1 files changed, 111 insertions, 0 deletions
diff --git a/media/libstagefright/yuv/YUVCanvas.cpp b/media/libstagefright/yuv/YUVCanvas.cpp
new file mode 100644
index 0000000..4c9fee8
--- /dev/null
+++ b/media/libstagefright/yuv/YUVCanvas.cpp
@@ -0,0 +1,111 @@
+/*
+ * 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.
+ */
+
+#define LOG_NDEBUG 0
+#define LOG_TAG "YUVCanvas"
+
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/YUVCanvas.h>
+#include <media/stagefright/YUVImage.h>
+#include <ui/Rect.h>
+
+namespace android {
+
+YUVCanvas::YUVCanvas(YUVImage &yuvImage)
+    : mYUVImage(yuvImage) {
+}
+
+YUVCanvas::~YUVCanvas() {
+}
+
+void YUVCanvas::FillYUV(uint8_t yValue, uint8_t uValue, uint8_t vValue) {
+    for (int32_t y = 0; y < mYUVImage.height(); ++y) {
+        for (int32_t x = 0; x < mYUVImage.width(); ++x) {
+            mYUVImage.setPixelValue(x, y, yValue, uValue, vValue);
+        }
+    }
+}
+
+void YUVCanvas::FillYUVRectangle(const Rect& rect,
+        uint8_t yValue, uint8_t uValue, uint8_t vValue) {
+    for (int32_t y = rect.top; y < rect.bottom; ++y) {
+        for (int32_t x = rect.left; x < rect.right; ++x) {
+            mYUVImage.setPixelValue(x, y, yValue, uValue, vValue);
+        }
+    }
+}
+
+void YUVCanvas::CopyImageRect(
+        const Rect& srcRect,
+        int32_t destStartX, int32_t destStartY,
+        const YUVImage &srcImage) {
+
+    // Try fast copy first
+    if (YUVImage::fastCopyRectangle(
+                srcRect,
+                destStartX, destStartY,
+                srcImage, mYUVImage)) {
+        return;
+    }
+
+    int32_t srcStartX = srcRect.left;
+    int32_t srcStartY = srcRect.top;
+    for (int32_t offsetY = 0; offsetY < srcRect.height(); ++offsetY) {
+        for (int32_t offsetX = 0; offsetX < srcRect.width(); ++offsetX) {
+            int32_t srcX = srcStartX + offsetX;
+            int32_t srcY = srcStartY + offsetY;
+
+            int32_t destX = destStartX + offsetX;
+            int32_t destY = destStartY + offsetY;
+
+            uint8_t yValue;
+            uint8_t uValue;
+            uint8_t vValue;
+
+            srcImage.getPixelValue(srcX, srcY, &yValue, &uValue, &vValue);
+            mYUVImage.setPixelValue(destX, destY, yValue, uValue, vValue);
+        }
+    }
+}
+
+void YUVCanvas::downsample(
+        int32_t srcOffsetX, int32_t srcOffsetY,
+        int32_t skipX, int32_t skipY,
+        const YUVImage &srcImage) {
+    // TODO: Add a low pass filter for downsampling.
+
+    // Check that srcImage is big enough to fill mYUVImage.
+    CHECK((srcOffsetX + (mYUVImage.width() - 1) * skipX) < srcImage.width());
+    CHECK((srcOffsetY + (mYUVImage.height() - 1) * skipY) < srcImage.height());
+
+    uint8_t yValue;
+    uint8_t uValue;
+    uint8_t vValue;
+
+    int32_t srcY = srcOffsetY;
+    for (int32_t y = 0; y < mYUVImage.height(); ++y) {
+        int32_t srcX = srcOffsetX;
+        for (int32_t x = 0; x < mYUVImage.width(); ++x) {
+            srcImage.getPixelValue(srcX, srcY, &yValue, &uValue, &vValue);
+            mYUVImage.setPixelValue(x, y, yValue, uValue, vValue);
+
+            srcX += skipX;
+        }
+        srcY += skipY;
+    }
+}
+
+}  // namespace android