| // Copyright 2013 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 "content/common/gpu/media/rendering_helper.h" |
| |
| #include <algorithm> |
| #include <numeric> |
| #include <vector> |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/command_line.h" |
| #include "base/mac/scoped_nsautorelease_pool.h" |
| #include "base/message_loop/message_loop.h" |
| #include "base/strings/stringize_macros.h" |
| #include "base/synchronization/waitable_event.h" |
| #include "base/time/time.h" |
| #include "ui/gl/gl_context.h" |
| #include "ui/gl/gl_implementation.h" |
| #include "ui/gl/gl_surface.h" |
| #include "ui/gl/gl_surface_egl.h" |
| #include "ui/gl/gl_surface_glx.h" |
| |
| #if defined(OS_WIN) |
| #include <windows.h> |
| #endif |
| |
| #if defined(USE_X11) |
| #include "ui/gfx/x/x11_types.h" |
| #endif |
| |
| #if !defined(OS_WIN) && defined(ARCH_CPU_X86_FAMILY) |
| #define GL_VARIANT_GLX 1 |
| #else |
| #define GL_VARIANT_EGL 1 |
| #endif |
| |
| // Helper for Shader creation. |
| static void CreateShader(GLuint program, |
| GLenum type, |
| const char* source, |
| int size) { |
| GLuint shader = glCreateShader(type); |
| glShaderSource(shader, 1, &source, &size); |
| glCompileShader(shader); |
| int result = GL_FALSE; |
| glGetShaderiv(shader, GL_COMPILE_STATUS, &result); |
| if (!result) { |
| char log[4096]; |
| glGetShaderInfoLog(shader, arraysize(log), NULL, log); |
| LOG(FATAL) << log; |
| } |
| glAttachShader(program, shader); |
| glDeleteShader(shader); |
| CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR); |
| } |
| |
| namespace content { |
| |
| RenderingHelperParams::RenderingHelperParams() |
| : rendering_fps(0), warm_up_iterations(0), render_as_thumbnails(false) { |
| } |
| |
| RenderingHelperParams::~RenderingHelperParams() {} |
| |
| VideoFrameTexture::VideoFrameTexture(uint32 texture_target, |
| uint32 texture_id, |
| const base::Closure& no_longer_needed_cb) |
| : texture_target_(texture_target), |
| texture_id_(texture_id), |
| no_longer_needed_cb_(no_longer_needed_cb) { |
| DCHECK(!no_longer_needed_cb_.is_null()); |
| } |
| |
| VideoFrameTexture::~VideoFrameTexture() { |
| base::ResetAndReturn(&no_longer_needed_cb_).Run(); |
| } |
| |
| RenderingHelper::RenderedVideo::RenderedVideo() |
| : is_flushing(false), frames_to_drop(0) { |
| } |
| |
| RenderingHelper::RenderedVideo::~RenderedVideo() { |
| } |
| |
| // static |
| bool RenderingHelper::InitializeOneOff() { |
| base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess(); |
| #if GL_VARIANT_GLX |
| cmd_line->AppendSwitchASCII(switches::kUseGL, |
| gfx::kGLImplementationDesktopName); |
| #else |
| cmd_line->AppendSwitchASCII(switches::kUseGL, gfx::kGLImplementationEGLName); |
| #endif |
| return gfx::GLSurface::InitializeOneOff(); |
| } |
| |
| RenderingHelper::RenderingHelper() { |
| window_ = gfx::kNullAcceleratedWidget; |
| Clear(); |
| } |
| |
| RenderingHelper::~RenderingHelper() { |
| CHECK_EQ(videos_.size(), 0U) << "Must call UnInitialize before dtor."; |
| Clear(); |
| } |
| |
| void RenderingHelper::Initialize(const RenderingHelperParams& params, |
| base::WaitableEvent* done) { |
| // Use videos_.size() != 0 as a proxy for the class having already been |
| // Initialize()'d, and UnInitialize() before continuing. |
| if (videos_.size()) { |
| base::WaitableEvent done(false, false); |
