/* private native int _eglCopyBuffers ( int display , int surface , Graphics target ) ; */
KNIEXPORT KNI_RETURNTYPE_INT
Java_javax_microedition_khronos_egl_EGL10Impl__1eglCopyBuffers() {
EGLDisplay display = (EGLDisplay) KNI_GetParameterAsInt(1);
EGLSurface surface = (EGLSurface) KNI_GetParameterAsInt(2);
jint width = KNI_GetParameterAsInt(4);
jint height = KNI_GetParameterAsInt(5);
jint flip = 0;
JSR239_Pixmap *pixmap = (JSR239_Pixmap *) 0;
EGLBoolean returnValue = EGL_FALSE;
KNI_StartHandles(1);
KNI_DeclareHandle(graphicsHandle);
KNI_GetParameterAsObject(3, graphicsHandle);
returnValue = (jint)eglCopyBuffers((EGLDisplay) display,
(EGLSurface) surface,
(NativePixmapType) pixmap);
#ifdef DEBUG
printf("eglCopyBuffers(0x%x, 0x%x, 0x%x) = %d\n",
display, surface, pixmap, returnValue);
#endif
/* Workaround - use glReadPixels if eglCopyBuffers fails. */
if (returnValue == EGL_FALSE) {
pixmap = JSR239_getImagePixmap(graphicsHandle,
width, height,
4, 8, 8, 8, 8);
if (!pixmap) {
KNI_ThrowNew("java.lang.OutOfMemoryException", "eglCopyBuffers");
goto exit;
}
// Enforce RGBA order of glReadPixels
pixmap->aOffset = 24;
pixmap->bOffset = 16;
pixmap->gOffset = 8;
pixmap->rOffset = 0;
returnValue = eglCopyBuffersWorkaround((EGLDisplay) display,
(EGLSurface) surface,
pixmap);
flip = 1;
}
if (returnValue == EGL_TRUE) {
JSR239_putWindowContents(graphicsHandle, pixmap, flip);
}
if (pixmap) {
JSR239_destroyPixmap(pixmap);
}
exit:
KNI_EndHandles();
KNI_ReturnInt((jint)returnValue);
}
/* private native int _eglCopyBuffers ( int display , int surface , Graphics target ) ; */
KNIEXPORT KNI_RETURNTYPE_INT
Java_javax_microedition_khronos_egl_EGL10Impl__1eglCopyBuffers() {
EGLDisplay display = (EGLDisplay) KNI_GetParameterAsInt(1);
EGLSurface surface = (EGLSurface) KNI_GetParameterAsInt(2);
jint width = KNI_GetParameterAsInt(4);
jint height = KNI_GetParameterAsInt(5);
jint delta_height = KNI_GetParameterAsInt(6);
jint clipX = KNI_GetParameterAsInt(7);
jint clipY = KNI_GetParameterAsInt(8);
jint clipWidth = KNI_GetParameterAsInt(9);
jint clipHeight = KNI_GetParameterAsInt(10);
JSR239_Pixmap* pixmap;
// eglCopyBuffers copies the EGL surface color buffer to a native pixmap.
// As the native pixmaps the Graphics opbject are used. Thus eglCopyBuffers
// can not be used as the destination buffer can be of a different size as
// the source surface. In these case call to eglCopyBuffers may lead to
// the memory corruption.
// Of course it is more efficient ot use eglCopyBuffers instead of workaround
// with glReadPixels, but we should do additional checks to do it safely.
// Let glReadPixels return the data in the following format:
const jint bytesPerPixel = 4;
// for data type for glReadPixels we use GL_UNSIGNED_BYTE, one
// byte for each component
const jint alphaSize = 8;
const jint redSize = 8;
const jint greenSize = 8;
const jint blueSize = 8;
KNI_StartHandles(1);
KNI_DeclareHandle(graphicsHandle);
KNI_GetParameterAsObject(3, graphicsHandle);
pixmap = JSR239_getImagePixmap(graphicsHandle, width, height,
bytesPerPixel,
alphaSize, redSize, greenSize, blueSize);
if (!pixmap) {
KNI_ThrowNew("java.lang.OutOfMemoryException", "eglCopyBuffers");
goto exit;
}
// Enforce RGBA order of glReadPixels
pixmap->aOffset = redSize + greenSize + blueSize;
pixmap->bOffset = greenSize + blueSize;
pixmap->gOffset = blueSize;
pixmap->rOffset = 0;
eglCopyBuffersWorkaround((EGLDisplay)display, (EGLSurface)surface, pixmap);
// glReadPixels returns pixel data from the color buffer, starting with the
// pixel whose lower left corner is at location (x, y), into client memory
// starting at location pixels. Thus we should flip the data returned by
// glReadPixels
JSR239_putWindowContents(graphicsHandle, delta_height,
pixmap,
clipX, clipY, clipWidth, clipHeight,
1 /*should do flip*/);
JSR239_destroyPixmap(pixmap);
exit:
KNI_EndHandles();
KNI_ReturnInt(EGL_TRUE);
}