add pflib: PixelFormat conversion library.
This commit is contained in:
Gerd Hoffmann
parent
526c523781
commit
d6d94fc327
@ -83,6 +83,7 @@ common-obj-y += qemu-char.o savevm.o #aio.o
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common-obj-y += msmouse.o ps2.o
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common-obj-y += qdev.o qdev-properties.o
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common-obj-y += block-migration.o
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common-obj-y += pflib.o
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common-obj-$(CONFIG_BRLAPI) += baum.o
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common-obj-$(CONFIG_POSIX) += migration-exec.o migration-unix.o migration-fd.o
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213
pflib.c
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213
pflib.c
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/*
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* PixelFormat conversion library.
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*
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* Author: Gerd Hoffmann <kraxel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "console.h"
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#include "pflib.h"
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typedef struct QemuPixel QemuPixel;
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typedef void (*pf_convert)(QemuPfConv *conv,
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void *dst, void *src, uint32_t cnt);
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typedef void (*pf_convert_from)(PixelFormat *pf,
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QemuPixel *dst, void *src, uint32_t cnt);
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typedef void (*pf_convert_to)(PixelFormat *pf,
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void *dst, QemuPixel *src, uint32_t cnt);
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struct QemuPfConv {
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pf_convert convert;
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PixelFormat src;
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PixelFormat dst;
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/* for copy_generic() */
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pf_convert_from conv_from;
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pf_convert_to conv_to;
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QemuPixel *conv_buf;
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uint32_t conv_cnt;
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};
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struct QemuPixel {
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uint8_t red;
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uint8_t green;
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uint8_t blue;
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uint8_t alpha;
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};
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/* ----------------------------------------------------------------------- */
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/* PixelFormat -> QemuPixel conversions */
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static void conv_16_to_pixel(PixelFormat *pf,
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QemuPixel *dst, void *src, uint32_t cnt)
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{
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uint16_t *src16 = src;
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while (cnt > 0) {
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dst->red = ((*src16 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
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dst->green = ((*src16 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
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dst->blue = ((*src16 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
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dst->alpha = ((*src16 & pf->amask) >> pf->ashift) << (8 - pf->abits);
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dst++, src16++, cnt--;
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}
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}
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/* assumes pf->{r,g,b,a}bits == 8 */
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static void conv_32_to_pixel_fast(PixelFormat *pf,
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QemuPixel *dst, void *src, uint32_t cnt)
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{
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uint32_t *src32 = src;
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while (cnt > 0) {
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dst->red = (*src32 & pf->rmask) >> pf->rshift;
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dst->green = (*src32 & pf->gmask) >> pf->gshift;
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dst->blue = (*src32 & pf->bmask) >> pf->bshift;
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dst->alpha = (*src32 & pf->amask) >> pf->ashift;
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dst++, src32++, cnt--;
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}
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}
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static void conv_32_to_pixel_generic(PixelFormat *pf,
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QemuPixel *dst, void *src, uint32_t cnt)
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{
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uint32_t *src32 = src;
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while (cnt > 0) {
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if (pf->rbits < 8) {
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dst->red = ((*src32 & pf->rmask) >> pf->rshift) << (8 - pf->rbits);
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} else {
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dst->red = ((*src32 & pf->rmask) >> pf->rshift) >> (pf->rbits - 8);
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}
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if (pf->gbits < 8) {
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dst->green = ((*src32 & pf->gmask) >> pf->gshift) << (8 - pf->gbits);
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} else {
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dst->green = ((*src32 & pf->gmask) >> pf->gshift) >> (pf->gbits - 8);
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}
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if (pf->bbits < 8) {
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dst->blue = ((*src32 & pf->bmask) >> pf->bshift) << (8 - pf->bbits);
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} else {
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dst->blue = ((*src32 & pf->bmask) >> pf->bshift) >> (pf->bbits - 8);
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}
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if (pf->abits < 8) {
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dst->alpha = ((*src32 & pf->amask) >> pf->ashift) << (8 - pf->abits);
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} else {
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dst->alpha = ((*src32 & pf->amask) >> pf->ashift) >> (pf->abits - 8);
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}
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dst++, src32++, cnt--;
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}
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}
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/* ----------------------------------------------------------------------- */
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/* QemuPixel -> PixelFormat conversions */
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static void conv_pixel_to_16(PixelFormat *pf,
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void *dst, QemuPixel *src, uint32_t cnt)
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{
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uint16_t *dst16 = dst;
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while (cnt > 0) {
