minhkhanh / graphicbuffer

use GraphicBuffer of Android native code in your project

GraphicBuffer

Use GraphicBuffer class in Android native code in your project, without compiling with Android source code.

Inspired by tcuAndroidInternals.cpp

How to use

The usage is exactly the same with android::GraphicBuffer

#include "GraphicBuffer.h"

Intialize

int usage = GraphicBuffer::USAGE_HW_TEXTURE | GraphicBuffer::USAGE_SW_READ_OFTEN | GraphicBuffer::USAGE_SW_WRITE_RARELY;
auto graphicBuf = std::make_unique<GraphicBuffer>(width, height, PIXEL_FORMAT_RGBA_8888, usage);

Get ANativeWindowBuffer (or EGLClientBuffer)

auto clientBuf = (EGLClientBuffer) graphicBuf->getNativeBuffer();

Get content image:

void *readPtr, *writePtr;
graphicBuf->lock(GraphicBuffer::USAGE_SW_READ_OFTEN, &readPtr);
writePtr = image.data;
int stride = graphicBuf->getStride();
for (int row = 0; row < height; row++) {
    memcpy(writePtr, readPtr, width * 4);
    readPtr = (void *)(int(readPtr) + stride * 4);
    writePtr = (void *)(int(writePtr) + width * 4);
}
graphicBuf->unlock();