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buffer: add buffer_create_from_wlr_buffer()

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tokyo4j 2025-05-30 20:58:15 +09:00 • committed by Hiroaki Yamamoto
parent 82b0235aca
commit 649773b4f8
2 changed files with 34 additions and 0 deletions
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7
include/buffer.h
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@ -70,6 +70,13 @@ 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);
/*
* Create a lab_data_buffer from a wlr_buffer by copying its content.
* The wlr_buffer must be backed by shm.
*/
struct lab_data_buffer *buffer_create_from_wlr_buffer(
struct wlr_buffer *wlr_buffer);
/*
* 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.

27
src/buffer.c
View file

@ -28,6 +28,7 @@
#include <stdlib.h>
#include <drm_fourcc.h>
#include <wlr/interfaces/wlr_buffer.h>
#include <wlr/util/log.h>
#include "buffer.h"
#include "common/box.h"
#include "common/mem.h"
@ -148,6 +149,32 @@ buffer_create_from_data(void *pixel_data, uint32_t width, uint32_t height,
return buffer;
}
struct lab_data_buffer *
buffer_create_from_wlr_buffer(struct wlr_buffer *wlr_buffer)
{
void *data;
uint32_t format;
size_t stride;
if (!wlr_buffer_begin_data_ptr_access(wlr_buffer,
WLR_BUFFER_DATA_PTR_ACCESS_READ, &data, &format, &stride)) {
wlr_log(WLR_ERROR, "failed to access wlr_buffer");
return NULL;
}
if (format != DRM_FORMAT_ARGB8888) {
/* TODO: support other formats */
wlr_buffer_end_data_ptr_access(wlr_buffer);
wlr_log(WLR_ERROR, "cannot create buffer: format=%d", format);
return NULL;
}
size_t buffer_size = stride * wlr_buffer->height;
void *copied_data = xmalloc(buffer_size);
memcpy(copied_data, data, buffer_size);
wlr_buffer_end_data_ptr_access(wlr_buffer);
return buffer_create_from_data(copied_data,
wlr_buffer->width, wlr_buffer->height, stride);
}
struct lab_data_buffer *
buffer_resize(struct lab_data_buffer *src_buffer, int width, int height,
double scale)