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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/ozone/demo/skia_renderer.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "third_party/skia/include/gpu/GrBackendSurface.h"
#include "third_party/skia/include/gpu/gl/GrGLAssembleInterface.h"
#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/init/gl_factory.h"
namespace ui {
namespace {
const GrGLInterface* GrGLCreateNativeInterface() {
return GrGLAssembleInterface(nullptr, [](void* ctx, const char name[]) {
return gl::GetGLProcAddress(name);
});
}
const char kUseDDL[] = "use-ddl";
} // namespace
SkiaRenderer::SkiaRenderer(gfx::AcceleratedWidget widget,
const scoped_refptr<gl::GLSurface>& surface,
const gfx::Size& size)
: RendererBase(widget, size),
gl_surface_(surface),
use_ddl_(base::CommandLine::ForCurrentProcess()->HasSwitch(kUseDDL)),
condition_variable_(&lock_),
weak_ptr_factory_(this) {}
SkiaRenderer::~SkiaRenderer() {
if (use_ddl_)
StopDDLRenderThread();
}
bool SkiaRenderer::Initialize() {
gl_context_ = gl::init::CreateGLContext(nullptr, gl_surface_.get(),
gl::GLContextAttribs());
if (!gl_context_.get()) {
LOG(FATAL) << "Failed to create GL context";
return false;
}
gl_surface_->Resize(size_, 1.f, gl::GLSurface::ColorSpace::UNSPECIFIED, true);
if (!gl_context_->MakeCurrent(gl_surface_.get())) {
LOG(FATAL) << "Failed to make GL context current";
return false;
}
auto native_interface =
sk_sp<const GrGLInterface>(GrGLCreateNativeInterface());
DCHECK(native_interface);
GrContextOptions options;
if (use_ddl_)
options.fExplicitlyAllocateGPUResources = GrContextOptions::Enable::kYes;
gr_context_ = GrContext::MakeGL(std::move(native_interface), options);
DCHECK(gr_context_);
PostRenderFrameTask(gfx::SwapResult::SWAP_ACK);
return true;
}
void SkiaRenderer::RenderFrame() {
TRACE_EVENT0("ozone", "SkiaRenderer::RenderFrame");
// LegacyFontHost will get LCD text and skia figures out what type to use.
SkSurfaceProps surface_props =
SkSurfaceProps(0, SkSurfaceProps::kLegacyFontHost_InitType);
if (!sk_surface_) {
GrGLFramebufferInfo framebuffer_info;
framebuffer_info.fFBOID = 0;
GrBackendRenderTarget render_target(size_.width(), size_.height(), 0, 8,
kRGBA_8888_GrPixelConfig,
framebuffer_info);
sk_surface_ = SkSurface::MakeFromBackendRenderTarget(
gr_context_.get(), render_target, kBottomLeft_GrSurfaceOrigin, nullptr,
&surface_props);
}
if (use_ddl_) {
StartDDLRenderThreadIfNecessary(sk_surface_.get());
auto ddl = GetDDL();
sk_surface_->draw(ddl.get());
} else {
Draw(sk_surface_->getCanvas(), NextFraction());
}
gr_context_->flush();
glFinish();
if (gl_surface_->SupportsAsyncSwap()) {
gl_surface_->SwapBuffersAsync(
base::BindRepeating(&SkiaRenderer::PostRenderFrameTask,
weak_ptr_factory_.GetWeakPtr()),
base::BindRepeating(&SkiaRenderer::OnPresentation,
weak_ptr_factory_.GetWeakPtr()));
} else {
PostRenderFrameTask(gl_surface_->SwapBuffers(base::BindRepeating(
&SkiaRenderer::OnPresentation, weak_ptr_factory_.GetWeakPtr())));
}
}
void SkiaRenderer::PostRenderFrameTask(gfx::SwapResult result) {
base::ThreadTaskRunnerHandle::Get()->PostTask(
FROM_HERE, base::BindRepeating(&SkiaRenderer::RenderFrame,
weak_ptr_factory_.GetWeakPtr()));
}
void SkiaRenderer::Draw(SkCanvas* canvas, float fraction) {
