path: root/common/canvas_base.c

/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
   Copyright (C) 2009 Red Hat, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdarg.h>
#include <cairo.h>
#include <stdlib.h>
#include <setjmp.h>
#include <stdio.h>

#include <spice/draw.h>
#include "quic.h"
#include "lz.h"
#include "canvas_base.h"
#include "canvas_utils.h"
#include "rect.h"

#include "mutex.h"

#ifndef CANVAS_ERROR
#define CANVAS_ERROR(format, ...) {                             \
    printf("%s: " format "\n", __FUNCTION__, ## __VA_ARGS__);   \
    abort();                                                    \
}
#endif

#ifdef CAIRO_CANVAS_ACCESS_TEST
#define access_test(cancas, ptr, size)                                                         \
    if ((unsigned long)(ptr) < (cancas)->base ||                                               \
                                            (unsigned long)(ptr) + (size) > (cancas)->max) {   \
        CANVAS_ERROR("access violation 0x%lx %lu", (unsigned long)ptr, (unsigned long)(size)); \
    }
#else
#define access_test(cancas, base, size)
#endif

#ifndef ASSERT
#define ASSERT(x) if (!(x)) {                               \
    printf("%s: ASSERT %s failed\n", __FUNCTION__, #x);     \
    abort();                                                \
}
#endif

#ifndef WARN
#define WARN(x) printf("warning: %s\n", x)
#endif

#ifndef DBG
#define DBG(level, format, ...) printf("%s: debug: " format "\n", __FUNCTION__, ## __VA_ARGS__);
#endif

#ifndef ALIGN
#define ALIGN(a, b) (((a) + ((b) - 1)) & ~((b) - 1))
#endif

#ifndef MIN
#define MIN(x, y) (((x) <= (y)) ? (x) : (y))
#endif

#ifndef MAX
#define MAX(x, y) (((x) >= (y)) ? (x) : (y))
#endif

#ifdef WIN32
typedef struct  __declspec (align(1)) LZImage {
#else
typedef struct __attribute__ ((__packed__)) LZImage {
#endif
    SpiceImageDescriptor descriptor;
    union {
        SpiceLZRGBData lz_rgb;
        SpiceLZPLTData lz_plt;
    };
} LZImage;

static const cairo_user_data_key_t invers_data_type = {0};

#ifdef CAIRO_CANVAS_CACH_IS_SHARED
/* should be defined and initialized once in application.cpp */
extern mutex_t cairo_surface_user_data_mutex;
#endif

static inline double fix_to_double(SPICE_FIXED28_4 fixed)
{
    return (double)(fixed & 0x0f) / 0x0f + (fixed >> 4);
}

static inline uint32_t canvas_16bpp_to_32bpp(uint32_t color)
{
    uint32_t ret;

    ret = ((color & 0x001f) << 3) | ((color & 0x001c) >> 2);
    ret |= ((color & 0x03e0) << 6) | ((color & 0x0380) << 1);
    ret |= ((color & 0x7c00) << 9) | ((color & 0x7000) << 4);

    return ret;
}

static inline int test_bit(void* addr, int bit)
{
    return !!(((uint32_t*)addr)[bit >> 5] & (1 << (bit & 0x1f)));
}

static inline int test_bit_be(void* addr, int bit)
{
    return !!(((uint8_t*)addr)[bit >> 3] & (0x80 >> (bit & 0x07)));
}

#ifdef WIN32
static HDC create_compatible_dc()
{
    HDC dc = CreateCompatibleDC(NULL);
    if (!dc) {
        CANVAS_ERROR("create compatible DC failed");
    }
    return dc;
}

#endif

typedef struct LzData {
    LzUsrContext usr;
    LzContext *lz;
    LzDecodeUsrData decode_data;
    jmp_buf jmp_env;
    char message_buf[512];
} LzData;

typedef struct GlzData {
    void                  *decoder_opaque;
    glz_decode_fn_t decode;
    LzDecodeUsrData decode_data;
} GlzData;

typedef struct QuicData {
    QuicUsrContext usr;
    QuicContext *quic;
    jmp_buf jmp_env;
#ifndef CAIRO_CANVAS_NO_CHUNKS
    SPICE_ADDRESS next;
    get_virt_fn_t get_virt;
    void *get_virt_opaque;
    validate_virt_fn_t validate_virt;
    void *validate_virt_opaque;
#endif
    char message_buf[512];
} QuicData;

typedef struct CanvasBase {
    uint32_t color_shift;
    uint32_t color_mask;
    QuicData quic_data;
#ifdef CAIRO_CANVAS_ACCESS_TEST
    unsigned long base;
    unsigned long max;
#endif

#if defined(CAIRO_CANVAS_CACHE) || defined(CAIRO_CANVAS_IMAGE_CACHE)
    void *bits_cache_opaque;
    bits_cache_put_fn_t bits_cache_put;
    bits_cache_get_fn_t bits_cache_get;
#endif
#ifdef CAIRO_CANVAS_CACHE
    void *palette_cache_opaque;
    palette_cache_put_fn_t palette_cache_put;
    palette_cache_get_fn_t palette_cache_get;
    palette_cache_release_fn_t palette_cache_release;
#endif
#ifdef WIN32
    HDC dc;
#endif

    LzData lz_data;
    GlzData glz_data;
} CanvasBase;


#ifndef CAIRO_CANVAS_NO_CHUNKS

#ifdef __GNUC__
#define ATTR_PACKED __attribute__ ((__packed__))
#else
#pragma pack(push)
#pragma pack(1)
#define ATTR_PACKED
#endif

typedef struct ATTR_PACKED DataChunk {
    uint32_t size;
    SPICE_ADDRESS prev;
    SPICE_ADDRESS next;
    uint8_t data[0];
} DataChunk;

#undef ATTR_PACKED

#ifndef __GNUC__
#pragma pack(pop)
#endif

#endif


static inline void canvas_localize_palette(CanvasBase *canvas, SpicePalette *palette)
{
    if (canvas->color_shift == 5) {
        uint32_t *now = palette->ents;
        uint32_t *end = now + palette->num_ents;
        for (; now < end; now++) {
            *now = canvas_16bpp_to_32bpp(*now);
        }
    }
}

//#define DEBUG_DUMP_COMPRESS
#ifdef DEBUG_DUMP_COMPRESS
static void dump_surface(cairo_surface_t *surface, int cache);
#endif
static cairo_surface_t *canvas_get_quic(CanvasBase *canvas, SpiceQUICImage *image, int invers)
{
    cairo_surface_t *surface = NULL;
    QuicData *quic_data = &canvas->quic_data;
    QuicImageType type;
    uint8_t *dest;
    int stride;
    int width;
    int height;
    int alpha;
#ifndef CAIRO_CANVAS_NO_CHUNKS
    DataChunk **tmp;
    DataChunk *chunk;
#endif

    if (setjmp(quic_data->jmp_env)) {
        cairo_surface_destroy(surface);
        CANVAS_ERROR("quic error, %s", quic_data->message_buf);
    }

