76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
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/*
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* Copyright 2021 Advanced Micro Devices, Inc.
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* Copyright 2022 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#pragma once
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#include <stdint.h>
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#include <pixman.h>
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#include <assert.h>
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/** A collection of basic information extracted from a pixman_image_t */
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struct image_header {
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int width;
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int height;
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pixman_format_code_t pixman_format;
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int stride_bytes;
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unsigned char *data;
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};
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/** Populate image_header from pixman_image_t */
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static inline struct image_header
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image_header_from(pixman_image_t *image)
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{
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struct image_header h;
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h.width = pixman_image_get_width(image);
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h.height = pixman_image_get_height(image);
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h.pixman_format = pixman_image_get_format(image);
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h.stride_bytes = pixman_image_get_stride(image);
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h.data = (void *)pixman_image_get_data(image);
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return h;
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}
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/** Get pointer to the beginning of the row
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*
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* \param header Header describing the Pixman image.
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* \param y Index of the desired row, starting from zero.
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* \return Pointer to the first pixel of the row.
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*
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* Asserts that y is within image height, and that pixel format uses 32 bits
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* per pixel.
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*/
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static inline uint32_t *
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image_header_get_row_u32(const struct image_header *header, int y)
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{
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assert(y >= 0);
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assert(y < header->height);
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assert(PIXMAN_FORMAT_BPP(header->pixman_format) == 32);
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return (uint32_t *)(header->data + y * header->stride_bytes);
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}
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