cc: Nine patch layer.

cc/nine_patch_layer_impl.cc

+// Copyright 2012 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 "config.h"
+
+#include "nine_patch_layer_impl.h"
+
+#include "cc/quad_sink.h"
+#include "cc/texture_draw_quad.h"
+
+namespace cc {
+
+NinePatchLayerImpl::NinePatchLayerImpl(int id)
+    : LayerImpl(id)
+    , m_resourceId(0)
+{
+}
+
+NinePatchLayerImpl::~NinePatchLayerImpl()
+{
+}
+
+ResourceProvider::ResourceId NinePatchLayerImpl::contentsResourceId() const
+{
+    return 0;
+}
+
+void NinePatchLayerImpl::dumpLayerProperties(std::string* str, int indent) const
+{
+    LayerImpl::dumpLayerProperties(str, indent);
+}
+
+
+void NinePatchLayerImpl::willDraw(ResourceProvider* resourceProvider)
+{
+}
+
+static FloatRect normalizedRect(float x, float y, float width, float height, float totalWidth, float totalHeight)
+{
+    return FloatRect(x / totalWidth, y / totalHeight, width / totalWidth, height / totalHeight);
+}
+
+void NinePatchLayerImpl::setNinePatchLayout(const IntSize& imageBounds, const IntRect& aperture)
+{
+    m_imageBounds = imageBounds;
+    m_imageAperture = aperture;
+}
+
+void NinePatchLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuadsData)
+{
+    if (!m_resourceId)
+        return;
+
+    SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
+    appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);
+
+    static const bool flipped = false;
+    static const bool premultipliedAlpha = true;
+
+    DCHECK(!bounds().isEmpty());
+
+    // NinePatch border widths in image space
+    int leftWidth = m_imageAperture.x();
+    int topHeight = m_imageAperture.y();
+    int rightWidth = m_imageBounds.width() - m_imageAperture.maxX();
+    int bottomHeight = m_imageBounds.height() - m_imageAperture.maxY();
+
+    IntRect topLeft(0, 0, leftWidth, topHeight);
+    IntRect topRight(bounds().width() - rightWidth, 0, rightWidth, topHeight);
+    IntRect bottomLeft(0, bounds().height() - bottomHeight, leftWidth, bottomHeight);
+    IntRect bottomRight(topRight.x(), bottomLeft.y(), rightWidth, bottomHeight);
+    IntRect top(topLeft.maxX(), 0, bounds().width() - leftWidth - rightWidth, topHeight);
+    IntRect left(0, topLeft.maxY(), leftWidth, bounds().height() - topHeight - bottomHeight);
+    IntRect right(topRight.x(), topRight.maxY(), rightWidth, left.height());
+    IntRect bottom(top.x(), bottomLeft.y(), top.width(), bottomHeight);
+
+    float imgWidth = m_imageBounds.width();
+    float imgHeight = m_imageBounds.height();
+
+    FloatRect uvTopLeft = normalizedRect(0, 0, leftWidth, topHeight, imgWidth, imgHeight);
+    FloatRect uvTopRight = normalizedRect(imgWidth - rightWidth, 0, rightWidth, topHeight, imgWidth, imgHeight);
+    FloatRect uvBottomLeft = normalizedRect(0, imgHeight - bottomHeight, leftWidth, bottomHeight, imgWidth, imgHeight);
+    FloatRect uvBottomRight = normalizedRect(imgWidth - rightWidth, imgHeight - bottomHeight, rightWidth, bottomHeight, imgWidth, imgHeight);
+    FloatRect uvTop(uvTopLeft.maxX(), 0, (imgWidth - leftWidth - rightWidth) / imgWidth, (topHeight) / imgHeight);
+    FloatRect uvLeft(0, uvTopLeft.maxY(), leftWidth / imgWidth, (imgHeight - topHeight - bottomHeight) / imgHeight);
+    FloatRect uvRight(uvTopRight.x(), uvTopRight.maxY(), rightWidth / imgWidth, uvLeft.height());
+    FloatRect uvBottom(uvTop.x(), uvBottomLeft.y(), uvTop.width(), bottomHeight / imgHeight);
+
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, topLeft, m_resourceId, premultipliedAlpha, uvTopLeft, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, topRight, m_resourceId, premultipliedAlpha, uvTopRight, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, bottomLeft, m_resourceId, premultipliedAlpha, uvBottomLeft, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, bottomRight, m_resourceId, premultipliedAlpha, uvBottomRight, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, top, m_resourceId, premultipliedAlpha, uvTop, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, left, m_resourceId, premultipliedAlpha, uvLeft, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, right, m_resourceId, premultipliedAlpha, uvRight, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    quadSink.append(TextureDrawQuad::create(sharedQuadState, bottom, m_resourceId, premultipliedAlpha, uvBottom, flipped).PassAs<DrawQuad>(), appendQuadsData);
+}
+
+void NinePatchLayerImpl::didDraw(ResourceProvider* resourceProvider)
+{
+}
+
+void NinePatchLayerImpl::didLoseContext()
+{
+    m_resourceId = 0;
+}
+
+const char* NinePatchLayerImpl::layerTypeAsString() const
+{
+    return "NinePatchLayer";
+}
+
+}