// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "math.h"

#include "sky/engine/config.h"
#include "sky/engine/core/painting/Canvas.h"

#include "sky/engine/core/dom/Document.h"
#include "sky/engine/core/dom/Element.h"
#include "sky/engine/core/painting/CanvasImage.h"
#include "sky/engine/core/painting/PaintingTasks.h"
#include "sky/engine/platform/geometry/IntRect.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkBitmap.h"

namespace blink {

Canvas::Canvas(const FloatSize& size)
    : m_size(size)
{
    m_displayList = adoptRef(new DisplayList);
    m_canvas = m_displayList->beginRecording(expandedIntSize(m_size));
}

Canvas::~Canvas()
{
}

void Canvas::save()
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->save();
}

void Canvas::saveLayer(const Rect& bounds, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->saveLayer(!bounds.is_null ? &bounds.sk_rect : nullptr,
                        paint ? &paint->paint() : nullptr);
}

void Canvas::restore()
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->restore();
}

void Canvas::translate(float dx, float dy)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->translate(dx, dy);
}

void Canvas::scale(float sx, float sy)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->scale(sx, sy);
}

void Canvas::rotate(float radians)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->rotate(radians * 180.0/M_PI);
}

void Canvas::skew(float sx, float sy)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->skew(sx, sy);
}

void Canvas::concat(const Float32List& matrix4)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    ASSERT(matrix4.data());

    // TODO(mpcomplete): how can we raise an error in this case?
    if (matrix4.num_elements() != 16)
      return;

    SkMatrix sk_matrix;
    // Mappings from SkMatrix-index to input-index.
    static const int kMappings[] = {
      0, 4, 12,
      1, 5, 13,
      3, 7, 15,
    };
    for (intptr_t i = 0; i < 9; ++i)
      sk_matrix[i] = matrix4.data()[kMappings[i]];

    m_canvas->concat(sk_matrix);
}

void Canvas::clipRect(const Rect& rect)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->clipRect(rect.sk_rect);
}

void Canvas::clipRRect(const RRect* rrect)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->clipRRect(rrect->rrect());
}

void Canvas::clipPath(const CanvasPath* path)
{
    if (!m_canvas)
        return;
    ASSERT(m_displayList->isRecording());
    m_canvas->clipPath(path->path());
}

void Canvas::drawLine(float x0, float y0, float x1, float y1, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawLine(x0, y0, x1, y1, paint->paint());
}

void Canvas::drawPicture(Picture* picture)
{
    if (!m_canvas)
        return;
    ASSERT(picture);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawPicture(picture->toSkia());
}

void Canvas::drawPaint(const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawPaint(paint->paint());
}

void Canvas::drawRect(const Rect& rect, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawRect(rect.sk_rect, paint->paint());
}

void Canvas::drawRRect(const RRect* rrect, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(rrect);
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawRRect(rrect->rrect(), paint->paint());
}

void Canvas::drawOval(const Rect& rect, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawOval(rect.sk_rect, paint->paint());
}

void Canvas::drawCircle(float x, float y, float radius, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawCircle(x, y, radius, paint->paint());
}

void Canvas::drawPath(const CanvasPath* path, const Paint* paint)
{
    if (!m_canvas)
        return;
    ASSERT(path);
    ASSERT(paint);
    ASSERT(m_displayList->isRecording());
    m_canvas->drawPath(path->path(), paint->paint());
}

void Canvas::drawImage(const CanvasImage* image,
                       float x,
                       float y,
                       const Paint* paint) {
  if (!m_canvas)
    return;
  ASSERT(image);
  ASSERT(m_displayList->isRecording());
  m_canvas->drawBitmap(image->bitmap(), x, y, &paint->paint());
}

PassRefPtr<DisplayList> Canvas::finishRecording()
{
    if (!isRecording())
        return nullptr;
    m_canvas = nullptr;
    m_displayList->endRecording();
    return m_displayList.release();
}

} // namespace blink