1 files changed, 163 insertions, 0 deletions
diff --git a/libs/hwui/PixelBuffer.cpp b/libs/hwui/PixelBuffer.cpp
new file mode 100644
index 0000000..8280370
--- /dev/null
+++ b/libs/hwui/PixelBuffer.cpp
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#define LOG_TAG "OpenGLRenderer"
+
+#include <utils/Log.h>
+
+#include "Caches.h"
+#include "Extensions.h"
+#include "PixelBuffer.h"
+#include "Properties.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// CPU pixel buffer
+///////////////////////////////////////////////////////////////////////////////
+
+class CpuPixelBuffer: public PixelBuffer {
+public:
+    CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
+    ~CpuPixelBuffer();
+
+    uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
+    void unmap();
+
+    uint8_t* getMappedPointer() const;
+
+    void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
+
+private:
+    uint8_t* mBuffer;
+};
+
+CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
+        PixelBuffer(format, width, height) {
+    mBuffer = new uint8_t[width * height * formatSize(format)];
+}
+
+CpuPixelBuffer::~CpuPixelBuffer() {
+    delete[] mBuffer;
+}
+
+uint8_t* CpuPixelBuffer::map(AccessMode mode) {
+    if (mAccessMode == kAccessMode_None) {
+        mAccessMode = mode;
+    }
+    return mBuffer;
+}
+
+void CpuPixelBuffer::unmap() {
+    mAccessMode = kAccessMode_None;
+}
+
+uint8_t* CpuPixelBuffer::getMappedPointer() const {
+    return mAccessMode == kAccessMode_None ? NULL : mBuffer;
+}
+
+void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
+    glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
+            mFormat, GL_UNSIGNED_BYTE, mBuffer + offset);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// GPU pixel buffer
+///////////////////////////////////////////////////////////////////////////////
+
+class GpuPixelBuffer: public PixelBuffer {
+public:
+    GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
+    ~GpuPixelBuffer();
+
+    uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
+    void unmap();
+
+    uint8_t* getMappedPointer() const;
+
+    void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
+
+private:
+    GLuint mBuffer;
+    uint8_t* mMappedPointer;
+    Caches& mCaches;
+};
+
+GpuPixelBuffer::GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
+        PixelBuffer(format, width, height), mMappedPointer(0), mCaches(Caches::getInstance()) {
+    glGenBuffers(1, &mBuffer);
+    mCaches.bindPixelBuffer(mBuffer);
+    glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), NULL, GL_DYNAMIC_DRAW);
+    mCaches.unbindPixelBuffer();
+}
+
+GpuPixelBuffer::~GpuPixelBuffer() {
+    glDeleteBuffers(1, &mBuffer);
+}
+
+uint8_t* GpuPixelBuffer::map(AccessMode mode) {
+    if (mAccessMode == kAccessMode_None) {
+        mCaches.bindPixelBuffer(mBuffer);
+        mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
+        mAccessMode = mode;
+    }
+
+    return mMappedPointer;
+}
+
+void GpuPixelBuffer::unmap() {
+    if (mAccessMode != kAccessMode_None) {
+        if (mMappedPointer) {
+            mCaches.bindPixelBuffer(mBuffer);
+            glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
+        }
+        mAccessMode = kAccessMode_None;
+        mMappedPointer = NULL;
+    }
+}
+
+uint8_t* GpuPixelBuffer::getMappedPointer() const {
+    return mMappedPointer;
+}
+
+void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
+    // If the buffer is not mapped, unmap() will not bind it
+    mCaches.bindPixelBuffer(mBuffer);
+    unmap();
+    glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
+            GL_UNSIGNED_BYTE, (void*) offset);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Factory
+///////////////////////////////////////////////////////////////////////////////
+
+PixelBuffer* PixelBuffer::create(GLenum format, uint32_t width, uint32_t height, BufferType type) {
+    bool gpuBuffer = type == kBufferType_Auto && Extensions::getInstance().getMajorGlVersion() >= 3;
+    if (gpuBuffer) {
+        char property[PROPERTY_VALUE_MAX];
+        if (property_get(PROPERTY_ENABLE_GPU_PIXEL_BUFFERS, property, "false") > 0) {
+            if (!strcmp(property, "true")) {
+                return new GpuPixelBuffer(format, width, height);
+            }
+        }
+    }
+    return new CpuPixelBuffer(format, width, height);
+}
+
+}; // namespace uirenderer
+}; // namespace android