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author | Nipun Kwatra <nkwatra@google.com> | 2010-07-27 22:13:04 -0700 |
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committer | Nipun Kwatra <nkwatra@google.com> | 2010-07-29 12:15:57 -0700 |
commit | db205a1d75c1e9a7d0dbd8fa011335249ad6f4ac (patch) | |
tree | f9f88a1c59d5028e9b5fd5fa3a3c8fb959334c30 | |
parent | ac36fde15b7bc14ba27cdb21a0aeb5d7356c47f4 (diff) | |
download | frameworks_av-db205a1d75c1e9a7d0dbd8fa011335249ad6f4ac.zip frameworks_av-db205a1d75c1e9a7d0dbd8fa011335249ad6f4ac.tar.gz frameworks_av-db205a1d75c1e9a7d0dbd8fa011335249ad6f4ac.tar.bz2 |
Adding YUVImage and YUVCanvas.
YUVImage is a container class to hold YUV data and provide
various utilities, e.g. to set/get pixel values for different
YUV formats, fast copying routines, etc.
Currently supported YUV420 Planar and YUV420 Semi Planar.
YUVCanvas holds a reference to a YUVImage on which it can do various
drawing operations.
Change-Id: I052a57b7fbc834efe1626914f76c04c091996cac
-rw-r--r-- | include/media/stagefright/YUVCanvas.h | 67 | ||||
-rw-r--r-- | include/media/stagefright/YUVImage.h | 174 | ||||
-rw-r--r-- | media/libstagefright/yuv/Android.mk | 13 | ||||
-rw-r--r-- | media/libstagefright/yuv/YUVCanvas.cpp | 83 | ||||
-rw-r--r-- | media/libstagefright/yuv/YUVImage.cpp | 404 |
5 files changed, 741 insertions, 0 deletions
diff --git a/include/media/stagefright/YUVCanvas.h b/include/media/stagefright/YUVCanvas.h new file mode 100644 index 0000000..5e17046 --- /dev/null +++ b/include/media/stagefright/YUVCanvas.h @@ -0,0 +1,67 @@ +/* + * 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. + */ + +// YUVCanvas holds a reference to a YUVImage on which it can do various +// drawing operations. It provides various utility functions for filling, +// cropping, etc. + + +#ifndef YUV_CANVAS_H_ + +#define YUV_CANVAS_H_ + +#include <stdint.h> + +namespace android { + +class YUVImage; +class Rect; + +class YUVCanvas { +public: + + // Constructor takes in reference to a yuvImage on which it can do + // various drawing opreations. + YUVCanvas(YUVImage &yuvImage); + ~YUVCanvas(); + + // Fills the entire image with the given YUV values. + void FillYUV(uint8_t yValue, uint8_t uValue, uint8_t vValue); + + // Fills the rectangular region [startX,endX]x[startY,endY] with the given YUV values. + void FillYUVRectangle(const Rect& rect, + uint8_t yValue, uint8_t uValue, uint8_t vValue); + + // Copies the region [startX,endX]x[startY,endY] from srcImage into the + // canvas' target image (mYUVImage) starting at + // (destinationStartX,destinationStartY). + // Note that undefined behavior may occur if srcImage is same as the canvas' + // target image. + void CopyImageRect( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage); + +private: + YUVImage& mYUVImage; + + YUVCanvas(const YUVCanvas &); + YUVCanvas &operator=(const YUVCanvas &); +}; + +} // namespace android + +#endif // YUV_CANVAS_H_ diff --git a/include/media/stagefright/YUVImage.h b/include/media/stagefright/YUVImage.h new file mode 100644 index 0000000..afeac3f --- /dev/null +++ b/include/media/stagefright/YUVImage.h @@ -0,0 +1,174 @@ +/* + * 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. + */ + +// A container class to hold YUV data and provide various utilities, +// e.g. to set/get pixel values. +// Supported formats: +// - YUV420 Planar +// - YUV420 Semi Planar +// +// Currently