#ifdef CAIRO_CANVAS_NO_CHUNKS
    if (quic_decode_begin(quic_data->quic, (uint32_t *)image->quic.data,
                          image->quic.data_size >> 2, &type, &width, &height) == QUIC_ERROR) {
        CANVAS_ERROR("quic decode begin failed");
    }
#else
    tmp = (DataChunk **)image->quic.data;
    chunk = *tmp;
    quic_data->next = chunk->next;
    if (quic_decode_begin(quic_data->quic, (uint32_t *)chunk->data, chunk->size >> 2,
                          &type, &width, &height) == QUIC_ERROR) {
        CANVAS_ERROR("quic decode begin failed");
    }
#endif

    switch (type) {
    case QUIC_IMAGE_TYPE_RGBA:
        alpha = 1;
        break;
    case QUIC_IMAGE_TYPE_RGB32:
    case QUIC_IMAGE_TYPE_RGB24:
    case QUIC_IMAGE_TYPE_RGB16:
        alpha = 0;
        break;
    case QUIC_IMAGE_TYPE_INVALID:
    case QUIC_IMAGE_TYPE_GRAY:
    default:
        CANVAS_ERROR("unexpected image type");
    }

    ASSERT((uint32_t)width == image->descriptor.width);
    ASSERT((uint32_t)height == image->descriptor.height);

    surface = surface_create(
#ifdef WIN32
                             canvas->dc,
#endif
                             alpha ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
                             width, height, FALSE);

    if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(surface)));
    }

    dest = cairo_image_surface_get_data(surface);
    stride = cairo_image_surface_get_stride(surface);
    if (quic_decode(quic_data->quic, alpha ? QUIC_IMAGE_TYPE_RGBA : QUIC_IMAGE_TYPE_RGB32,
                    dest, stride) == QUIC_ERROR) {
        CANVAS_ERROR("quic decode failed");
    }

    if (invers) {
        uint8_t *end = dest + height * stride;
        for (; dest != end; dest += stride) {
            uint32_t *pix;
            uint32_t *end_pix;

            pix = (uint32_t *)dest;
            end_pix = pix + width;
            for (; pix < end_pix; pix++) {
                *pix ^= 0x00ffffff;
            }
        }
    }

#ifdef DEBUG_DUMP_COMPRESS
    dump_surface(surface, 0);
#endif
    return surface;
}

static inline void canvas_copy_32bpp(uint8_t* dest, int dest_stride, uint8_t* src, int src_stride,
                                     int width, uint8_t* end)
{
    for (; src != end; src += src_stride, dest += dest_stride) {
        memcpy(dest, src, width << 2);
    }
}

static inline void canvas_copy_24bpp(uint8_t* dest, int dest_stride, uint8_t* src, int src_stride,
                                     int width, uint8_t* end)
{
    for (; src != end; src += src_stride, dest += dest_stride) {
        uint8_t* src_line = src;
        uint8_t* src_line_end = src_line + width * 3;
        uint8_t* dest_line = dest;

        for (; src_line < src_line_end; ++dest_line) {
            *(dest_line++) = *(src_line++);
            *(dest_line++) = *(src_line++);
            *(dest_line++) = *(src_line++);
        }
    }
}

static inline void canvas_copy_16bpp(uint8_t* dest, int dest_stride, uint8_t* src, int src_stride,
                                     int width, uint8_t* end)
{
    for (; src != end; src += src_stride, dest += dest_stride) {
        uint16_t* src_line = (uint16_t*)src;
        uint16_t* src_line_end = src_line + width;
        uint32_t* dest_line = (uint32_t*)dest;

        for (; src_line < src_line_end; ++dest_line, src_line++) {
            *dest_line = canvas_16bpp_to_32bpp(*src_line);
        }
    }
}

static inline void canvas_copy_8bpp(uint8_t *dest, int dest_stride, uint8_t *src, int src_stride,
                                    int width, uint8_t *end, SpicePalette *palette)
{
    if (!palette) {
        CANVAS_ERROR("no palette");
    }

    for (; src != end; src += src_stride, dest += dest_stride) {
        uint32_t *dest_line = (uint32_t*)dest;
        uint8_t *src_line = src;
        uint8_t *src_line_end = src_line + width;

        while (src_line < src_line_end) {
            ASSERT(*src_line < palette->num_ents);
            *(dest_line++) = palette->ents[*(src_line++)];
        }
    }
}

static inline void canvas_copy_4bpp_be(uint8_t* dest, int dest_stride, uint8_t* src, int src_stride,
                                       int width, uint8_t* end, SpicePalette *palette)
{
    if (!palette) {
        CANVAS_ERROR("no palette");
    }

    for (; src != end; src += src_stride, dest += dest_stride) {
        uint32_t *dest_line = (uint32_t *)dest;
        uint8_t *now = src;
        int i;

        for (i = 0; i < (width >> 1); i++) {
            ASSERT((*now & 0x0f) < palette->num_ents);
            ASSERT(((*now >> 4) & 0x0f) < palette->num_ents);
            *(dest_line++) = palette->ents[(*now >> 4) & 0x0f];
            *(dest_line++) = palette->ents[*(now++) & 0x0f];
        }
        if (width & 1) {
            *(dest_line) = palette->ents[(*src >> 4) & 0x0f];
        }
    }
}

static inline void canvas_copy_1bpp_be(uint8_t* dest, int dest_stride, uint8_t* src, int src_stride,
                                       int width, uint8_t* end, SpicePalette *palette)
{
    uint32_t fore_color;
    uint32_t back_color;

    if (!palette) {
        CANVAS_ERROR("no palette");
    }

    fore_color = palette->ents[1];
    back_color = palette->ents[0];

    for (; src != end; src += src_stride, dest += dest_stride) {
        uint32_t* dest_line = (uint32_t*)dest;
        int i;

        for (i = 0; i < width; i++) {
            if (test_bit_be(src, i)) {
                *(dest_line++) = fore_color;
            } else {
                *(dest_line++) = back_color;
            }
        }
    }
}

static cairo_surface_t *canvas_bitmap_to_surface(CanvasBase *canvas, SpiceBitmap* bitmap,
                                                 SpicePalette *palette)
{
    uint8_t* src = (uint8_t *)SPICE_GET_ADDRESS(bitmap->data);
    int src_stride;
    uint8_t* end;
    uint8_t* dest;
    int dest_stride;
    cairo_surface_t* cairo_surface;

    src_stride = bitmap->stride;
    end = src + (bitmap->y * src_stride);
    access_test(canvas, src, bitmap->y * src_stride);

    cairo_surface = surface_create(
#ifdef WIN32
                                   canvas->dc,
#endif
                                   (bitmap->format == SPICE_BITMAP_FMT_RGBA) ? CAIRO_FORMAT_ARGB32 :
                                                                         CAIRO_FORMAT_RGB24,
                                   bitmap->x, bitmap->y, FALSE);
    if (cairo_surface_status(cairo_surface) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(cairo_surface)));
    }
    dest = cairo_image_surface_get_data(cairo_surface);
    dest_stride = cairo_image_surface_get_stride(cairo_surface);
    if (!(bitmap->flags & SPICE_BITMAP_FLAGS_TOP_DOWN)) {
        ASSERT(bitmap->y > 0);
        dest += dest_stride * ((int)bitmap->y - 1);
        dest_stride = -dest_stride;
    }

