static DFBResult
Construct( IDirectFBImageProvider *thiz,
IDirectFBDataBuffer *buffer )
{
DFBResult ret = DFB_FAILURE;
DFB_ALLOCATE_INTERFACE_DATA(thiz, IDirectFBImageProvider_PNG)
data->ref = 1;
data->buffer = buffer;
/* Increase the data buffer reference counter. */
buffer->AddRef( buffer );
/* Create the PNG read handle. */
data->png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL );
if (!data->png_ptr)
goto error;
/* Create the PNG info handle. */
data->info_ptr = png_create_info_struct( data->png_ptr );
if (!data->info_ptr)
goto error;
/* Setup progressive image loading. */
png_set_progressive_read_fn( data->png_ptr, data,
png_info_callback,
png_row_callback,
png_end_callback );
/* Read until info callback is called. */
ret = push_data_until_stage( data, STAGE_INFO, 4 );
if (ret)
goto error;
thiz->AddRef = IDirectFBImageProvider_PNG_AddRef;
thiz->Release = IDirectFBImageProvider_PNG_Release;
thiz->RenderTo = IDirectFBImageProvider_PNG_RenderTo;
thiz->SetRenderCallback = IDirectFBImageProvider_PNG_SetRenderCallback;
thiz->GetImageDescription = IDirectFBImageProvider_PNG_GetImageDescription;
thiz->GetSurfaceDescription =
IDirectFBImageProvider_PNG_GetSurfaceDescription;
return DFB_OK;
error:
if (data->png_ptr)
png_destroy_read_struct( &data->png_ptr, &data->info_ptr, NULL );
buffer->Release( buffer );
if (data->image)
DFBFREE( data->image );
DFB_DEALLOCATE_INTERFACE(thiz);
return ret;
}
static DFBResult
Construct( IDirectFBImageProvider *thiz,
... )
{
DFBResult ret = DFB_FAILURE;
IDirectFBDataBuffer *buffer;
CoreDFB *core;
va_list tag;
DIRECT_ALLOCATE_INTERFACE_DATA(thiz, IDirectFBImageProvider_PNG)
va_start( tag, thiz );
buffer = va_arg( tag, IDirectFBDataBuffer * );
core = va_arg( tag, CoreDFB * );
va_end( tag );
data->ref = 1;
data->buffer = buffer;
data->core = core;
/* Increase the data buffer reference counter. */
buffer->AddRef( buffer );
/* Create the PNG read handle. */
data->png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL );
if (!data->png_ptr)
goto error;
if (setjmp( data->png_ptr->jmpbuf )) {
D_ERROR( "ImageProvider/PNG: Error reading header!\n" );
goto error;
}
/* Create the PNG info handle. */
data->info_ptr = png_create_info_struct( data->png_ptr );
if (!data->info_ptr)
goto error;
/* Setup progressive image loading. */
png_set_progressive_read_fn( data->png_ptr, data,
png_info_callback,
png_row_callback,
png_end_callback );
/* Read until info callback is called. */
ret = push_data_until_stage( data, STAGE_INFO, 64 );
if (ret)
goto error;
thiz->AddRef = IDirectFBImageProvider_PNG_AddRef;
thiz->Release = IDirectFBImageProvider_PNG_Release;
thiz->RenderTo = IDirectFBImageProvider_PNG_RenderTo;
thiz->SetRenderCallback = IDirectFBImageProvider_PNG_SetRenderCallback;
thiz->GetImageDescription = IDirectFBImageProvider_PNG_GetImageDescription;
thiz->GetSurfaceDescription = IDirectFBImageProvider_PNG_GetSurfaceDescription;
return DFB_OK;
error:
if (data->png_ptr)
png_destroy_read_struct( &data->png_ptr, &data->info_ptr, NULL );
buffer->Release( buffer );
if (data->image)
D_FREE( data->image );
DIRECT_DEALLOCATE_INTERFACE(thiz);
return ret;
}
