libs/hwui/Patch.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ANDROID_UI_PATCH_H
#define ANDROID_UI_PATCH_H

#include <sys/types.h>
#include <cstring>

#include "Vertex.h"

namespace android {
namespace uirenderer {

/**
 * Description of a patch.
 */
struct PatchDescription {
    PatchDescription(): bitmapWidth(0), bitmapHeight(0),
            pixelWidth(0), pixelHeight(0), xCount(0), yCount(0) { }
    PatchDescription(const float bitmapWidth, const float bitmapHeight,
            const float pixelWidth, const float pixelHeight,
            const uint32_t xCount, const uint32_t yCount):
            bitmapWidth(bitmapWidth), bitmapHeight(bitmapHeight),
            pixelWidth(pixelWidth), pixelHeight(pixelHeight),
            xCount(xCount), yCount(yCount) { }
    PatchDescription(const PatchDescription& description):
            bitmapWidth(description.bitmapWidth), bitmapHeight(description.bitmapHeight),
            pixelWidth(description.pixelWidth), pixelHeight(description.pixelHeight),
            xCount(description.xCount), yCount(description.yCount) { }

    float bitmapWidth;
    float bitmapHeight;
    float pixelWidth;
    float pixelHeight;
    uint32_t xCount;
    uint32_t yCount;

    bool operator<(const PatchDescription& rhs) const {
        return memcmp(this, &rhs, sizeof(PatchDescription)) < 0;
    }
}; // struct PatchDescription

/**
 * An OpenGL patch. This contains an array of vertices and an array of
 * indices to render the vertices.
 */
struct Patch {
    Patch(const uint32_t xCount, const uint32_t yCount);
    ~Patch();

    void updateVertices(const float bitmapWidth, const float bitmapHeight,
            float left, float top, float right, float bottom,
            const int32_t* xDivs, const int32_t* yDivs,
            const uint32_t width, const uint32_t height);

    TextureVertex* vertices;
    uint32_t verticesCount;

private:
    static inline void generateRow(TextureVertex*& vertex, float y1, float y2,
            float v1, float v2, const int32_t xDivs[], uint32_t xCount,
            float stretchX, float width, float bitmapWidth);
    static inline void generateQuad(TextureVertex*& vertex,
            float x1, float y1, float x2, float y2,
            float u1, float v1, float u2, float v2);
}; // struct Patch

}; // namespace uirenderer
}; // namespace android

#endif // ANDROID_UI_PATCH_H