/*

 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.

 * Copyright (C) 2007 Alp Toker <alp@atoker.com>

 *

 * 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 "BitmapImage.h"

#if PLATFORM(CAIRO)

#include "AffineTransform.h"

#include "FloatRect.h"

#include "GraphicsContext.h"

#include <cairo.h>

#include <math.h>

namespace WebCore {

void FrameData::clear()

{

    if (m_frame) {

        cairo_surface_destroy(m_frame);

        m_frame = 0;

        m_duration = 0.;

        m_hasAlpha = true;

    }

}

// ================================================

// Image Class

// ================================================

// Drawing Routines

void BitmapImage::draw(GraphicsContext* context, const FloatRect& dst, const FloatRect& src, CompositeOperator op)

{

    cairo_t* cr = context->platformContext();

    if (!m_source.initialized())

        return;

    cairo_surface_t* image = frameAtIndex(m_currentFrame);

    if (!image) // If it's too early we won't have an image yet.

        return;

    IntSize selfSize = size();

    FloatRect srcRect(src);

    FloatRect dstRect(dst);

    cairo_save(cr);

    // Set the compositing operation.

    if (op == CompositeSourceOver && !frameHasAlphaAtIndex(m_currentFrame))

        context->setCompositeOperation(CompositeCopy);

    else

        context->setCompositeOperation(op);

    // If we're drawing a sub portion of the image or scaling then create

    // a pattern transformation on the image and draw the transformed pattern.

    // Test using example site at http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html

    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(image);

    // To avoid the unwanted gradient effect (#14017) we use

    // CAIRO_FILTER_NEAREST now, but the real fix will be to have

    // CAIRO_EXTEND_PAD implemented for surfaces in Cairo allowing us to still

    // use bilinear filtering

    cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);

    float scaleX = srcRect.width() / dstRect.width();

    float scaleY = srcRect.height() / dstRect.height();

    cairo_matrix_t matrix = { scaleX,  0, 0 , scaleY, srcRect.x(), srcRect.y() };

    cairo_pattern_set_matrix(pattern, &matrix);

    // Draw the image.

    cairo_translate(cr, dstRect.x(), dstRect.y());

    cairo_set_source(cr, pattern);

    cairo_rectangle(cr, 0, 0, dstRect.width(), dstRect.height());

    cairo_fill(cr);

    cairo_pattern_destroy(pattern);

    cairo_restore(cr);

    startAnimation();

}

void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform,

                        const FloatPoint& phase, CompositeOperator op, const FloatRect& destRect)

{

    cairo_surface_t* image = nativeImageForCurrentFrame();

    if (!image) // If it's too early we won't have an image yet.

        return;

    cairo_t* cr = context->platformContext();

    context->save();

    // TODO: Make use of tileRect.

    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(image);

    cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);

    // Workaround to avoid the unwanted gradient effect (#14017)

    cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);

    cairo_matrix_t pattern_matrix = cairo_matrix_t(patternTransform);

    cairo_matrix_t phase_matrix = {1, 0, 0, 1, phase.x(), phase.y()};

    cairo_matrix_t combined;

    cairo_matrix_multiply(&combined, &pattern_matrix, &phase_matrix);

    cairo_matrix_invert(&combined);

    cairo_pattern_set_matrix(pattern, &combined);

    context->setCompositeOperation(op);

    cairo_set_source(cr, pattern);

    cairo_rectangle(cr, destRect.x(), destRect.y(), destRect.width(), destRect.height());

    cairo_fill(cr);

    cairo_pattern_destroy(pattern);

    context->restore();

}

void BitmapImage::checkForSolidColor()

{

    // FIXME: It's easy to implement this optimization. Just need to check the RGBA32 buffer to see if it is 1x1.

    m_isSolidColor = false;

}

}

#endif // PLATFORM(CAIRO)