mirror of
https://gitlab.freedesktop.org/wayland/weston
synced 2024-07-01 07:14:39 +00:00
9b82bfae9e
Move the struct image_header and get_image_prop() into a header where we can share these useful helpers between more test code. While doing that, drop the unused field 'depth', rename into image_header_from(), and introduce a helper to get u32 pointer to the beginning of a row. These helpers should make pixel iterating code easier to read and safer (less room for mistakes in address computations, and asserts). Use the shared 'struct image_header' instead of the local one. The intention is to make the code easier to read by using the same helpers everywhere. Width, height and stride use type 'int' because Pixman API uses that too. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/*
|
|
* Copyright 2021 Advanced Micro Devices, Inc.
|
|
* Copyright 2022 Collabora, Ltd.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial
|
|
* portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
#include <pixman.h>
|
|
#include <assert.h>
|
|
|
|
/** A collection of basic information extracted from a pixman_image_t */
|
|
struct image_header {
|
|
int width;
|
|
int height;
|
|
pixman_format_code_t pixman_format;
|
|
|
|
int stride_bytes;
|
|
unsigned char *data;
|
|
};
|
|
|
|
/** Populate image_header from pixman_image_t */
|
|
static inline struct image_header
|
|
image_header_from(pixman_image_t *image)
|
|
{
|
|
struct image_header h;
|
|
|
|
h.width = pixman_image_get_width(image);
|
|
h.height = pixman_image_get_height(image);
|
|
h.pixman_format = pixman_image_get_format(image);
|
|
h.stride_bytes = pixman_image_get_stride(image);
|
|
h.data = (void *)pixman_image_get_data(image);
|
|
|
|
return h;
|
|
}
|
|
|
|
/** Get pointer to the beginning of the row
|
|
*
|
|
* \param header Header describing the Pixman image.
|
|
* \param y Index of the desired row, starting from zero.
|
|
* \return Pointer to the first pixel of the row.
|
|
*
|
|
* Asserts that y is within image height, and that pixel format uses 32 bits
|
|
* per pixel.
|
|
*/
|
|
static inline uint32_t *
|
|
image_header_get_row_u32(const struct image_header *header, int y)
|
|
{
|
|
assert(y >= 0);
|
|
assert(y < header->height);
|
|
assert(PIXMAN_FORMAT_BPP(header->pixman_format) == 32);
|
|
|
|
return (uint32_t *)(header->data + y * header->stride_bytes);
|
|
}
|