blob: 44dc13b26d266a7853264f267f89eb05d32955af [file] [log] [blame]
// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <directfb.h>
#include "starboard/blitter.h"
#include "starboard/log.h"
#include "starboard/memory.h"
#include "starboard/shared/directfb/blitter_internal.h"
namespace {
int WordToByteOrder(int bytes_per_pixel, int byte_index) {
// Since DirectFB stores color in word-order but we wish to output in
// byte-order fomat, we perform that conversion here.
#if SB_IS_LITTLE_ENDIAN
return bytes_per_pixel - 1 - byte_index;
#else
return byte_index;
#endif
}
void SwizzlePixels(void* in_data,
void* out_data,
int width,
int height,
int in_bytes_per_pixel,
int in_pitch_in_bytes,
int out_pitch_in_bytes,
int channel_1,
int channel_2,
int channel_3,
int channel_4) {
uint8_t* in_data_bytes = static_cast<uint8_t*>(in_data);
uint8_t* out_data_bytes = static_cast<uint8_t*>(out_data);
bool needs_swizzle = true;
if (WordToByteOrder(in_bytes_per_pixel, channel_1) == 0 &&
WordToByteOrder(in_bytes_per_pixel, channel_2) == 1 &&
WordToByteOrder(in_bytes_per_pixel, channel_3) == 2 &&
WordToByteOrder(in_bytes_per_pixel, channel_4) == 3) {
SB_DCHECK(in_bytes_per_pixel == 4);
needs_swizzle = false;
}
for (int y = 0; y < height; ++y) {
if (needs_swizzle) {
for (int x = 0; x < width; ++x) {
out_data_bytes[0] =
in_data_bytes[WordToByteOrder(in_bytes_per_pixel, channel_1)];
out_data_bytes[1] =
in_data_bytes[WordToByteOrder(in_bytes_per_pixel, channel_2)];
out_data_bytes[2] =
in_data_bytes[WordToByteOrder(in_bytes_per_pixel, channel_3)];
out_data_bytes[3] =
in_data_bytes[WordToByteOrder(in_bytes_per_pixel, channel_4)];
out_data_bytes += 4;
in_data_bytes += in_bytes_per_pixel;
}
// Increment through the gab between the input data pitch and its
// width * bpp.
in_data_bytes += in_pitch_in_bytes - width * in_bytes_per_pixel;
out_data_bytes += out_pitch_in_bytes - width * 4;
} else {
SbMemoryCopy(out_data_bytes, in_data_bytes, width * 4);
in_data_bytes += in_pitch_in_bytes;
out_data_bytes += out_pitch_in_bytes;
}
}
}
} // namespace
bool SbBlitterDownloadSurfacePixels(SbBlitterSurface surface,
SbBlitterPixelDataFormat pixel_format,
int pitch_in_bytes,
void* out_pixel_data) {
if (!SbBlitterIsSurfaceValid(surface)) {
SB_DLOG(ERROR) << __FUNCTION__ << ": Invalid surface.";
return false;
}
if (out_pixel_data == NULL) {
SB_DLOG(ERROR) << __FUNCTION__ << ": |out_pixel_data| cannot be NULL.";
return false;
}
if (!SbBlitterIsPixelFormatSupportedByDownloadSurfacePixels(surface,
pixel_format)) {
SB_DLOG(ERROR) << __FUNCTION__ << ": Unsupported pixel format.";
return false;
}
if (pitch_in_bytes <
surface->info.width * SbBlitterBytesPerPixelForFormat(pixel_format)) {
SB_DLOG(ERROR)
<< __FUNCTION__
<< ": Output pitch must be at least as large as (width * BPP).";
return false;
}
{
// Wait for all previously flushed draw calls to be executed.
starboard::ScopedLock lock(surface->device->mutex);
if (surface->device->dfb->WaitIdle(surface->device->dfb) != DFB_OK) {
SB_DLOG(ERROR) << __FUNCTION__ << ": WaitIdle() failed.";
return false;
}
}
IDirectFBSurface* dfb_surface = surface->surface;
DFBSurfacePixelFormat surface_pixel_format;
dfb_surface->GetPixelFormat(dfb_surface, &surface_pixel_format);
// Lock the surface's pixels and then copy them out into the user's provided
// memory. Swizzel the pixel's bytes as we copy them out, if necessary.
void* data;
int surface_pitch_in_bytes;
if (dfb_surface->Lock(dfb_surface, DSLF_READ, &data,
&surface_pitch_in_bytes) != DFB_OK) {
SB_DLOG(ERROR) << __FUNCTION__ << ": Error calling Lock().";
return false;
}
switch (DFB_PIXELFORMAT_INDEX(surface_pixel_format)) {
case DFB_PIXELFORMAT_INDEX(DSPF_ARGB): {
switch (pixel_format) {
case kSbBlitterPixelDataFormatARGB8: {
SwizzlePixels(data, out_pixel_data, surface->info.width,
surface->info.height, 4, surface_pitch_in_bytes,
pitch_in_bytes, 0, 1, 2, 3);
} break;
case kSbBlitterPixelDataFormatBGRA8: {
SwizzlePixels(data, out_pixel_data, surface->info.width,
surface->info.height, 4, surface_pitch_in_bytes,
pitch_in_bytes, 3, 2, 1, 0);
} break;
case kSbBlitterPixelDataFormatRGBA8: {
SwizzlePixels(data, out_pixel_data, surface->info.width,
surface->info.height, 4, surface_pitch_in_bytes,
pitch_in_bytes, 1, 2, 3, 0);
} break;
default: { SB_NOTREACHED(); }
}
} break;
case DFB_PIXELFORMAT_INDEX(DSPF_A8): {
// Convert A8 to either ARGB, BGRA, or RGBA.
SwizzlePixels(data, out_pixel_data, surface->info.width,
surface->info.height, 1, surface_pitch_in_bytes,
pitch_in_bytes, 0, 0, 0, 0);
} break;
default: {
SB_DLOG(ERROR) << __FUNCTION__ << ": Unsupported pixel format index ("
<< DFB_PIXELFORMAT_INDEX(surface_pixel_format) << ").";
dfb_surface->Unlock(dfb_surface);
return false;
}
}
// Okay the copy is complete, unlock the pixels and carry on.
dfb_surface->Unlock(dfb_surface);
return true;
}