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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <drm_fourcc.h>
#include <fcntl.h>
#include <gbm.h>
#include <sys/mman.h>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/logging.h"
#include "base/message_loop/message_pump_type.h"
#include "base/numerics/safe_conversions.h"
#include "base/task/single_thread_task_executor.h"
#include "components/exo/wayland/clients/client_base.h"
#include "components/exo/wayland/clients/client_helper.h"
namespace exo {
namespace wayland {
namespace clients {
namespace {
void FrameCallback(void* data, wl_callback* callback, uint32_t time) {
bool* callback_pending = static_cast<bool*>(data);
*callback_pending = false;
}
} // namespace
class YuvClient : public ClientBase {
public:
YuvClient() = default;
bool WriteSolidColor(gbm_bo* bo, SkColor color);
void Run(const ClientBase::InitParams& params);
};
bool YuvClient::WriteSolidColor(gbm_bo* bo, SkColor color) {
for (size_t i = 0; i < static_cast<size_t>(gbm_bo_get_plane_count(bo)); ++i) {
base::ScopedFD fd(gbm_bo_get_plane_fd(bo, i));
uint32_t stride = gbm_bo_get_stride_for_plane(bo, i);
uint32_t offset = gbm_bo_get_offset(bo, i);
uint32_t map_size = gbm_bo_get_plane_size(bo, i) + offset;
void* void_data = mmap(nullptr, map_size, (PROT_READ | PROT_WRITE),
MAP_SHARED, fd.get(), 0);
if (void_data == MAP_FAILED) {
LOG(ERROR) << "Failed mmap().";
return false;
}
uint8_t* data = static_cast<uint8_t*>(void_data) + offset;
uint8_t yuv[] = {
base::ClampRound<uint8_t>((0.257 * SkColorGetR(color)) +
(0.504 * SkColorGetG(color)) +
(0.098 * SkColorGetB(color)) + 16),
base::ClampRound<uint8_t>(-(0.148 * SkColorGetR(color)) -
(0.291 * SkColorGetG(color)) +
(0.439 * SkColorGetB(color)) + 128),
base::ClampRound<uint8_t>((0.439 * SkColorGetR(color)) -
(0.368 * SkColorGetG(color)) -
(0.071 * SkColorGetB(color)) + 128)};
if (i == 0) {
for (int y = 0; y < size_.height(); ++y) {
for (int x = 0; x < size_.width(); ++x) {
data[stride * y + x] = yuv[0];
}
}
} else {
for (int y = 0; y < size_.height() / 2; ++y) {
for (int x = 0; x < size_.width() / 2; ++x) {
data[stride * y + x * 2] = yuv[1];
data[stride * y + x * 2 + 1] = yuv[2];
}
}
}
int ret = munmap(void_data, map_size);
if (ret) {
LOG(ERROR) << "Failed munmap().";
return false;
}
}
return true;
}
void YuvClient::Run(const ClientBase::InitParams& params) {
if (!ClientBase::Init(params))
return;
bool callback_pending = false;
std::unique_ptr<wl_callback> frame_callback;
wl_callback_listener frame_listener = {FrameCallback};
size_t frame_number = 0;
do {
if (callback_pending)
continue;
frame_number++;
Buffer* buffer = DequeueBuffer();
if (!buffer) {
LOG(ERROR) << "Can't find free buffer";
return;
}
const SkColor kColors[] = {SK_ColorBLUE, SK_ColorGREEN, SK_ColorRED,
SK_ColorYELLOW, SK_ColorCYAN, SK_ColorMAGENTA};
if (!WriteSolidColor(buffer->bo.get(),
kColors[frame_number % buffers_.size()]))
return;
wl_surface_set_buffer_scale(surface_.get(), scale_);
wl_surface_set_buffer_transform(surface_.get(), transform_);
wl_surface_damage(surface_.get(), 0, 0, surface_size_.width(),
surface_size_.height());
wl_surface_attach(surface_.get(), buffer->buffer.get(), 0, 0);
frame_callback.reset(wl_surface_frame(surface_.get()));
wl_callback_add_listener(frame_callback.get(), &frame_listener,
&callback_pending);
callback_pending = true;
wl_surface_commit(surface_.get());
wl_display_flush(display_.get());
} while (wl_display_dispatch(display_.get()) != -1);
}
} // namespace clients
} // namespace wayland
} // namespace exo
int main(int argc, char* argv[]) {
base::AtExitManager exit_manager;
base::CommandLine::Init(argc, argv);
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
exo::wayland::clients::ClientBase::InitParams params;
params.use_drm = true;
params.num_buffers = 8; // Allow up to 8 buffers by default.
if (!params.FromCommandLine(*command_line))
return 1;
if (!params.use_drm) {
LOG(ERROR) << "Missing --use-drm parameter which is required for buffer "
"allocation";
return 1;
}
// TODO(dcastagna): Support other YUV formats.
params.drm_format = DRM_FORMAT_NV12;
params.bo_usage =
GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR | GBM_BO_USE_TEXTURING;
base::SingleThreadTaskExecutor main_task_executor(base::MessagePumpType::UI);
exo::wayland::clients::YuvClient client;
client.Run(params);
return 0;
}
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