    switch (bitmap->format) {
    case SPICE_BITMAP_FMT_32BIT:
    case SPICE_BITMAP_FMT_RGBA:
        canvas_copy_32bpp(dest, dest_stride, src, src_stride, bitmap->x, end);
        break;
    case SPICE_BITMAP_FMT_24BIT:
        canvas_copy_24bpp(dest, dest_stride, src, src_stride, bitmap->x, end);
        break;
    case SPICE_BITMAP_FMT_16BIT:
        canvas_copy_16bpp(dest, dest_stride, src, src_stride, bitmap->x, end);
        break;
    case SPICE_BITMAP_FMT_8BIT:
        canvas_copy_8bpp(dest, dest_stride, src, src_stride, bitmap->x, end, palette);
        break;
    case SPICE_BITMAP_FMT_4BIT_BE:
        canvas_copy_4bpp_be(dest, dest_stride, src, src_stride, bitmap->x, end, palette);
        break;
    case SPICE_BITMAP_FMT_1BIT_BE:
        canvas_copy_1bpp_be(dest, dest_stride, src, src_stride, bitmap->x, end, palette);
        break;
    }
    return cairo_surface;
}

#ifdef CAIRO_CANVAS_CACHE

static inline SpicePalette *canvas_get_palett(CanvasBase *canvas, SPICE_ADDRESS base_palette, uint8_t flags)
{
    SpicePalette *palette;
    if (!base_palette) {
        return NULL;
    }

    if (flags & SPICE_BITMAP_FLAGS_PAL_FROM_CACHE) {
        palette = canvas->palette_cache_get(canvas->palette_cache_opaque, base_palette);
    } else if (flags & SPICE_BITMAP_FLAGS_PAL_CACHE_ME) {
        palette = (SpicePalette *)SPICE_GET_ADDRESS(base_palette);
        access_test(canvas, palette, sizeof(SpicePalette));
        access_test(canvas, palette, sizeof(SpicePalette) + palette->num_ents * sizeof(uint32_t));
        canvas_localize_palette(canvas, palette);
        canvas->palette_cache_put(canvas->palette_cache_opaque, palette);
    } else {
        palette = (SpicePalette *)SPICE_GET_ADDRESS(base_palette);
        canvas_localize_palette(canvas, palette);
    }
    return palette;
}

static cairo_surface_t *canvas_get_lz(CanvasBase *canvas, LZImage *image, int invers)
{
    LzData *lz_data = &canvas->lz_data;
    uint8_t *comp_buf = NULL;
    int comp_size;
    uint8_t    *decomp_buf = NULL;
    uint8_t    *src;
    LzImageType type;
    SpicePalette *palette;
    int alpha;
    int n_comp_pixels;
    int width;
    int height;
    int top_down;
    int stride;

    if (setjmp(lz_data->jmp_env)) {
        if (decomp_buf) {
            free(decomp_buf);
        }
        CANVAS_ERROR("lz error, %s", lz_data->message_buf);
    }

    if (image->descriptor.type == SPICE_IMAGE_TYPE_LZ_RGB) {
        comp_buf = image->lz_rgb.data;
        comp_size = image->lz_rgb.data_size;
        palette = NULL;
    } else if (image->descriptor.type == SPICE_IMAGE_TYPE_LZ_PLT) {
        comp_buf = image->lz_plt.data;
        comp_size = image->lz_plt.data_size;
        palette = canvas_get_palett(canvas, image->lz_plt.palette, image->lz_plt.flags);
    } else {
        CANVAS_ERROR("unexpected image type");
    }

    lz_decode_begin(lz_data->lz, comp_buf, comp_size, &type,
                    &width, &height, &n_comp_pixels, &top_down, palette);

    switch (type) {
    case LZ_IMAGE_TYPE_RGBA:
        alpha = 1;
        break;
    case LZ_IMAGE_TYPE_RGB32:
    case LZ_IMAGE_TYPE_RGB24:
    case LZ_IMAGE_TYPE_RGB16:
    case LZ_IMAGE_TYPE_PLT1_LE:
    case LZ_IMAGE_TYPE_PLT1_BE:
    case LZ_IMAGE_TYPE_PLT4_LE:
    case LZ_IMAGE_TYPE_PLT4_BE:
    case LZ_IMAGE_TYPE_PLT8:
        alpha = 0;
        break;
    default:
        CANVAS_ERROR("unexpected LZ image type");
    }

    ASSERT(width == image->descriptor.width);
    ASSERT(height == image->descriptor.height);

    ASSERT((image->descriptor.type == SPICE_IMAGE_TYPE_LZ_PLT) || (n_comp_pixels == width * height));
#ifdef WIN32
    lz_data->decode_data.dc = canvas->dc;
#endif


    alloc_lz_image_surface(&lz_data->decode_data, alpha ? LZ_IMAGE_TYPE_RGBA : LZ_IMAGE_TYPE_RGB32,
                           width, height, n_comp_pixels, top_down);

    src = cairo_image_surface_get_data(lz_data->decode_data.out_surface);

    stride = (n_comp_pixels / height) * 4;
    if (!top_down) {
        stride = -stride;
        decomp_buf = src + stride * (height - 1);
    } else {
        decomp_buf = src;
    }

    lz_decode(lz_data->lz, alpha ? LZ_IMAGE_TYPE_RGBA : LZ_IMAGE_TYPE_RGB32, decomp_buf);

    if (invers) {
        uint8_t *line = src;
        uint8_t *end = src + height * stride;
        for (; line != end; line += stride) {
            uint32_t *pix;
            uint32_t *end_pix;

            pix = (uint32_t *)line;
            end_pix = pix + width;
            for (; pix < end_pix; pix++) {
                *pix ^= 0x00ffffff;
            }
        }
    }

    return lz_data->decode_data.out_surface;
}

// don't handle plts since bitmaps with plt can be decoded globaly to RGB32 (because
// same byte sequence can be transformed to different RGB pixels by different plts)
static cairo_surface_t *canvas_get_glz(CanvasBase *canvas, LZImage *image)
{
    ASSERT(image->descriptor.type == SPICE_IMAGE_TYPE_GLZ_RGB);
#ifdef WIN32
    canvas->glz_data.decode_data.dc = canvas->dc;
#endif
    canvas->glz_data.decode(canvas->glz_data.decoder_opaque, image->lz_rgb.data, NULL,
                            &canvas->glz_data.decode_data);
    /* global_decode calls alloc_lz_image, which sets canvas->glz_data.surface */
    return (canvas->glz_data.decode_data.out_surface);
}

//#define DEBUG_DUMP_BITMAP

#ifdef DEBUG_DUMP_BITMAP
static void dump_bitmap(SpiceBitmap *bitmap, SpicePalette *palette)
{
    uint8_t* data = (uint8_t *)SPICE_GET_ADDRESS(bitmap->data);
    static uint32_t file_id = 0;
    uint32_t i, j;
    char file_str[200];
    uint32_t id = ++file_id;

