Hi friends,
I am using SurfaceView to render a image buffer.
The image buffer is generated by a interval timer, what I need to
do is to show the image data in phone.
Surface can finish this work, the following is my steps to show
the image.
in java layer, create a view, which will driver from SurfaceView,
and get the created surface, set the type as
SURFACE_TYPE_PUSH_BUFFERS, pass the surface to JNI.
then register two buffer to this surface, when the data is
coming, will copy the image data to the framebuffer and do postBuffer.
I am puzzled, sometimes it works fine, sometimes no image show.
static void android_media_Player_setSurface(JNIEnv *env, jobject thiz)
{
jobject surface = env->GetObjectField(thiz, fields.surface);
sp<ISurface> iSurface=NULL;
if (surface != NULL)
{
const sp<Surface>& native_surface = get_surface(env, surface);
iSurface = native_surface->getISurface();
if (iSurface == m_iSurface) {
return;
}
m_iSurface.clear();
m_frameHeap.clear();
}
m_iSurface = iSurface;
if (m_iSurface.get())
{
//RGB-565 frames are 2 bytes/pixel
const sp<Surface>& native_surface = get_surface(env, surface);
int x=0; int y=0; int w=0; int h=0; int freeze=0;
m_iSurface->getSurfaceInformation(x, y, w, h, freeze);
m_heigh = h;
m_width = w;
//double buffer
int frameSize = w * h * 2 * 2;
m_frameHeap = new android::MemoryHeapBase(frameSize);
if (m_frameHeap->heapID() < 0) {
return;
}
android::ISurface::BufferHeap buffers(w, h, w, h,
android::PIXEL_FORMAT_RGB_565, m_frameHeap);
android::status_t ret = m_iSurface->registerBuffers(buffers);
m_frameBufferOffset = 0;
}
}
Here is to postBuffers, called by image generation program, we just
copy the whole region
void postBuffer(unsigned char * idata, int offset, int iLen)
{
if(m_iSurface.get())
{
unsigned char* frameAddr = static_cast<unsigned char*>
(m_frameHeap->base());
if(frameAddr != NULL)
{
if(m_frameBufferOffset == 0)
{
m_frameBufferOffset = m_width * m_heigh*2;
}
else
{
m_frameBufferOffset = 0;
}
memcpy(frameAddr + m_frameBufferOffset, idata-offset,
m_width * m_heigh * 2);
m_iSurface->postBuffer(m_frameBufferOffset);
}
}
}
Thanks
Huadong
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
-~----------~----~----~----~------~----~------~--~---
