Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* Pixman stride and buffer size helpers.
|
|
* Expects PIXMAN_FORMAT_BPP() and pixman_format_code_t to be
|
|
* already defined (by either <pixman.h> or "pixman-minimal.h").
|
|
*/
|
|
|
|
#ifndef QEMU_PIXMAN_HELPERS_H
|
|
#define QEMU_PIXMAN_HELPERS_H
|
|
|
|
/*
|
|
* Compute the row stride for a pixman image, aligned to sizeof(uint32_t),
|
|
* as pixman does. Returns -1 on integer overflow.
|
|
*/
|
|
static inline int qemu_pixman_stride(pixman_format_code_t format, int width)
|
|
{
|
|
int stride;
|
|
|
|
if (unlikely(__builtin_mul_overflow(width, PIXMAN_FORMAT_BPP(format),
|
|
&stride)) ||
|
|
unlikely(__builtin_add_overflow(stride, 31, &stride))) {
|
|
return -1;
|
|
}
|
|
return (stride / 32) * sizeof(uint32_t);
|
|
}
|
|
|
|
/*
|
|
* Compute stride and buffer size for a pixman image.
|
|
* If *rowstride_bytes is 0, compute it from format and width
|
|
* (aligned to sizeof(uint32_t), as pixman does).
|
|
* Returns false on integer overflow.
|
|
*/
|
|
static inline bool qemu_pixman_image_calc_size(pixman_format_code_t format,
|
|
int width, int height,
|
|
int *rowstride_bytes,
|
|
size_t *buf_size)
|
|
{
|
|
if (!*rowstride_bytes) {
|
|
*rowstride_bytes = qemu_pixman_stride(format, width);
|
|
if (*rowstride_bytes < 0) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return likely(!__builtin_mul_overflow((size_t)height,
|
|
(size_t)*rowstride_bytes, buf_size));
|
|
}
|
|
|
|
#endif /* QEMU_PIXMAN_HELPERS_H */
|