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buffer: add buffer_resize()

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tokyo4j 2025-05-30 20:55:31 +09:00 • committed by Hiroaki Yamamoto
parent 0657a1d767
commit 82b0235aca
3 changed files with 44 additions and 40 deletions
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35
src/buffer.c
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@ -29,6 +29,7 @@
#include <drm_fourcc.h>
#include <wlr/interfaces/wlr_buffer.h>
#include "buffer.h"
#include "common/box.h"
#include "common/mem.h"
static const struct wlr_buffer_impl data_buffer_impl;
@ -146,3 +147,37 @@ buffer_create_from_data(void *pixel_data, uint32_t width, uint32_t height,
buffer->surface_owns_data = false;
return buffer;
}
struct lab_data_buffer *
buffer_resize(struct lab_data_buffer *src_buffer, int width, int height,
double scale)
{
assert(src_buffer);
cairo_surface_t *surface = src_buffer->surface;
int src_w = cairo_image_surface_get_width(surface);
int src_h = cairo_image_surface_get_height(surface);
struct lab_data_buffer *buffer =
buffer_create_cairo(width, height, scale);
cairo_t *cairo = cairo_create(buffer->surface);
struct wlr_box container = {
.width = width,
.height = height,
};
struct wlr_box dst_box = box_fit_within(src_w, src_h, &container);
double scene_scale = (double)dst_box.width / (double)src_w;
cairo_translate(cairo, dst_box.x, dst_box.y);
cairo_scale(cairo, scene_scale, scene_scale);
cairo_set_source_surface(cairo, surface, 0, 0);
cairo_pattern_set_filter(cairo_get_source(cairo), CAIRO_FILTER_GOOD);
cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
cairo_paint(cairo);
cairo_surface_flush(buffer->surface);
cairo_destroy(cairo);
return buffer;
}