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add pflib: PixelFormat conversion library.

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1 parent 526c523 commit d6d94fc327af7e7c1343c091317e1ed8786906ad @kraxel kraxel committed Jun 14, 2010
Showing with 234 additions and 0 deletions.
  1. +1 −0 Makefile.objs
  2. +213 −0 pflib.c
  3. +20 −0 pflib.h
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1 Makefile.objs
@@ -83,6 +83,7 @@ common-obj-y += qemu-char.o savevm.o #aio.o
common-obj-y += msmouse.o ps2.o
common-obj-y += qdev.o qdev-properties.o
common-obj-y += block-migration.o
+common-obj-y += pflib.o
common-obj-$(CONFIG_BRLAPI) += baum.o
common-obj-$(CONFIG_POSIX) += migration-exec.o migration-unix.o migration-fd.o
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213 pflib.c
@@ -0,0 +1,213 @@
+/*
+ * 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.
+ *
+ */
+#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 = qemu_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 = qemu_mallocz(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:
+ qemu_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) {
+ qemu_free(conv->conv_buf);
+ qemu_free(conv);
+ }
+}
View
20 pflib.h
@@ -0,0 +1,20 @@
+#ifndef __QEMU_PFLIB_H
+#define __QEMU_PFLIB_H
+
+/*
+ * 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.
+ *
+ */
+
+typedef struct QemuPfConv QemuPfConv;
+
+QemuPfConv *qemu_pf_conv_get(PixelFormat *dst, PixelFormat *src);
+void qemu_pf_conv_run(QemuPfConv *conv, void *dst, void *src, uint32_t cnt);
+void qemu_pf_conv_put(QemuPfConv *conv);
+
+#endif

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