#ifdef WIN32
    sprintf(file_str, "c:\\tmp\\spice_dump\\%u.%ubpp", id, bitmap->format);
#else
    sprintf(file_str, "/tmp/spice_dump/%u.%ubpp", id, bitmap->format);
#endif
    FILE *f = fopen(file_str, "wb");
    if (!f) {
        return;
    }

    fprintf(f, "%d\n", bitmap->format);                          // 1_LE,1_BE,....
    fprintf(f, "%d %d\n", bitmap->x, bitmap->y);     // width and height
    fprintf(f, "%d\n", palette->num_ents);               // #plt entries
    for (i = 0; i < palette->num_ents; i++) {
        fwrite(&(palette->ents[i]), 4, 1, f);
    }
    fprintf(f, "\n");

    for (i = 0; i < bitmap->y; i++, data += bitmap->stride) {
        uint8_t *now = data;
        for (j = 0; j < bitmap->x; j++) {
            fwrite(now, 1, 1, f);
            now++;
        }
    }
}

#endif

static cairo_surface_t *canvas_get_bits(CanvasBase *canvas, SpiceBitmap *bitmap)
{
    cairo_surface_t* surface;
    SpicePalette *palette;

    palette = canvas_get_palett(canvas, bitmap->palette, bitmap->flags);
#ifdef DEBUG_DUMP_BITMAP
    if (palette) {
        dump_bitmap(bitmap, palette);
    }
#endif

    surface = canvas_bitmap_to_surface(canvas, bitmap, palette);

    if (palette && (bitmap->flags & SPICE_BITMAP_FLAGS_PAL_FROM_CACHE)) {
        canvas->palette_cache_release(palette);
    }

    return surface;
}

#else


static cairo_surface_t *canvas_get_bits(CanvasBase *canvas, SpiceBitmap *bitmap)
{
    SpicePalette *palette;

    if (!bitmap->palette) {
        return canvas_bitmap_to_surface(canvas, bitmap, NULL);
    }
    palette = (SpicePalette *)SPICE_GET_ADDRESS(bitmap->palette);
    if (canvas->color_shift == 5) {
        int size = sizeof(SpicePalette) + (palette->num_ents << 2);
        SpicePalette *local_palette = malloc(size);
        cairo_surface_t* surface;

        memcpy(local_palette, palette, size);
        canvas_localize_palette(canvas, local_palette);
        surface = canvas_bitmap_to_surface(canvas, bitmap, local_palette);
        free(local_palette);
        return surface;
    } else {
        return canvas_bitmap_to_surface(canvas, bitmap, palette);
    }
}

#endif



// caution: defining DEBUG_DUMP_SURFACE will dump both cached & non-cached
//          images to disk. it will reduce performance dramatically & eat
//          disk space rapidly. use it only for debugging.
//#define DEBUG_DUMP_SURFACE

#if defined(DEBUG_DUMP_SURFACE) || defined(DEBUG_DUMP_COMPRESS)

static void dump_surface(cairo_surface_t *surface, int cache)
{
    static uint32_t file_id = 0;
    int i, j;
    char file_str[200];
    cairo_format_t format = cairo_image_surface_get_format(surface);

    if (format != CAIRO_FORMAT_RGB24 && format != CAIRO_FORMAT_ARGB32) {
        return;
    }

    uint8_t *data = cairo_image_surface_get_data(surface);
    int width = cairo_image_surface_get_width(surface);
    int height = cairo_image_surface_get_height(surface);
    int stride = cairo_image_surface_get_stride(surface);

    uint32_t id = ++file_id;
#ifdef WIN32
    sprintf(file_str, "c:\\tmp\\spice_dump\\%d\\%u.ppm", cache, id);
#else
    sprintf(file_str, "/tmp/spice_dump/%u.ppm", id);
#endif
    FILE *f = fopen(file_str, "wb");
    if (!f) {
        return;
    }
    fprintf(f, "P6\n");
    fprintf(f, "%d %d\n", width, height);
    fprintf(f, "#spicec dump\n");
    fprintf(f, "255\n");
    for (i = 0; i < height; i++, data += stride) {
        uint8_t *now = data;
        for (j = 0; j < width; j++) {
            fwrite(&now[2], 1, 1, f);
            fwrite(&now[1], 1, 1, f);
            fwrite(&now[0], 1, 1, f);
            now += 4;
        }
    }
    fclose(f);
}

#endif

#if defined(CAIRO_CANVAS_CACHE) || defined(CAIRO_CANVAS_IMAGE_CACHE)

static void __release_surface(void *inv_surf)
{
    cairo_surface_destroy((cairo_surface_t *)inv_surf);
}

//#define DEBUG_LZ

static cairo_surface_t *canvas_get_image(CanvasBase *canvas, SPICE_ADDRESS addr)
{
    SpiceImageDescriptor *descriptor = (SpiceImageDescriptor *)SPICE_GET_ADDRESS(addr);
    cairo_surface_t *surface;
    access_test(canvas, descriptor, sizeof(SpiceImageDescriptor));
#ifdef DEBUG_LZ
    LOG_DEBUG("canvas_get_image image type: " << (int)descriptor->type);
#endif

    switch (descriptor->type) {
    case SPICE_IMAGE_TYPE_QUIC: {
        SpiceQUICImage *image = (SpiceQUICImage *)descriptor;
        access_test(canvas, descriptor, sizeof(SpiceQUICImage));
        surface = canvas_get_quic(canvas, image, 0);
        break;
    }
#ifdef CAIRO_CANVAS_NO_CHUNKS
    case SPICE_IMAGE_TYPE_LZ_PLT: {
        access_test(canvas, descriptor, sizeof(SpiceLZPLTImage));
        LZImage *image = (LZImage *)descriptor;
        surface = canvas_get_lz(canvas, image, 0);
        break;
    }
    case SPICE_IMAGE_TYPE_LZ_RGB: {
        access_test(canvas, descriptor, sizeof(SpiceLZRGBImage));
        LZImage *image = (LZImage *)descriptor;
        surface = canvas_get_lz(canvas, image, 0);
        break;
    }
#endif
#ifdef USE_GLZ
    case SPICE_IMAGE_TYPE_GLZ_RGB: {
        access_test(canvas, descriptor, sizeof(SpiceLZRGBImage));
        LZImage *image = (LZImage *)descriptor;
        surface = canvas_get_glz(canvas, image);
        break;
    }
#endif
    case SPICE_IMAGE_TYPE_FROM_CACHE:
        return canvas->bits_cache_get(canvas->bits_cache_opaque, descriptor->id);
    case SPICE_IMAGE_TYPE_BITMAP: {
        SpiceBitmapImage *bitmap = (SpiceBitmapImage *)descriptor;
        access_test(canvas, descriptor, sizeof(SpiceBitmapImage));
        surface = canvas_get_bits(canvas, &bitmap->bitmap);
        break;
    }
    default:
        CANVAS_ERROR("invalid image type");
    }

    if (descriptor->flags & SPICE_IMAGE_FLAGS_CACHE_ME) {
        canvas->bits_cache_put(canvas->bits_cache_opaque, descriptor->id, surface);
#ifdef DEBUG_DUMP_SURFACE
        dump_surface(surface, 1);
#endif
    } else if (descriptor->type != SPICE_IMAGE_TYPE_FROM_CACHE) {
#ifdef DEBUG_DUMP_SURFACE
        dump_surface(surface, 0);
#endif
    }
    return surface;
}