| UnInitialize(&done); |
| done.Wait(); |
| } |
| |
| render_task_.Reset( |
| base::Bind(&RenderingHelper::RenderContent, base::Unretained(this))); |
| |
| frame_duration_ = params.rendering_fps > 0 |
| ? base::TimeDelta::FromSeconds(1) / params.rendering_fps |
| : base::TimeDelta(); |
| |
| render_as_thumbnails_ = params.render_as_thumbnails; |
| message_loop_ = base::MessageLoop::current(); |
| |
| #if defined(OS_WIN) |
| screen_size_ = |
| gfx::Size(GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN)); |
| window_ = CreateWindowEx(0, |
| L"Static", |
| L"VideoDecodeAcceleratorTest", |
| WS_OVERLAPPEDWINDOW | WS_VISIBLE, |
| 0, |
| 0, |
| screen_size_.width(), |
| screen_size_.height(), |
| NULL, |
| NULL, |
| NULL, |
| NULL); |
| #elif defined(USE_X11) |
| Display* display = gfx::GetXDisplay(); |
| Screen* screen = DefaultScreenOfDisplay(display); |
| screen_size_ = gfx::Size(XWidthOfScreen(screen), XHeightOfScreen(screen)); |
| |
| CHECK(display); |
| |
| XSetWindowAttributes window_attributes; |
| memset(&window_attributes, 0, sizeof(window_attributes)); |
| window_attributes.background_pixel = |
| BlackPixel(display, DefaultScreen(display)); |
| window_attributes.override_redirect = true; |
| int depth = DefaultDepth(display, DefaultScreen(display)); |
| |
| window_ = XCreateWindow(display, |
| DefaultRootWindow(display), |
| 0, |
| 0, |
| screen_size_.width(), |
| screen_size_.height(), |
| 0 /* border width */, |
| depth, |
| CopyFromParent /* class */, |
| CopyFromParent /* visual */, |
| (CWBackPixel | CWOverrideRedirect), |
| &window_attributes); |
| XStoreName(display, window_, "VideoDecodeAcceleratorTest"); |
| XSelectInput(display, window_, ExposureMask); |
| XMapWindow(display, window_); |
| #else |
| #error unknown platform |
| #endif |
| CHECK(window_ != gfx::kNullAcceleratedWidget); |
| |
| gl_surface_ = gfx::GLSurface::CreateViewGLSurface(window_); |
| gl_context_ = gfx::GLContext::CreateGLContext( |
| NULL, gl_surface_.get(), gfx::PreferIntegratedGpu); |
| gl_context_->MakeCurrent(gl_surface_.get()); |
| |
| CHECK_GT(params.window_sizes.size(), 0U); |
| videos_.resize(params.window_sizes.size()); |
| LayoutRenderingAreas(params.window_sizes); |
| |
| if (render_as_thumbnails_) { |
| CHECK_EQ(videos_.size(), 1U); |
| |
| GLint max_texture_size; |
| glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size); |
| CHECK_GE(max_texture_size, params.thumbnails_page_size.width()); |
| CHECK_GE(max_texture_size, params.thumbnails_page_size.height()); |
| |
| thumbnails_fbo_size_ = params.thumbnails_page_size; |
| thumbnail_size_ = params.thumbnail_size; |
| |
| glGenFramebuffersEXT(1, &thumbnails_fbo_id_); |
| glGenTextures(1, &thumbnails_texture_id_); |
| glBindTexture(GL_TEXTURE_2D, thumbnails_texture_id_); |
| glTexImage2D(GL_TEXTURE_2D, |
| 0, |
| GL_RGB, |
| thumbnails_fbo_size_.width(), |
| thumbnails_fbo_size_.height(), |
| 0, |
| GL_RGB, |
| GL_UNSIGNED_SHORT_5_6_5, |
| NULL); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| glBindTexture(GL_TEXTURE_2D, 0); |
| |
| glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_); |
| glFramebufferTexture2DEXT(GL_FRAMEBUFFER, |
| GL_COLOR_ATTACHMENT0, |
| GL_TEXTURE_2D, |
| thumbnails_texture_id_, |
| 0); |
| |
| GLenum fb_status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER); |
| CHECK(fb_status == GL_FRAMEBUFFER_COMPLETE) << fb_status; |