TRACE_EVENT0("ozone", "SkiaRenderer::Draw");
// Clear background
canvas->clear(SkColorSetARGB(255, 255 * fraction, 255 * (1 - fraction), 0));
SkPaint paint;
paint.setColor(SK_ColorRED);
// Draw a rectangle with red paint
SkRect rect = SkRect::MakeXYWH(10, 10, 128, 128);
canvas->drawRect(rect, paint);
// Set up a linear gradient and draw a circle
{
SkPoint linearPoints[] = {{0, 0}, {300, 300}};
SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK};
paint.setShader(SkGradientShader::MakeLinear(
linearPoints, linearColors, nullptr, 2, SkShader::kMirror_TileMode));
paint.setAntiAlias(true);
canvas->drawCircle(200, 200, 64, paint);
// Detach shader
paint.setShader(nullptr);
}
// Draw a message with a nice black paint
paint.setSubpixelText(true);
paint.setColor(SK_ColorBLACK);
paint.setTextSize(32);
canvas->save();
static const char message[] = "Hello Ozone";
static const char message_ddl[] = "Hello Ozone + DDL";
// Translate and rotate
canvas->translate(300, 300);
rotation_angle_ += 0.2f;
if (rotation_angle_ > 360) {
rotation_angle_ -= 360;
}
canvas->rotate(rotation_angle_);
const char* text = use_ddl_ ? message_ddl : message;
// Draw the text
canvas->drawText(text, strlen(text), 0, 0, paint);
canvas->restore();
}
void SkiaRenderer::StartDDLRenderThreadIfNecessary(SkSurface* sk_surface) {
DCHECK(use_ddl_);
if (ddl_render_thread_)
return;
DCHECK(!surface_charaterization_.isValid());
DCHECK(sk_surface);
if (!sk_surface->characterize(&surface_charaterization_))
LOG(FATAL) << "Failed to cheracterize the skia surface!";
ddl_render_thread_ =
std::make_unique<base::DelegateSimpleThread>(this, "DDLRenderThread");
ddl_render_thread_->Start();
}
void SkiaRenderer::StopDDLRenderThread() {
if (!ddl_render_thread_)
return;
{
base::AutoLock auto_lock_(lock_);
surface_charaterization_ = SkSurfaceCharacterization();
condition_variable_.Signal();
}
ddl_render_thread_->Join();
ddl_render_thread_ = nullptr;
while (!ddls_.empty())
ddls_.pop();
}
std::unique_ptr<SkDeferredDisplayList> SkiaRenderer::GetDDL() {
base::AutoLock auto_lock_(lock_);
DCHECK(surface_charaterization_.isValid());
// Wait until DDL is generated by DDL render thread.
while (ddls_.empty())
condition_variable_.Wait();
auto ddl = std::move(ddls_.front());
ddls_.pop();
condition_variable_.Signal();
return ddl;
}
void SkiaRenderer::Run() {
base::AutoLock auto_lock(lock_);
while (true) {
// Wait until ddls_ is consumed or surface_charaterization_ is reset.
constexpr size_t kMaxPendingDDLS = 4;
while (surface_charaterization_.isValid() &&
ddls_.size() == kMaxPendingDDLS)
condition_variable_.Wait();
if (!surface_charaterization_.isValid())
break;
DCHECK_LT(ddls_.size(), kMaxPendingDDLS);
SkDeferredDisplayListRecorder recorder(surface_charaterization_);
std::unique_ptr<SkDeferredDisplayList> ddl;
{
base::AutoUnlock auto_unlock(lock_);
Draw(recorder.getCanvas(), NextFraction());
ddl = recorder.detach();
}
ddls_.push(std::move(ddl));
condition_variable_.Signal();
}
}
void SkiaRenderer::OnPresentation(const gfx::PresentationFeedback& feedback) {
DCHECK(gl_surface_->SupportsPresentationCallback());
LOG_IF(ERROR, feedback.timestamp.is_null()) << "Last frame is discarded!";
}
} // namespace ui
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