#else

static cairo_surface_t *canvas_get_image(CairoCanvas *canvas, SPICE_ADDRESS addr)
{
    SpiceImageDescriptor *descriptor = (SpiceImageDescriptor *)SPICE_GET_ADDRESS(addr);

    access_test(canvas, descriptor, sizeof(SpiceImageDescriptor));

    switch (descriptor->type) {
    case SPICE_IMAGE_TYPE_QUIC: {
        SpiceQUICImage *image = (SpiceQUICImage *)descriptor;
        access_test(canvas, descriptor, sizeof(SpiceQUICImage));
        return canvas_get_quic(canvas, image, 0);
    }
    case SPICE_IMAGE_TYPE_BITMAP: {
        SpiceBitmapImage *bitmap = (SpiceBitmapImage *)descriptor;
        access_test(canvas, descriptor, sizeof(SpiceBitmapImage));
        return canvas_get_bits(canvas, &bitmap->bitmap);
    }
    default:
        CANVAS_ERROR("invalid image type");
    }
}

#endif

static inline uint8_t revers_bits(uint8_t byte)
{
    uint8_t ret = 0;
    int i;

    for (i = 0; i < 4; i++) {
        int shift = 7 - i * 2;
        ret |= (byte & (1 << i)) << shift;
        ret |= (byte & (0x80 >> i)) >> shift;
    }
    return ret;
}

static cairo_surface_t *canvas_get_bitmap_mask(CanvasBase *canvas, SpiceBitmap* bitmap, int invers)
{
    cairo_surface_t *surface;
    uint8_t *src_line;
    uint8_t *end_line;
    uint8_t *dest_line;
    int src_stride;
    int line_size;
    int dest_stride;

    surface = surface_create(
#ifdef WIN32
            canvas->dc,
#endif
            CAIRO_FORMAT_A1, bitmap->x, bitmap->y, TRUE);
    if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(surface)));
    }

    src_line = (uint8_t *)SPICE_GET_ADDRESS(bitmap->data);
    src_stride = bitmap->stride;
    end_line = src_line + (bitmap->y * src_stride);
    access_test(canvas, src_line, end_line - src_line);
    line_size = ALIGN(bitmap->x, 8) >> 3;

    dest_stride = cairo_image_surface_get_stride(surface);
    dest_line = cairo_image_surface_get_data(surface);
#if defined(GL_CANVAS)
    if ((bitmap->flags & SPICE_BITMAP_FLAGS_TOP_DOWN)) {
#else
    if (!(bitmap->flags & SPICE_BITMAP_FLAGS_TOP_DOWN)) {
#endif
        ASSERT(bitmap->y > 0);
        dest_line += dest_stride * ((int)bitmap->y - 1);
        dest_stride = -dest_stride;
    }

    if (invers) {
        switch (bitmap->format) {
#if defined(GL_CANVAS) || defined(GDI_CANVAS)
        case SPICE_BITMAP_FMT_1BIT_BE:
#else
        case SPICE_BITMAP_FMT_1BIT_LE:
#endif
            for (; src_line != end_line; src_line += src_stride, dest_line += dest_stride) {
                uint8_t *dest = dest_line;
                uint8_t *now = src_line;
                uint8_t *end = now + line_size;
                while (now < end) {
                    *(dest++) = ~*(now++);
                }
            }
            break;
#if defined(GL_CANVAS) || defined(GDI_CANVAS)
        case SPICE_BITMAP_FMT_1BIT_LE:
#else
        case SPICE_BITMAP_FMT_1BIT_BE:
#endif
            for (; src_line != end_line; src_line += src_stride, dest_line += dest_stride) {
                uint8_t *dest = dest_line;
                uint8_t *now = src_line;
                uint8_t *end = now + line_size;

                while (now < end) {
                    *(dest++) = ~revers_bits(*(now++));
                }
            }
            break;
        default:
            cairo_surface_destroy(surface);
            CANVAS_ERROR("invalid bitmap format");
        }
    } else {
        switch (bitmap->format) {
#if defined(GL_CANVAS) || defined(GDI_CANVAS)
        case SPICE_BITMAP_FMT_1BIT_BE:
#else
        case SPICE_BITMAP_FMT_1BIT_LE:
#endif
            for (; src_line != end_line; src_line += src_stride, dest_line += dest_stride) {
                memcpy(dest_line, src_line, line_size);
            }
            break;
#if defined(GL_CANVAS) || defined(GDI_CANVAS)
        case SPICE_BITMAP_FMT_1BIT_LE:
#else
        case SPICE_BITMAP_FMT_1BIT_BE:
#endif
            for (; src_line != end_line; src_line += src_stride, dest_line += dest_stride) {
                uint8_t *dest = dest_line;
                uint8_t *now = src_line;
                uint8_t *end = now + line_size;

                while (now < end) {
                    *(dest++) = revers_bits(*(now++));
                }
            }
            break;
        default:
            cairo_surface_destroy(surface);
            CANVAS_ERROR("invalid bitmap format");
        }
    }
    return surface;
}

static inline cairo_surface_t *canvas_A1_invers(cairo_surface_t *src_surf)
{
    int width = cairo_image_surface_get_width(src_surf);
    int height = cairo_image_surface_get_height(src_surf);

    cairo_surface_t * invers = cairo_image_surface_create(CAIRO_FORMAT_A1, width, height);
    if (cairo_surface_status(invers) == CAIRO_STATUS_SUCCESS) {
        uint8_t *src_line = cairo_image_surface_get_data(src_surf);
        int src_stride = cairo_image_surface_get_stride(src_surf);
        uint8_t *end_line = src_line + (height * src_stride);
        int line_size = ALIGN(width, 8) >> 3;
        uint8_t *dest_line = cairo_image_surface_get_data(invers);
        int dest_stride = cairo_image_surface_get_stride(invers);

        for (; src_line != end_line; src_line += src_stride, dest_line += dest_stride) {
            uint8_t *dest = dest_line;
            uint8_t *now = src_line;
            uint8_t *end = now + line_size;
            while (now < end) {
                *(dest++) = ~*(now++);
            }
        }
    }
    return invers;
}

static cairo_surface_t *canvas_surf_to_invers(cairo_surface_t *surf)
{
    int width = cairo_image_surface_get_width(surf);
    int height = cairo_image_surface_get_height(surf);
    uint8_t *dest_line;
    uint8_t *dest_line_end;
    uint8_t *src_line;
    int dest_stride;
    int src_stride;

