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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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7
include/buffer.h
View file

@ -70,4 +70,11 @@ struct lab_data_buffer *buffer_create_cairo(uint32_t logical_width,
struct lab_data_buffer *buffer_create_from_data(void *pixel_data, uint32_t width,
uint32_t height, uint32_t stride);
/*
* Resize a buffer to the given size. The source buffer is rendered at the
* center of the output buffer and shrunk if it overflows from the output buffer.
*/
struct lab_data_buffer *buffer_resize(struct lab_data_buffer *src_buffer,
int width, int height, double scale);
#endif /* LABWC_BUFFER_H */

35
src/buffer.c
View file

@ -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;
}

42
src/img/img.c
View file

@ -112,42 +112,6 @@ lab_img_add_modifier(struct lab_img *img, lab_img_modifier_func_t modifier)
*mod = modifier;
}
/*
* Takes a source surface from PNG/XBM/XPM file and output a buffer for the
* given size. The source surface is placed at the center of the output buffer
* and shrunk if it overflows from the output buffer.
*/
static struct lab_data_buffer *
render_cairo_surface(cairo_surface_t *surface, int width, int height,
double scale)
{
assert(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_destroy(cairo);
return buffer;
}
struct lab_data_buffer *
lab_img_render(struct lab_img *img, int width, int height, double scale)
{
@ -158,13 +122,11 @@ lab_img_render(struct lab_img *img, int width, int height, double scale)
case LAB_IMG_PNG:
case LAB_IMG_XBM:
case LAB_IMG_XPM:
buffer = render_cairo_surface(img->data->buffer->surface,
width, height, scale);
buffer = buffer_resize(img->data->buffer, width, height, scale);
break;
#if HAVE_RSVG
case LAB_IMG_SVG:
buffer = img_svg_render(img->data->svg, width, height,
scale);
buffer = img_svg_render(img->data->svg, width, height, scale);
break;
#endif
default: