.
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*
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* No steps are taken to detect if its actually required to render a new buffer.
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*/
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void scaled_font_buffer_set_max_width(struct scaled_font_buffer *self, int max_width);
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#endif /* LABWC_SCALED_FONT_BUFFER_H */
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