    ASSERT(cairo_image_surface_get_format(surf) == CAIRO_FORMAT_RGB24);
    cairo_surface_t *invers = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);

    if (cairo_surface_status(invers) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(invers)));
    }

    dest_line = cairo_image_surface_get_data(invers);
    dest_stride = cairo_image_surface_get_stride(invers);
    dest_line_end = dest_line + dest_stride * height;
    src_line = cairo_image_surface_get_data(surf);
    src_stride = cairo_image_surface_get_stride(surf);

    for (; dest_line != dest_line_end; dest_line += dest_stride, src_line += src_stride) {
        uint32_t *src = (uint32_t *)src_line;
        uint32_t *dest = (uint32_t *)dest_line;
        uint32_t *end = dest + width;
        while (dest < end) {
            *(dest++) = ~*(src++) & 0x00ffffff;
        }
    }
    return invers;
}

/*
* Return the inversed surface and assigns it to the user data of the given surface.
* The routine also handles the reference count of the inversed surface. It you don't use
* the returned reference, you must call cairo_surface_destroy.
* Thread safe with respect to the user data.
*/
static inline cairo_surface_t* canvas_handle_inverse_user_data(cairo_surface_t* surface)
{
    cairo_surface_t *inv_surf = NULL;
#ifdef CAIRO_CANVAS_CACH_IS_SHARED
    MUTEX_LOCK(cairo_surface_user_data_mutex);
#endif
    inv_surf = (cairo_surface_t *)cairo_surface_get_user_data(surface, &invers_data_type);
#ifdef CAIRO_CANVAS_CACH_IS_SHARED
    MUTEX_UNLOCK(cairo_surface_user_data_mutex);
#endif
    if (!inv_surf) {
        if (cairo_image_surface_get_format(surface) == CAIRO_FORMAT_A1) {
            inv_surf = canvas_A1_invers(surface);
        } else {
            inv_surf = canvas_surf_to_invers(surface);
        }

        if (cairo_surface_status(inv_surf) != CAIRO_STATUS_SUCCESS) {
            cairo_surface_destroy(inv_surf);
            CANVAS_ERROR("create surface failed, %s",
                         cairo_status_to_string(cairo_surface_status(surface)));
        }
#ifdef CAIRO_CANVAS_CACH_IS_SHARED
        MUTEX_LOCK(cairo_surface_user_data_mutex);

        // checking if other thread has already assigned the user data
        if (!cairo_surface_get_user_data(surface, &invers_data_type)) {
#endif
            if (cairo_surface_set_user_data(surface, &invers_data_type, inv_surf,
                                            __release_surface) == CAIRO_STATUS_SUCCESS) {
                cairo_surface_reference(inv_surf);
            }
#ifdef CAIRO_CANVAS_CACH_IS_SHARED
        }
        MUTEX_UNLOCK(cairo_surface_user_data_mutex);
#endif
    } else {
        cairo_surface_reference(inv_surf);
    }

    return inv_surf;
}

static cairo_surface_t *canvas_get_mask(CanvasBase *canvas, SpiceQMask *mask)
{
    SpiceImageDescriptor *descriptor;
    cairo_surface_t *surface;
    int need_invers;
    int is_invers;
    int cache_me;

    if (!mask->bitmap) {
        return NULL;
    }

    descriptor = (SpiceImageDescriptor *)SPICE_GET_ADDRESS(mask->bitmap);
    access_test(canvas, descriptor, sizeof(SpiceImageDescriptor));
    need_invers = mask->flags & SPICE_MASK_FLAGS_INVERS;

#ifdef CAIRO_CANVAS_CACHE
    cache_me = descriptor->flags & SPICE_IMAGE_FLAGS_CACHE_ME;
#else
    cache_me = 0;
#endif

    switch (descriptor->type) {
    case SPICE_IMAGE_TYPE_BITMAP: {
        SpiceBitmapImage *bitmap = (SpiceBitmapImage *)descriptor;
        access_test(canvas, descriptor, sizeof(SpiceBitmapImage));
        is_invers = need_invers && !cache_me;
        surface = canvas_get_bitmap_mask(canvas, &bitmap->bitmap, is_invers);
        break;
    }
#if defined(CAIRO_CANVAS_CACHE) || defined(CAIRO_CANVAS_IMAGE_CACHE)
    case SPICE_IMAGE_TYPE_FROM_CACHE:
        surface = canvas->bits_cache_get(canvas->bits_cache_opaque, descriptor->id);
        is_invers = 0;
        break;
#endif
    default:
        CANVAS_ERROR("invalid image type");
    }

#if defined(CAIRO_CANVAS_CACHE) || defined(CAIRO_CANVAS_IMAGE_CACHE)
    if (cache_me) {
        canvas->bits_cache_put(canvas->bits_cache_opaque, descriptor->id, surface);
    }

    if (need_invers && !is_invers) { // surface is in cache
        cairo_surface_t *inv_surf;

        inv_surf = canvas_handle_inverse_user_data(surface);

        cairo_surface_destroy(surface);
        surface = inv_surf;
    }
#endif
    return surface;
}

static inline SpiceRasterGlyph *canvas_next_raster_glyph(const SpiceRasterGlyph *glyph, int bpp)
{
    return (SpiceRasterGlyph *)((uint8_t *)(glyph + 1) +
                                          (ALIGN(glyph->width * bpp, 8) * glyph->height >> 3));
}

static inline void canvas_raster_glyph_box(const SpiceRasterGlyph *glyph, SpiceRect *r)
{
    ASSERT(r);
    r->top = glyph->render_pos.y + glyph->glyph_origin.y;
    r->bottom = r->top + glyph->height;
    r->left = glyph->render_pos.x + glyph->glyph_origin.x;
    r->right = r->left + glyph->width;
}

#ifdef GL_CANVAS
static inline void __canvas_put_bits(uint8_t *dest, int offset, uint8_t val, int n)
{
    uint8_t mask;
    int now;

    dest = dest + (offset >> 3);
    offset &= 0x07;
    now = MIN(8 - offset, n);

    mask = ~((1 << (8 - now)) - 1);
    mask >>= offset;
    *dest = ((val >> offset) & mask) | *dest;

    if ((n = n - now)) {
        mask = ~((1 << (8 - n)) - 1);
        dest++;
        *dest = ((val << now) & mask) | *dest;
    }
}

#else
static inline void __canvas_put_bits(uint8_t *dest, int offset, uint8_t val, int n)
{
    uint8_t mask;
    int now;

    dest = dest + (offset >> 3);
    offset &= 0x07;

    now = MIN(8 - offset, n);

    mask = (1 << now) - 1;
    mask <<= offset;
    val = revers_bits(val);
    *dest = ((val << offset) & mask) | *dest;

    if ((n = n - now)) {
        mask = (1 << n) - 1;
        dest++;
        *dest = ((val >> now) & mask) | *dest;
    }
}

#endif

static inline void canvas_put_bits(uint8_t *dest, int dest_offset, uint8_t *src, int n)
{
    while (n) {
        int now = MIN(n, 8);

        n -= now;
        __canvas_put_bits(dest, dest_offset, *src, now);
        dest_offset += now;
        src++;
    }
}

static void canvas_put_glyph_bits(SpiceRasterGlyph *glyph, int bpp, uint8_t *dest, int dest_stride,
                                  SpiceRect *bounds)
{
    SpiceRect glyph_box;
    uint8_t *src;
    int lines;
    int width;

    //todo: support SPICE_STRING_FLAGS_RASTER_TOP_DOWN
    canvas_raster_glyph_box(glyph, &glyph_box);
    ASSERT(glyph_box.top >= bounds->top && glyph_box.bottom <= bounds->bottom);
    ASSERT(glyph_box.left >= bounds->left && glyph_box.right <= bounds->right);
    rect_offset(&glyph_box, -bounds->left, -bounds->top);

    dest += glyph_box.top * dest_stride;
    src = glyph->data;
    lines = glyph_box.bottom - glyph_box.top;
    width = glyph_box.right - glyph_box.left;
    switch (bpp) {
    case 1: {
        int src_stride = ALIGN(width, 8) >> 3;
        int i;

        src += src_stride * (lines);
        for (i = 0; i < lines; i++) {
            src -= src_stride;
            canvas_put_bits(dest, glyph_box.left, src, width);
            dest += dest_stride;
        }
        break;
    }
    case 4: {
        uint8_t *end;
        int src_stride = ALIGN(width * 4, 8) >> 3;

        src += src_stride * lines;
        dest += glyph_box.left;
        end = dest + dest_stride * lines;
        for (; dest != end; dest += dest_stride) {
            int i = 0;
            uint8_t *now;

            src -= src_stride;
            now = src;
            while (i < (width & ~1)) {
                dest[i] = MAX(dest[i], *now & 0xf0);
                dest[i + 1] = MAX(dest[i + 1], *now << 4);
                i += 2;
                now++;
            }
            if (i < width) {
                dest[i] = MAX(dest[i], *now & 0xf0);
                now++;
            }
        }
        break;
    }
    case 8: {
        uint8_t *end;
        src += width * lines;
        dest += glyph_box.left;
        end = dest + dest_stride * lines;
        for (; dest != end; dest += dest_stride, src -= width) {
            int i;

            for (i = 0; i < width; i++) {
                dest[i] = MAX(dest[i], src[i]);
            }
        }
        break;
    }
    default:
        CANVAS_ERROR("invalid bpp");
    }
}

static cairo_surface_t *canvas_get_str_mask(CanvasBase *canvas, SpiceString *str, int bpp, SpicePoint *pos)
{
    SpiceRasterGlyph *glyph = (SpiceRasterGlyph *)str->data;
    SpiceRasterGlyph *next_glyph;
    SpiceRect bounds;
    cairo_surface_t *str_mask;
    uint8_t *dest;
    int dest_stride;
    int i;

    ASSERT(str->length > 0);

    access_test(canvas, glyph, sizeof(SpiceRasterGlyph));
    next_glyph = canvas_next_raster_glyph(glyph, bpp);
    access_test(canvas, glyph, (uint8_t*)next_glyph - (uint8_t*)glyph);
    canvas_raster_glyph_box(glyph, &bounds);

    for (i = 1; i < str->length; i++) {
        SpiceRect glyph_box;

        glyph = next_glyph;
        access_test(canvas, glyph, sizeof(SpiceRasterGlyph));
        next_glyph = canvas_next_raster_glyph(glyph, bpp);
        access_test(canvas, glyph, (uint8_t*)next_glyph - (uint8_t*)glyph);
        canvas_raster_glyph_box(glyph, &glyph_box);
        rect_union(&bounds, &glyph_box);
    }

    str_mask = cairo_image_surface_create((bpp == 1) ? CAIRO_FORMAT_A1 : CAIRO_FORMAT_A8,
                                          bounds.right - bounds.left,
                                          bounds.bottom - bounds.top);
    if (cairo_surface_status(str_mask) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(str_mask)));
    }
    dest = cairo_image_surface_get_data(str_mask);
    dest_stride = cairo_image_surface_get_stride(str_mask);
    glyph = (SpiceRasterGlyph *)str->data;
    for (i = 0; i < str->length; i++) {
#if defined(GL_CANVAS)
        canvas_put_glyph_bits(glyph, bpp, dest + (bounds.bottom - bounds.top - 1) * dest_stride,
                              -dest_stride, &bounds);
#else
        canvas_put_glyph_bits(glyph, bpp, dest, dest_stride, &bounds);
#endif
        glyph = canvas_next_raster_glyph(glyph, bpp);
    }

    pos->x = bounds.left;
    pos->y = bounds.top;
    return str_mask;
}

static inline SpiceVectorGlyph *canvas_next_vector_glyph(const SpiceVectorGlyph *glyph)
{
    return (SpiceVectorGlyph *)((uint8_t *)(glyph + 1) + glyph->data_size);
}

static cairo_surface_t *canvas_scale_surface(cairo_surface_t *src, const SpiceRect *src_area, int width,
                                             int hight, int scale_mode)
{
    cairo_t *cairo;
    cairo_surface_t *surface;
    cairo_pattern_t *pattern;
    cairo_matrix_t matrix;
    double sx, sy;

    surface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, hight);
    if (cairo_surface_status(surface) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s",
                     cairo_status_to_string(cairo_surface_status(surface)));
    }

    cairo = cairo_create(surface);
    if (cairo_status(cairo) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create surface failed, %s", cairo_status_to_string(cairo_status(cairo)));
    }

    pattern = cairo_pattern_create_for_surface(src);
    if (cairo_pattern_status(pattern) != CAIRO_STATUS_SUCCESS) {
        CANVAS_ERROR("create pattern failed, %s",
                     cairo_status_to_string(cairo_pattern_status(pattern)));
    }

    sx = (double)(src_area->right - src_area->left) / width;
    sy = (double)(src_area->bottom - src_area->top) / hight;

    cairo_matrix_init_translate(&matrix, src_area->left, src_area->top);
    cairo_matrix_scale(&matrix, sx, sy);

    cairo_pattern_set_matrix(pattern, &matrix);
    ASSERT(scale_mode == SPICE_IMAGE_SCALE_MODE_INTERPOLATE || scale_mode == SPICE_IMAGE_SCALE_MODE_NEAREST);
    cairo_pattern_set_filter(pattern, (scale_mode == SPICE_IMAGE_SCALE_MODE_NEAREST) ?
                                                          CAIRO_FILTER_NEAREST : CAIRO_FILTER_GOOD);

    cairo_set_source(cairo, pattern);
    cairo_pattern_destroy(pattern);
    cairo_paint(cairo);
    cairo_destroy(cairo);
    return surface;
}

static void quic_usr_error(QuicUsrContext *usr, const char *fmt, ...)
{
    QuicData *usr_data = (QuicData *)usr;
    va_list ap;

    va_start(ap, fmt);
    vsnprintf(usr_data->message_buf, sizeof(usr_data->message_buf), fmt, ap);
    va_end(ap);

    longjmp(usr_data->jmp_env, 1);
}

static void quic_usr_warn(QuicUsrContext *usr, const char *fmt, ...)
{
    QuicData *usr_data = (QuicData *)usr;
    va_list ap;

