From 09992bc6b432987ed3871dd7e4327ab6a589b865 Mon Sep 17 00:00:00 2001

From: Gerd Hoffmann <kraxel@redhat.com>

Date: Mon, 14 Jun 2010 09:54:27 +0200

Subject: [PATCH 01/39] add pflib: PixelFormat conversion library.

---

 Makefile.objs |    1 +

 pflib.c       |  213 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++

 pflib.h       |    6 ++

 3 files changed, 220 insertions(+), 0 deletions(-)

 create mode 100644 pflib.c

 create mode 100644 pflib.h

diff --git a/Makefile.objs b/Makefile.objs

index dbee210..147051f 100644

--- a/Makefile.objs

+++ b/Makefile.objs

@@ -84,6 +84,7 @@ 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

diff --git a/pflib.c b/pflib.c

new file mode 100644

index 0000000..1154d0c

--- /dev/null

+++ b/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);

+    }

+}

diff --git a/pflib.h b/pflib.h

new file mode 100644

index 0000000..8d73fdd

--- /dev/null

+++ b/pflib.h

@@ -0,0 +1,6 @@

+/* public */

+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);

-- 

1.7.2.3