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Use component-based r/b swap, instead of up-casting

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svn path=/trunk/netsurf/; revision=11595
This commit is contained in:
John Mark Bell 2011-02-01 21:47:05 +00:00
parent d20ee298b1
commit 13d2e98c99
1 changed files with 16 additions and 15 deletions
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31
image/rsvg.c
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@ -46,8 +46,8 @@
#include "utils/messages.h"
#include "utils/talloc.h"
static inline void rsvg_argb_to_abgr(uint32_t pixels[], int width, int height,
size_t rowstride);
static inline void rsvg_argb_to_abgr(uint8_t *pixels,
int width, int height, size_t rowstride);
bool rsvg_create(struct content *c, const struct http_parameter *params)
{
@ -88,30 +88,31 @@ bool rsvg_process_data(struct content *c, const char *data,
}
/** Convert Cairo's ARGB output to NetSurf's favoured ABGR format. It converts
* the data in-place. Operation is endian-swap and rotate right 8 bits.
* the data in-place.
*
* \param pixels Array of 32-bit values, in the form of ARGB. This will
* \param pixels Pixel data, in the form of ARGB. This will
* be overwritten with new data in the form of ABGR.
* \param width Width of the bitmap
* \param height Height of the bitmap
* \param rowstride Number of bytes to skip after each row (this
* implementation requires this to be a multiple of 4.)
*/
static inline void rsvg_argb_to_abgr(uint32_t pixels[], int width, int height,
size_t rowstride)
static inline void rsvg_argb_to_abgr(uint8_t *pixels,
int width, int height, size_t rowstride)
{
uint32_t *p = &pixels[0];
uint8_t *p = pixels;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
uint32_t e = p[x];
uint32_t s = (((e & 0xff) << 24) |
((e & 0xff00) << 8) |
((e & 0xff0000) >> 8) |
((e & 0xff000000) >> 24));
p[x] = (s >> 8) | (s << 24);
/* Swap R and B */
const uint8_t r = p[x+3];
p[x+3] = p[x];
p[x] = r;
}
p += (rowstride >> 2);
p += rowstride;
}
}
@ -166,7 +167,7 @@ bool rsvg_convert(struct content *c)
}
rsvg_handle_render_cairo(d->rsvgh, d->ct);
rsvg_argb_to_abgr((uint32_t *)bitmap_get_buffer(d->bitmap),
rsvg_argb_to_abgr(bitmap_get_buffer(d->bitmap),
c->width, c->height,
bitmap_get_rowstride(d->bitmap));