    va_start(ap, fmt);
    vsnprintf(usr_data->message_buf, sizeof(usr_data->message_buf), fmt, ap);
    va_end(ap);
}

static void *quic_usr_malloc(QuicUsrContext *usr, int size)
{
    return malloc(size);
}

static void quic_usr_free(QuicUsrContext *usr, void *ptr)
{
    free(ptr);
}

#ifdef CAIRO_CANVAS_NO_CHUNKS

static int quic_usr_more_space(QuicUsrContext *usr, uint32_t **io_ptr, int rows_completed)
{
    return 0;
}

static void lz_usr_warn(LzUsrContext *usr, const char *fmt, ...)
{
    LzData *usr_data = (LzData *)usr;
    va_list ap;

    va_start(ap, fmt);
    vsnprintf(usr_data->message_buf, sizeof(usr_data->message_buf), fmt, ap);
    va_end(ap);
}

static void lz_usr_error(LzUsrContext *usr, const char *fmt, ...)
{
    LzData *usr_data = (LzData *)usr;
    va_list ap;

    va_start(ap, fmt);
    vsnprintf(usr_data->message_buf, sizeof(usr_data->message_buf), fmt, ap);
    va_end(ap);

    longjmp(usr_data->jmp_env, 1);
}

static void *lz_usr_malloc(LzUsrContext *usr, int size)
{
    return malloc(size);
}

static void lz_usr_free(LzUsrContext *usr, void *ptr)
{
    free(ptr);
}

static int lz_usr_more_space(LzUsrContext *usr, uint8_t **io_ptr)
{
    return 0;
}

static int lz_usr_more_lines(LzUsrContext *usr, uint8_t **lines)
{
    return 0;
}

#else

static int quic_usr_more_space(QuicUsrContext *usr, uint32_t **io_ptr, int rows_completed)
{
    QuicData *quic_data = (QuicData *)usr;
    DataChunk *chunk;
    uint32_t size;

    if (!quic_data->next) {
        return 0;
    }
    chunk = (DataChunk *)quic_data->get_virt(quic_data->get_virt_opaque, quic_data->next,
                                             sizeof(DataChunk));
    size = chunk->size;
    quic_data->validate_virt(quic_data->validate_virt_opaque, (unsigned long)chunk->data,
                             quic_data->next, size);

    quic_data->next = chunk->next;
    *io_ptr = (uint32_t *)chunk->data;
    return size >> 2;
}

#endif

static int quic_usr_more_lines(QuicUsrContext *usr, uint8_t **lines)
{
    return 0;
}

#ifdef CAIRO_CANVAS_ACCESS_TEST
static void __canvas_set_access_params(CanvasBase *canvas, unsigned long base, unsigned long max)
{
    canvas->base = base;
    canvas->max = max;
}
#endif

static void canvas_base_destroy(CanvasBase *canvas)
{
    quic_destroy(canvas->quic_data.quic);
#ifdef CAIRO_CANVAS_NO_CHUNKS
    lz_destroy(canvas->lz_data.lz);
#endif
#ifdef GDI_CANVAS
    DeleteDC(canvas->dc);
#endif
}

#ifdef CAIRO_CANVAS_CACHE
static int canvas_base_init(CanvasBase *canvas, int depth,
                            void *bits_cache_opaque,
                            bits_cache_put_fn_t bits_cache_put,
                            bits_cache_get_fn_t bits_cache_get,
                            void *palette_cache_opaque,
                            palette_cache_put_fn_t palette_cache_put,
                            palette_cache_get_fn_t palette_cache_get,
                            palette_cache_release_fn_t palette_cache_release
#elif defined(CAIRO_CANVAS_IMAGE_CACHE)
static int canvas_base_init(CanvasBase *canvas, int depth,
                            void *bits_cache_opaque,
                            bits_cache_put_fn_t bits_cache_put,
                            bits_cache_get_fn_t bits_cache_get
#else
static int canvas_base_init(CanvasBase *canvas, int depth
#endif
#ifdef USE_GLZ
                            , void *glz_decoder_opaque, glz_decode_fn_t glz_decode
#endif
#ifndef CAIRO_CANVAS_NO_CHUNKS
                           , void *get_virt_opaque, get_virt_fn_t get_virt,
                           void *validate_virt_opaque, validate_virt_fn_t validate_virt
#endif
                            )
{
    canvas->quic_data.usr.error = quic_usr_error;
    canvas->quic_data.usr.warn = quic_usr_warn;
    canvas->quic_data.usr.info = quic_usr_warn;
    canvas->quic_data.usr.malloc = quic_usr_malloc;
    canvas->quic_data.usr.free = quic_usr_free;
    canvas->quic_data.usr.more_space = quic_usr_more_space;
    canvas->quic_data.usr.more_lines = quic_usr_more_lines;
#ifndef CAIRO_CANVAS_NO_CHUNKS
    canvas->quic_data.get_virt_opaque = get_virt_opaque;
    canvas->quic_data.get_virt = get_virt;
    canvas->quic_data.validate_virt_opaque = validate_virt_opaque;
    canvas->quic_data.validate_virt = validate_virt;
#endif
    if (!(canvas->quic_data.quic = quic_create(&canvas->quic_data.usr))) {
            return 0;
    }
#ifdef CAIRO_CANVAS_NO_CHUNKS
    canvas->lz_data.usr.error = lz_usr_error;
    canvas->lz_data.usr.warn = lz_usr_warn;
    canvas->lz_data.usr.info = lz_usr_warn;
    canvas->lz_data.usr.malloc = lz_usr_malloc;
    canvas->lz_data.usr.free = lz_usr_free;
    canvas->lz_data.usr.more_space = lz_usr_more_space;
    canvas->lz_data.usr.more_lines = lz_usr_more_lines;
    if (!(canvas->lz_data.lz = lz_create(&canvas->lz_data.usr))) {
            return 0;
    }
#endif
#ifdef USE_GLZ
    canvas->glz_data.decoder_opaque = glz_decoder_opaque;
    canvas->glz_data.decode = glz_decode;
#endif

    if (depth == 16) {
        canvas->color_shift = 5;
        canvas->color_mask = 0x1f;
    } else {
        canvas->color_shift = 8;
        canvas->color_mask = 0xff;
    }


#if defined(CAIRO_CANVAS_CACHE) || defined(CAIRO_CANVAS_IMAGE_CACHE)
    canvas->bits_cache_opaque = bits_cache_opaque;
    canvas->bits_cache_put = bits_cache_put;
    canvas->bits_cache_get = bits_cache_get;
#endif
#ifdef CAIRO_CANVAS_CACHE
    canvas->palette_cache_opaque = palette_cache_opaque;
    canvas->palette_cache_put = palette_cache_put;
    canvas->palette_cache_get = palette_cache_get;
    canvas->palette_cache_release = palette_cache_release;
#endif

#ifdef WIN32
    canvas->dc = NULL;
#endif

#ifdef GDI_CANVAS
    canvas->dc = create_compatible_dc();
    if (!canvas->dc) {
        lz_destroy(canvas->lz_data.lz);
        return 0;
    }
#endif
    return 1;
}