/*
* PixelFormat conversion library.
*
* Author: Gerd Hoffmann <kraxel@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu-common.h"
#include "console.h"
#include "pflib.h"
typedef struct QemuPixel QemuPixel;
typedef void (*pf_convert)(QemuPfConv *conv,
void *dst, void *src, uint32_t cnt);
typedef void (*pf_convert_from)(PixelFormat *pf,
QemuPixel *dst, void *src, uint32_t cnt);
typedef void (*pf_convert_to)(PixelFormat *pf,
void *dst, QemuPixel *src, uint32_t cnt);
struct QemuPfConv {
pf_convert convert;
PixelFormat src;
PixelFormat dst;
/* for copy_generic() */
pf_convert_from conv_from;
pf_convert_to conv_to;
QemuPixel *conv_buf;
uint32_t conv_cnt;
};
struct QemuPixel {
uint8_t red;
uint8_t green;
uint8_t blue;
uint8_t alpha;
};
/* ----------------------------------------------------------------------- */
/* PixelFormat -> QemuPixel conversions */
static void conv_16_to_pixel(PixelFormat *pf,
QemuPixel *dst, void *src, uint32_t cnt)
{
uint16_t *src16 = src;
while (cnt > 0) {
dst->red = ((*src16 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
dst->green = ((*src16 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
dst->blue = ((*src16 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
dst->alpha = ((*src16 & pf->amask) >> pf->ashift) << (8 - pf->abits);
dst++, src16++, cnt--;
}
}
/* assumes pf->{r,g,b,a}bits == 8 */
static void conv_32_to_pixel_fast(PixelFormat *pf,
QemuPixel *dst, void *src, uint32_t cnt)
{
uint32_t *src32 = src;
while (cnt > 0) {
dst->red = (*src32 & pf->rmask) >> pf->rshift;
dst->green = (*src32 & pf->gmask) >> pf->gshift;
dst->blue = (*src32 & pf->bmask) >> pf->bshift;
dst->alpha = (*src32 & pf->amask) >> pf->ashift;
dst++, src32++, cnt--;
}
}
static void conv_32_to_pixel_generic(PixelFormat *pf,
QemuPixel *dst, void *src, uint32_t cnt)
{
uint32_t *src32 = src;
while (cnt > 0) {
if (pf->rbits < 8) {
dst->red = ((*src32 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
} else {
dst->red = ((*src32 & pf->rmask) >> pf->rshift) >> (pf->rbits - 8);
}
if (pf->gbits < 8) {
dst->green = ((*src32 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
} else {
dst->green = ((*src32 & pf->gmask) >> pf->gshift) >> (pf->gbits - 8);
}
if (pf->bbits < 8) {
dst->blue = ((*src32 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
} else {
dst->blue = ((*src32 & pf->bmask) >> pf->bshift) >> (pf->bbits - 8);
}
if (pf->abits < 8) {
dst->alpha = ((*src32 & pf->amask) >> pf->ashift) << (8 - pf->abits);
} else {
dst->alpha = ((*src32 & pf->amask) >> pf->ashift) >> (pf->abits - 8);
}
dst++, src32++, cnt--;
}
}
/* ----------------------------------------------------------------------- */
/* QemuPixel -> PixelFormat conversions */
static void conv_pixel_to_16(PixelFormat *pf,
void *dst, QemuPixel *src, uint32_t cnt)
{
uint16_t *dst16 = dst;
while (cnt > 0) {
*dst16 = ((uint16_t)src->red >> (8 - pf->rbits)) << pf->rshift;
*dst16 |= ((uint16_t)src->green >> (8 - pf->gbits)) << pf->gshift;
*dst16 |= ((uint16_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
*dst16 |= ((uint16_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
dst16++, src++, cnt--;
}
}
static void conv_pixel_to_32(PixelFormat *pf,
void *dst, QemuPixel *src, uint32_t cnt)
{
uint32_t *dst32 = dst;
while (cnt > 0) {
*dst32 = ((uint32_t)src->red >> (8 - pf->rbits)) << pf->rshift;
*dst32 |= ((uint32_t)src->green >> (8 - pf->gbits)) << pf->gshift;
*dst32 |= ((uint32_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
*dst32 |= ((uint32_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
dst32++, src++, cnt--;
}
}
/* ----------------------------------------------------------------------- */
/* PixelFormat -> PixelFormat conversions */
static void convert_copy(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
{
uint32_t bytes = cnt * conv->src.bytes_per_pixel;
memcpy(dst, src, bytes);
}
static void convert_generic(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
{
if (conv->conv_cnt < cnt) {
conv->conv_cnt = cnt;
conv->conv_buf = g_realloc(conv->conv_buf, sizeof(QemuPixel) * conv->conv_cnt);
}
conv->conv_from(&conv->src, conv->conv_buf, src, cnt);
conv->conv_to(&conv->dst, dst, conv->conv_buf, cnt);
}
/* ----------------------------------------------------------------------- */
/* public interface */
QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src)
{
QemuPfConv *conv = g_malloc0(sizeof(QemuPfConv));
conv->src = *src;
conv->dst = *dst;
if (memcmp(&conv->src, &conv->dst, sizeof(PixelFormat)) == 0) {
/* formats identical, can simply copy */
conv->convert = convert_copy;
} else {
/* generic two-step conversion: src -> QemuPixel -> dst */
switch (conv->src.bytes_per_pixel) {
case 2:
conv->conv_from = conv_16_to_pixel;
break;
case 4:
if (conv->src.rbits == 8 && conv->src.gbits == 8 && conv->src.bbits == 8) {
conv->conv_from = conv_32_to_pixel_fast;
} else {
conv->conv_from = conv_32_to_pixel_generic;
}
break;
default:
goto err;
}
switch (conv->dst.bytes_per_pixel) {
case 2:
conv->conv_to = conv_pixel_to_16;
break;
case 4:
conv->conv_to = conv_pixel_to_32;
break;
default:
goto err;
}
conv->convert = convert_generic;
}
return conv;
err:
g_free(conv);
return NULL;
}
void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
{
conv->convert(conv, dst, src, cnt);
}
void qemu_pf_conv_put(QemuPfConv *conv)
{
if (conv) {
g_free(conv->conv_buf);
g_free(conv);
}
}
