CpuConsumer: Add set buffer size and format functions.

Add setDefaultBufferSize() and setDefaultBufferFormat(). ImageReader JNI need
them.

Bug: 9254294
Change-Id: I7d2464d43b0ca73fbb834ed22cecbfbb30eef60c

include/gui/CpuConsumer.h

@@ -72,6 +72,18 @@ class CpuConsumer : public ConsumerBase
     // log messages.
     void setName(const String8& name);
 
+    // setDefaultBufferSize is used to set the size of buffers returned by
+    // requestBuffers when a width and height of zero is requested.
+    // A call to setDefaultBufferSize() may trigger requestBuffers() to
+    // be called from the client. Default size is 1x1.
+    status_t setDefaultBufferSize(uint32_t width, uint32_t height);
+
+    // setDefaultBufferFormat allows CpuConsumer's BufferQueue to create buffers
+    // of a defaultFormat if no format is specified by producer. Formats are
+    // enumerated in graphics.h; the initial default is
+    // HAL_PIXEL_FORMAT_RGBA_8888.
+    status_t setDefaultBufferFormat(uint32_t defaultFormat);
+
     // Gets the next graphics buffer from the producer and locks it for CPU use,
     // filling out the passed-in locked buffer structure with the native pointer
     // and metadata. Returns BAD_VALUE if no new buffer is available, and

libs/gui/CpuConsumer.cpp

@@ -55,6 +55,18 @@ void CpuConsumer::setName(const String8& name) {
     mBufferQueue->setConsumerName(name);
 }
 
+status_t CpuConsumer::setDefaultBufferSize(uint32_t width, uint32_t height)
+{
+    Mutex::Autolock _l(mMutex);
+    return mBufferQueue->setDefaultBufferSize(width, height);
+}
+
+status_t CpuConsumer::setDefaultBufferFormat(uint32_t defaultFormat)
+{
+    Mutex::Autolock _l(mMutex);
+    return mBufferQueue->setDefaultBufferFormat(defaultFormat);
+}
+
 status_t CpuConsumer::lockNextBuffer(LockedBuffer *nativeBuffer) {
     status_t err;