Archipelago » qemu

/*

 * 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);

    }

}