does not support variable strides. +// +// Implementation: Two simple abstractions are done to simplify access +// to YUV channels for different formats: +// - initializeYUVPointers() sets up pointers (mYdata, mUdata, mVdata) to +// point to the right start locations of the different channel data depending +// on the format. +// - getOffsets() returns the correct offset for the different channels +// depending on the format. +// Location of any pixel's YUV channels can then be easily computed using these. +// + +#ifndef YUV_IMAGE_H_ + +#define YUV_IMAGE_H_ + +#include <stdint.h> +#include <cstring> + +namespace android { + +class Rect; + +class YUVImage { +public: + // Supported YUV formats + enum YUVFormat { + YUV420Planar, + YUV420SemiPlanar + }; + + // Constructs an image with the given size, format. Also allocates and owns + // the required memory. + YUVImage(YUVFormat yuvFormat, int32_t width, int32_t height); + + // Constructs an image with the given size, format. The memory is provided + // by the caller and we don't own it. + YUVImage(YUVFormat yuvFormat, int32_t width, int32_t height, uint8_t *buffer); + + // Destructor to delete the memory if it owns it. + ~YUVImage(); + + // Returns the size of the buffer required to store the YUV data for the given + // format and geometry. Useful when the caller wants to allocate the requisite + // memory. + static size_t bufferSize(YUVFormat yuvFormat, int32_t width, int32_t height); + + int32_t width() {return mWidth;} + int32_t height() {return mHeight;} + + // Get the pixel YUV value at pixel (x,y). + // Note that the range of x is [0, width-1] and the range of y is [0, height-1]. + // Returns true if get was succesful and false otherwise. + bool getPixelValue(int32_t x, int32_t y, + uint8_t *yPtr, uint8_t *uPtr, uint8_t *vPtr) const; + + // Set the pixel YUV value at pixel (x,y). + // Note that the range of x is [0, width-1] and the range of y is [0, height-1]. + // Returns true if set was succesful and false otherwise. + bool setPixelValue(int32_t x, int32_t y, + uint8_t yValue, uint8_t uValue, uint8_t vValue); + + // Uses memcpy to copy an entire row of data + static void fastCopyRectangle420Planar( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage); + + // Uses memcpy to copy an entire row of data + static void fastCopyRectangle420SemiPlanar( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage); + + // Tries to use memcopy to copy entire rows of data. + // Returns false if fast copy is not possible for the passed image formats. + static bool fastCopyRectangle( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage); + + // Convert the given YUV value to RGB. + void yuv2rgb(uint8_t yValue, uint8_t uValue, uint8_t vValue, + uint8_t *r, uint8_t *g, uint8_t *b) const; + + // Write the image to a human readable PPM file. + // Returns true if write was succesful and false otherwise. + bool writeToPPM(const char *filename) const; + +private: + // YUV Format of the image. + YUVFormat mYUVFormat; + + int32_t mWidth; + int32_t mHeight; + + // Pointer to the memory buffer. + uint8_t *mBuffer; + + // Boolean telling whether we own the memory buffer. + bool mOwnBuffer; + + // Pointer to start of the Y data plane. + uint8_t *mYdata; + + // Pointer to start of the U data plane. Note that in case of interleaved formats like + // YUV420 semiplanar, mUdata points to the start of the U data in the UV plane. + uint8_t *mUdata; + + // Pointer to start of the V data plane. Note that in case of interleaved formats like + // YUV420 semiplanar, mVdata points to the start of the V data in the UV plane. + uint8_t *mVdata; + + // Initialize the pointers mYdata, mUdata, mVdata to point to the right locations for + // the given format and geometry. + // Returns true if initialize was succesful and false otherwise. + bool initializeYUVPointers(); + + // For the given pixel location, this returns the offset of the location of y, u and v + // data from the corresponding base pointers -- mYdata, mUdata, mVdata. + // Note that the range of x is [0, width-1] and the range of y is [0, height-1]. + // Returns true if getting offsets was succesful and false otherwise. + bool getOffsets(int32_t x, int32_t y, + int32_t *yOffset, int32_t *uOffset, int32_t *vOffset) const; + + // Returns the offset increments incurred in going from one data row to the next data row + // for the YUV channels. Note that this corresponds to data rows and not pixel rows. + // E.g. depending on formats, U/V channels may have only one data row corresponding + // to two pixel rows. + bool getOffsetIncrementsPerDataRow( + int32_t *yDataOffsetIncrement, + int32_t *uDataOffsetIncrement, + int32_t *vDataOffsetIncrement) const; + + // Given the offset return the address of the corresponding channel's data. + uint8_t* getYAddress(int32_t offset) const; + uint8_t* getUAddress(int32_t offset) const; + uint8_t* getVAddress(int32_t offset) const; + + // Given the pixel location, returns the address of the corresponding channel's data. + // Note that the range of x is [0, width-1] and the range of y is [0, height-1]. + bool getYUVAddresses(int32_t x, int32_t y, + uint8_t **yAddr, uint8_t **uAddr, uint8_t **vAddr) const; + + // Disallow implicit casting and copying. + YUVImage(const YUVImage &); + YUVImage &operator=(const YUVImage &); +}; + +} // namespace android + +#endif // YUV_IMAGE_H_ diff --git a/media/libstagefright/yuv/Android.mk b/media/libstagefright/yuv/Android.mk new file mode 100644 index 0000000..0794ad1 --- /dev/null +++ b/media/libstagefright/yuv/Android.mk @@ -0,0 +1,13 @@ +LOCAL_PATH:= $(call my-dir) +include $(CLEAR_VARS) + +LOCAL_SRC_FILES:= \ + YUVImage.cpp \ + YUVCanvas.cpp + +LOCAL_SHARED_LIBRARIES := \ + libcutils + +LOCAL_MODULE:= libstagefright_yuv + +include $(BUILD_SHARED_LIBRARY) diff --git a/media/libstagefright/yuv/YUVCanvas.cpp b/media/libstagefright/yuv/YUVCanvas.cpp new file mode 100644 index 0000000..7ef652d --- /dev/null +++ b/media/libstagefright/yuv/YUVCanvas.cpp @@ -0,0 +1,83 @@ +/* + * 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/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); + } + } +} + +} // namespace android diff --git a/media/libstagefright/yuv/YUVImage.cpp b/media/libstagefright/yuv/YUVImage.cpp new file mode 100644 index 0000000..73e3297 --- /dev/null +++ b/media/libstagefright/yuv/YUVImage.cpp @@ -0,0 +1,404 @@ +/* + * 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 "YUVImage" + +#include <media/stagefright/YUVImage.h> +#include <ui/Rect.h> +#include <media/stagefright/MediaDebug.h> + +namespace android { + +YUVImage::YUVImage(YUVFormat yuvFormat, int32_t width, int32_t height) { + mYUVFormat = yuvFormat; + mWidth = width; + mHeight = height; + + size_t numberOfBytes = bufferSize(yuvFormat, width, height); + uint8_t *buffer = new uint8_t[numberOfBytes]; + mBuffer = buffer; + mOwnBuffer = true; + + initializeYUVPointers(); +} + +YUVImage::YUVImage(YUVFormat yuvFormat, int32_t width, int32_t height, uint8_t *buffer) { + mYUVFormat = yuvFormat; + mWidth = width; + mHeight = height; + mBuffer = buffer; + mOwnBuffer = false; + + initializeYUVPointers(); +} + +//static +size_t YUVImage::bufferSize(YUVFormat yuvFormat, int32_t width, int32_t height) { + int32_t numberOfPixels = width*height; + size_t numberOfBytes = 0; + if (yuvFormat == YUV420Planar || yuvFormat == YUV420SemiPlanar) { + // Y takes numberOfPixels bytes and U/V take numberOfPixels/4 bytes each. + numberOfBytes = (size_t)(numberOfPixels + (numberOfPixels >> 1)); + } else { + LOGE("Format not supported"); + } + return numberOfBytes; +} + +bool YUVImage::initializeYUVPointers() { + int32_t numberOfPixels = mWidth * mHeight; + + if (mYUVFormat == YUV420Planar) { + mYdata = (uint8_t *)mBuffer; + mUdata = mYdata + numberOfPixels; + mVdata = mUdata + (numberOfPixels >> 2); + } else if (mYUVFormat == YUV420SemiPlanar) { + // U and V channels are interleaved as VUVUVU. + // So V data starts at the end of Y channel and + // U data starts right after V's start. + mYdata = (uint8_t *)mBuffer; + mVdata = mYdata + numberOfPixels; + mUdata = mVdata + 1; + } else { + LOGE("Format not supported"); + return false; + } + return true; +} + +YUVImage::~YUVImage() { + if (mOwnBuffer) delete[] mBuffer; +} + +bool YUVImage::getOffsets(int32_t x, int32_t y, + int32_t *yOffset, int32_t *uOffset, int32_t *vOffset) const { + *yOffset = y*mWidth + x; + + int32_t uvOffset = (y >> 1) * (mWidth >> 1) + (x >> 1); + if (mYUVFormat == YUV420Planar) { + *uOffset = uvOffset; + *vOffset = uvOffset; + } else if (mYUVFormat == YUV420SemiPlanar) { + // Since U and V channels are interleaved, offsets need + // to be doubled. + *uOffset = 2*uvOffset; + *vOffset = 2*uvOffset; + } else { + LOGE("Format not supported"); + return false; + } + + return true; +} + +bool YUVImage::getOffsetIncrementsPerDataRow( + int32_t *yDataOffsetIncrement, + int32_t *uDataOffsetIncrement, + int32_t *vDataOffsetIncrement) const { + *yDataOffsetIncrement = mWidth; + + int32_t uvDataOffsetIncrement = mWidth >> 1; + + if (mYUVFormat == YUV420Planar) { + *uDataOffsetIncrement = uvDataOffsetIncrement; + *vDataOffsetIncrement = uvDataOffsetIncrement; + } else if (mYUVFormat == YUV420SemiPlanar) { + // Since U and V channels are interleaved, offsets need + // to be doubled. + *uDataOffsetIncrement = 2*uvDataOffsetIncrement; + *vDataOffsetIncrement = 2*uvDataOffsetIncrement; + } else { + LOGE("Format not supported"); + return false; + } + + return true; +} + +uint8_t* YUVImage::getYAddress(int32_t offset) const { + return mYdata + offset; +} + +uint8_t* YUVImage::getUAddress(int32_t offset) const { + return mUdata + offset; +} + +uint8_t* YUVImage::getVAddress(int32_t offset) const { + return mVdata + offset; +} + +bool YUVImage::getYUVAddresses(int32_t x, int32_t y, + uint8_t **yAddr, uint8_t **uAddr, uint8_t **vAddr) const { + int32_t yOffset; + int32_t uOffset; + int32_t vOffset; + if (!getOffsets(x, y, &yOffset, &uOffset, &vOffset)) return false; + + *yAddr = getYAddress(yOffset); + *uAddr = getUAddress(uOffset); + *vAddr = getVAddress(vOffset); + + return true; +} + +bool YUVImage::getPixelValue(int32_t x, int32_t y, + uint8_t *yPtr, uint8_t *uPtr, uint8_t *vPtr) const { + uint8_t *yAddr; + uint8_t *uAddr; + uint8_t *vAddr; + if (!getYUVAddresses(x, y, &yAddr, &uAddr, &vAddr)) return false; + + *yPtr = *yAddr; + *uPtr = *uAddr; + *vPtr = *vAddr; + + return true; +} + +bool YUVImage::setPixelValue(int32_t x, int32_t y, + uint8_t yValue, uint8_t uValue, uint8_t vValue) { + uint8_t *yAddr; + uint8_t *uAddr; + uint8_t *vAddr; + if (!getYUVAddresses(x, y, &yAddr, &uAddr, &vAddr)) return false; + + *yAddr = yValue; + *uAddr = uValue; + *vAddr = vValue; + + return true; +} + +void YUVImage::fastCopyRectangle420Planar( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage) { + CHECK(srcImage.mYUVFormat == YUV420Planar); + CHECK(destImage.mYUVFormat == YUV420Planar); + + int32_t srcStartX = srcRect.left; + int32_t srcStartY = srcRect.top; + int32_t width = srcRect.width(); + int32_t height = srcRect.height(); + + // Get source and destination start addresses + uint8_t *ySrcAddrBase; + uint8_t *uSrcAddrBase; + uint8_t *vSrcAddrBase; + srcImage.getYUVAddresses(srcStartX, srcStartY, + &ySrcAddrBase, &uSrcAddrBase, &vSrcAddrBase); + + uint8_t *yDestAddrBase; + uint8_t *uDestAddrBase; + uint8_t *vDestAddrBase; + destImage.getYUVAddresses(destStartX, destStartY, + &yDestAddrBase, &uDestAddrBase, &vDestAddrBase); + + // Get source and destination offset increments incurred in going + // from one data row to next. + int32_t ySrcOffsetIncrement; + int32_t uSrcOffsetIncrement; + int32_t vSrcOffsetIncrement; + srcImage.getOffsetIncrementsPerDataRow( + &ySrcOffsetIncrement, &uSrcOffsetIncrement, &vSrcOffsetIncrement); + + int32_t yDestOffsetIncrement; + int32_t uDestOffsetIncrement; + int32_t vDestOffsetIncrement; + destImage.getOffsetIncrementsPerDataRow( + &yDestOffsetIncrement, &uDestOffsetIncrement, &vDestOffsetIncrement); + + // Copy Y + { + size_t numberOfYBytesPerRow = (size_t) width; + uint8_t *ySrcAddr = ySrcAddrBase; + uint8_t *yDestAddr = yDestAddrBase; + for (int32_t offsetY = 0; offsetY < height; ++offsetY) { + memcpy(yDestAddr, ySrcAddr, numberOfYBytesPerRow); + + ySrcAddr += ySrcOffsetIncrement; + yDestAddr += yDestOffsetIncrement; + } + } + + // Copy U + { + size_t numberOfUBytesPerRow = (size_t) (width >> 1); + uint8_t *uSrcAddr = uSrcAddrBase; + uint8_t *uDestAddr = uDestAddrBase; + // Every other row has an entry for U/V channel values. Hence only + // go half the height. + for (int32_t offsetY = 0; offsetY < (height >> 1); ++offsetY) { + memcpy(uDestAddr, uSrcAddr, numberOfUBytesPerRow); + + uSrcAddr += uSrcOffsetIncrement; + uDestAddr += uDestOffsetIncrement; + } + } + + // Copy V + { + size_t numberOfVBytesPerRow = (size_t) (width >> 1); + uint8_t *vSrcAddr = vSrcAddrBase; + uint8_t *vDestAddr = vDestAddrBase; + // Every other pixel row has a U/V data row. Hence only go half the height. + for (int32_t offsetY = 0; offsetY < (height >> 1); ++offsetY) { + memcpy(vDestAddr, vSrcAddr, numberOfVBytesPerRow); + + vSrcAddr += vSrcOffsetIncrement; + vDestAddr += vDestOffsetIncrement; + } + } +} + +void YUVImage::fastCopyRectangle420SemiPlanar( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage) { + CHECK(srcImage.mYUVFormat == YUV420SemiPlanar); + CHECK(destImage.mYUVFormat == YUV420SemiPlanar); + + int32_t srcStartX = srcRect.left; + int32_t srcStartY = srcRect.top; + int32_t width = srcRect.width(); + int32_t height = srcRect.height(); + + // Get source and destination start addresses + uint8_t *ySrcAddrBase; + uint8_t *uSrcAddrBase; + uint8_t *vSrcAddrBase; + srcImage.getYUVAddresses(srcStartX, srcStartY, + &ySrcAddrBase, &uSrcAddrBase, &vSrcAddrBase); + + uint8_t *yDestAddrBase; + uint8_t *uDestAddrBase; + uint8_t *vDestAddrBase; + destImage.getYUVAddresses(destStartX, destStartY, + &yDestAddrBase, &uDestAddrBase, &vDestAddrBase); + + // Get source and destination offset increments incurred in going + // from one data row to next. + int32_t ySrcOffsetIncrement; + int32_t uSrcOffsetIncrement; + int32_t vSrcOffsetIncrement; + srcImage.getOffsetIncrementsPerDataRow( + &ySrcOffsetIncrement, &uSrcOffsetIncrement, &vSrcOffsetIncrement); + + int32_t yDestOffsetIncrement; + int32_t uDestOffsetIncrement; + int32_t vDestOffsetIncrement; + destImage.getOffsetIncrementsPerDataRow( + &yDestOffsetIncrement, &uDestOffsetIncrement, &vDestOffsetIncrement); + + // Copy Y + { + size_t numberOfYBytesPerRow = (size_t) width; + uint8_t *ySrcAddr = ySrcAddrBase; + uint8_t *yDestAddr = yDestAddrBase; + for (int32_t offsetY = 0; offsetY < height; ++offsetY) { + memcpy(yDestAddr, ySrcAddr, numberOfYBytesPerRow); + + ySrcAddr = ySrcAddr + ySrcOffsetIncrement; + yDestAddr = yDestAddr + yDestOffsetIncrement; + } + } + + // Copy UV + { + // UV are interleaved. So number of UV bytes per row is 2*(width/2). + size_t numberOfUVBytesPerRow = (size_t) width; + uint8_t *vSrcAddr = vSrcAddrBase; + uint8_t *vDestAddr = vDestAddrBase; + // Every other pixel row has a U/V data row. Hence only go half the height. + for (int32_t offsetY = 0; offsetY < (height >> 1); ++offsetY) { + memcpy(vDestAddr, vSrcAddr, numberOfUVBytesPerRow); + + vSrcAddr += vSrcOffsetIncrement; + vDestAddr += vDestOffsetIncrement; + } + } +} + +// static +bool YUVImage::fastCopyRectangle( + const Rect& srcRect, + int32_t destStartX, int32_t destStartY, + const YUVImage &srcImage, YUVImage &destImage) { + if (srcImage.mYUVFormat == destImage.mYUVFormat) { + if (srcImage.mYUVFormat == YUV420Planar) { + fastCopyRectangle420Planar( + srcRect, + destStartX, destStartY, + srcImage, destImage); + } else if (srcImage.mYUVFormat == YUV420SemiPlanar) { + fastCopyRectangle420SemiPlanar( + srcRect, + destStartX, destStartY, + srcImage, destImage); + } + return true; + } + return false; +} + +uint8_t clamp(uint8_t v, uint8_t minValue, uint8_t maxValue) { + CHECK(maxValue >= minValue); + + if (v < minValue) return minValue; + else if (v > maxValue) return maxValue; + else return v; +} + +void YUVImage::yuv2rgb(uint8_t yValue, uint8_t uValue, uint8_t vValue, + uint8_t *r, uint8_t *g, uint8_t *b) const { + *r = yValue + (1.370705 * (vValue-128)); + *g = yValue - (0.698001 * (vValue-128)) - (0.337633 * (uValue-128)); + *b = yValue + (1.732446 * (uValue-128)); + + *r = clamp(*r, 0, 255); + *g = clamp(*g, 0, 255); + *b = clamp(*b, 0, 255); +} + +bool YUVImage::writeToPPM(const char *filename) const { + FILE *fp = fopen(filename, "w"); + if (fp == NULL) { + return false; + } + fprintf(fp, "P3\n"); + fprintf(fp, "%d %d\n", mWidth, mHeight); + fprintf(fp, "255\n"); + for (int32_t y = 0; y < mHeight; ++y) { + for (int32_t x = 0; x < mWidth; ++x) { + uint8_t yValue; + uint8_t uValue; + uint8_t vValue; + getPixelValue(x, y, &yValue, &uValue, & vValue); + + uint8_t rValue; + uint8_t gValue; + uint8_t bValue; + yuv2rgb(yValue, uValue, vValue, &rValue, &gValue, &bValue); + + fprintf(fp, "%d %d %d\n", (int32_t)rValue, (int32_t)gValue, (int32_t)bValue); + } + } + fclose(fp); + return true; +} + +} // namespace android |