/*
 * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "CanvasPattern.h"

#include "CachedImage.h"
#include "ExceptionCode.h"
#include "FloatRect.h"
#include "GraphicsContext.h"
#include "Image.h"

// Use Android canvas implementation instead
#undef WTF_PLATFORM_CAIRO

namespace WebCore {

void CanvasPattern::parseRepetitionType(const String& type, bool& repeatX, bool& repeatY, ExceptionCode& ec)
{
    if (type.isEmpty() || type == "repeat") {
        repeatX = true;
        repeatY = true;
        ec = 0;
        return;
    }
    if (type == "no-repeat") {
        repeatX = false;
        repeatY = false;
        ec = 0;
        return;
    }
    if (type == "repeat-x") {
        repeatX = true;
        repeatY = false;
        ec = 0;
        return;
    }
    if (type == "repeat-y") {
        repeatX = false;
        repeatY = true;
        ec = 0;
        return;
    }
    ec = SYNTAX_ERR;
}

#if PLATFORM(CG)

CanvasPattern::CanvasPattern(CGImageRef image, bool repeatX, bool repeatY)
    : m_platformImage(image)
    , m_cachedImage(0)
    , m_repeatX(repeatX)
    , m_repeatY(repeatY)
{
}

#elif PLATFORM(CAIRO)

CanvasPattern::CanvasPattern(cairo_surface_t* surface, bool repeatX, bool repeatY)
    : m_platformImage(cairo_surface_reference(surface))
    , m_cachedImage(0)
    , m_repeatX(repeatX)
    , m_repeatY(repeatY)
{
}

#endif

CanvasPattern::CanvasPattern(CachedImage* cachedImage, bool repeatX, bool repeatY)
    :
#if PLATFORM(CG) || PLATFORM(CAIRO)
      m_platformImage(0)
    ,
#endif
      m_cachedImage(cachedImage)
    , m_repeatX(repeatX)
    , m_repeatY(repeatY)
#ifdef ANDROID_CANVAS_IMPL
    , m_platformPattern(NULL)
#endif
{
    if (cachedImage)
        cachedImage->ref(this);
}

CanvasPattern::~CanvasPattern()
{
#if PLATFORM(CAIRO)
    if (m_platformImage)
        cairo_surface_destroy(m_platformImage);
#endif

#ifdef ANDROID_CANVAS_IMPL
    if (m_platformPattern)
        GraphicsContext::freePlatformPattern(m_platformPattern);
#endif
    if (m_cachedImage)
        m_cachedImage->deref(this);
}

#if PLATFORM(CG)

static void patternCallback(void* info, CGContextRef context)
{
    CGImageRef platformImage = static_cast<CanvasPattern*>(info)->platformImage();
    if (platformImage) {
        CGRect rect = GraphicsContext(context).roundToDevicePixels(
            FloatRect(0, 0, CGImageGetWidth(platformImage), CGImageGetHeight(platformImage)));
        CGContextDrawImage(context, rect, platformImage);
        return;
    }

    CachedImage* cachedImage = static_cast<CanvasPattern*>(info)->cachedImage();
    if (!cachedImage)
        return;
    Image* image = cachedImage->image();
    if (!image)
        return;

    FloatRect rect = GraphicsContext(context).roundToDevicePixels(image->rect());

    if (image->getCGImageRef()) {
        CGContextDrawImage(context, rect, image->getCGImageRef());
        // FIXME: We should refactor this code to use the platform-independent 
        // drawing API in all cases. Then, this didDraw call will happen 
        // automatically, and we can remove it.
        cachedImage->didDraw(image);
        return;
    }

    GraphicsContext(context).drawImage(image, rect);
}

static void patternReleaseCallback(void* info)
{
    static_cast<CanvasPattern*>(info)->deref();
}

CGPatternRef CanvasPattern::createPattern(const CGAffineTransform& transform)
{
    CGRect rect;
    rect.origin.x = 0;
    rect.origin.y = 0;
    if (m_platformImage) {
        rect.size.width = CGImageGetWidth(m_platformImage.get());
        rect.size.height = CGImageGetHeight(m_platformImage.get());
    } else {
        if (!m_cachedImage)
            return 0;
        Image* image = m_cachedImage->image();
        if (!image)
            return 0;
        rect.size.width = image->width();
        rect.size.height = image->height();
    }

    CGAffineTransform patternTransform =
        CGAffineTransformTranslate(CGAffineTransformScale(transform, 1, -1), 0, -rect.size.height);

    float xStep = m_repeatX ? rect.size.width : FLT_MAX;
    // If FLT_MAX should also be used for yStep, nothing is rendered. Using fractions of FLT_MAX also
    // result in nothing being rendered. This is not a problem with xStep.
    // INT_MAX is almost correct, but there seems to be some number wrapping occuring making the fill
    // pattern is not filled correctly. 
    // So, just pick a really large number that works. 
    float yStep = m_repeatY ? rect.size.height : (100000000.0f);

    const CGPatternCallbacks patternCallbacks = { 0, patternCallback, patternReleaseCallback };
    ref();
    return CGPatternCreate(this, rect, patternTransform, xStep, yStep,
        kCGPatternTilingConstantSpacing, TRUE, &patternCallbacks);
}

#elif PLATFORM(CAIRO)

cairo_pattern_t* CanvasPattern::createPattern(const cairo_matrix_t& m)
{
    cairo_surface_t* surface = 0;
    if (m_platformImage) {
        surface = m_platformImage;
    } else {
        if (!m_cachedImage)
            return 0;
        Image* image = m_cachedImage->image();
        if (!image)
            return 0;
        surface = image->nativeImageForCurrentFrame();
    }

    if (!surface)
        return 0;

    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
    cairo_pattern_set_matrix(pattern, &m);
    if (m_repeatX || m_repeatY)
        cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
    return pattern;
}
#endif

#ifdef ANDROID_CANVAS_IMPL
/*  TODO
    1) pass in graphics context or something in case Apple needs to see the current matrix. If so,
       we may need to pass the current (if any) platformPatter to it, so it can free it in and build
       a new one, if that is required (not needed by our platform).
    2) Need a RepeatTile mode for Decal, so we can represent <canvas> notion of "no-repeat"
*/
PlatformPattern* CanvasPattern::platformPattern()
{
    if (NULL == m_platformPattern && m_cachedImage)
    {
        Image* image = m_cachedImage->image();
        if (image)
            m_platformPattern = GraphicsContext::newPlatformPattern(image,
                                                                    m_repeatX ? Image::RepeatTile : Image::StretchTile,
                                                                    m_repeatY ? Image::RepeatTile : Image::StretchTile);
    }
    return m_platformPattern;
}
#endif

}