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*dst16 = ((uint16_t)src->red >> (8 - pf->rbits)) << pf->rshift;
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*dst16 |= ((uint16_t)src->green >> (8 - pf->gbits)) << pf->gshift;
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*dst16 |= ((uint16_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
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*dst16 |= ((uint16_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
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dst16++, src++, cnt--;
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}
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}
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static void conv_pixel_to_32(PixelFormat *pf,
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void *dst, QemuPixel *src, uint32_t cnt)
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{
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uint32_t *dst32 = dst;
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while (cnt > 0) {
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*dst32 = ((uint32_t)src->red >> (8 - pf->rbits)) << pf->rshift;
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*dst32 |= ((uint32_t)src->green >> (8 - pf->gbits)) << pf->gshift;
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*dst32 |= ((uint32_t)src->blue >> (8 - pf->bbits)) << pf->bshift;
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*dst32 |= ((uint32_t)src->alpha >> (8 - pf->abits)) << pf->ashift;
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dst32++, src++, cnt--;
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}
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}
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/* ----------------------------------------------------------------------- */
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/* PixelFormat -> PixelFormat conversions */
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static void convert_copy(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
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{
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uint32_t bytes = cnt * conv->src.bytes_per_pixel;
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memcpy(dst, src, bytes);
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}
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static void convert_generic(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
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{
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if (conv->conv_cnt < cnt) {
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conv->conv_cnt = cnt;
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conv->conv_buf = qemu_realloc(conv->conv_buf, sizeof(QemuPixel) * conv->conv_cnt);
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}
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conv->conv_from(&conv->src, conv->conv_buf, src, cnt);
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conv->conv_to(&conv->dst, dst, conv->conv_buf, cnt);
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}
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/* ----------------------------------------------------------------------- */
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/* public interface */
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QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src)
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{
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QemuPfConv *conv = qemu_mallocz(sizeof(QemuPfConv));
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conv->src = *src;
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conv->dst = *dst;
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if (memcmp(&conv->src, &conv->dst, sizeof(PixelFormat)) == 0) {
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/* formats identical, can simply copy */
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conv->convert = convert_copy;
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} else {
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/* generic two-step conversion: src -> QemuPixel -> dst */
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switch (conv->src.bytes_per_pixel) {
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case 2:
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conv->conv_from = conv_16_to_pixel;
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break;
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case 4:
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if (conv->src.rbits == 8 && conv->src.gbits == 8 && conv->src.bbits == 8) {
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conv->conv_from = conv_32_to_pixel_fast;
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} else {
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conv->conv_from = conv_32_to_pixel_generic;
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}
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break;
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default:
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goto err;
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}
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switch (conv->dst.bytes_per_pixel) {
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case 2:
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conv->conv_to = conv_pixel_to_16;
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break;
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case 4:
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conv->conv_to = conv_pixel_to_32;
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break;
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default:
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goto err;
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}
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conv->convert = convert_generic;
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}
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return conv;
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err:
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qemu_free(conv);
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return NULL;
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}
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void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt)
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{
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conv->convert(conv, dst, src, cnt);
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}
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void qemu_pf_conv_put(QemuPfConv *conv)
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{
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if (conv) {
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qemu_free(conv->conv_buf);
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qemu_free(conv);
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}
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}
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20
pflib.h
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20
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@ -0,0 +1,20 @@
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#ifndef __QEMU_PFLIB_H
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#define __QEMU_PFLIB_H
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/*
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* PixelFormat conversion library.
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*
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* Author: Gerd Hoffmann <kraxel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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typedef struct QemuPfConv QemuPfConv;
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QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src);
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void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt);
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void qemu_pf_conv_put(QemuPfConv *conv);
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#endif
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