| glClearColor(0.0f, 0.0f, 0.0f, 1.0f); |
| glClear(GL_COLOR_BUFFER_BIT); |
| glBindFramebufferEXT(GL_FRAMEBUFFER, 0); |
| } |
| |
| // These vertices and texture coords. map (0,0) in the texture to the |
| // bottom left of the viewport. Since we get the video frames with the |
| // the top left at (0,0) we need to flip the texture y coordinate |
| // in the vertex shader for this to be rendered the right way up. |
| // In the case of thumbnail rendering we use the same vertex shader |
| // to render the FBO the screen, where we do not want this flipping. |
| static const float kVertices[] = |
| { -1.f, 1.f, -1.f, -1.f, 1.f, 1.f, 1.f, -1.f, }; |
| static const float kTextureCoords[] = { 0, 1, 0, 0, 1, 1, 1, 0, }; |
| static const char kVertexShader[] = STRINGIZE( |
| varying vec2 interp_tc; |
| attribute vec4 in_pos; |
| attribute vec2 in_tc; |
| uniform bool tex_flip; |
| void main() { |
| if (tex_flip) |
| interp_tc = vec2(in_tc.x, 1.0 - in_tc.y); |
| else |
| interp_tc = in_tc; |
| gl_Position = in_pos; |
| }); |
| |
| #if GL_VARIANT_EGL |
| static const char kFragmentShader[] = |
| "#extension GL_OES_EGL_image_external : enable\n" |
| "precision mediump float;\n" |
| "varying vec2 interp_tc;\n" |
| "uniform sampler2D tex;\n" |
| "#ifdef GL_OES_EGL_image_external\n" |
| "uniform samplerExternalOES tex_external;\n" |
| "#endif\n" |
| "void main() {\n" |
| " vec4 color = texture2D(tex, interp_tc);\n" |
| "#ifdef GL_OES_EGL_image_external\n" |
| " color += texture2D(tex_external, interp_tc);\n" |
| "#endif\n" |
| " gl_FragColor = color;\n" |
| "}\n"; |
| #else |
| static const char kFragmentShader[] = STRINGIZE( |
| varying vec2 interp_tc; |
| uniform sampler2D tex; |
| void main() { |
| gl_FragColor = texture2D(tex, interp_tc); |
| }); |
| #endif |
| program_ = glCreateProgram(); |
| CreateShader( |
| program_, GL_VERTEX_SHADER, kVertexShader, arraysize(kVertexShader)); |
| CreateShader(program_, |
| GL_FRAGMENT_SHADER, |
| kFragmentShader, |
| arraysize(kFragmentShader)); |
| glLinkProgram(program_); |
| int result = GL_FALSE; |
| glGetProgramiv(program_, GL_LINK_STATUS, &result); |
| if (!result) { |
| char log[4096]; |
| glGetShaderInfoLog(program_, arraysize(log), NULL, log); |
| LOG(FATAL) << log; |
| } |
| glUseProgram(program_); |
| glDeleteProgram(program_); |
| |
| glUniform1i(glGetUniformLocation(program_, "tex_flip"), 0); |
| glUniform1i(glGetUniformLocation(program_, "tex"), 0); |
| GLint tex_external = glGetUniformLocation(program_, "tex_external"); |
| if (tex_external != -1) { |
| glUniform1i(tex_external, 1); |
| } |
| int pos_location = glGetAttribLocation(program_, "in_pos"); |
| glEnableVertexAttribArray(pos_location); |
| glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, kVertices); |
| int tc_location = glGetAttribLocation(program_, "in_tc"); |
| glEnableVertexAttribArray(tc_location); |
| glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0, kTextureCoords); |
| |
| if (frame_duration_ != base::TimeDelta()) |
| WarmUpRendering(params.warm_up_iterations); |
| |
| // It's safe to use Unretained here since |rendering_thread_| will be stopped |
| // in VideoDecodeAcceleratorTest.TearDown(), while the |rendering_helper_| is |
| // a member of that class. (See video_decode_accelerator_unittest.cc.) |
| gl_surface_->GetVSyncProvider()->GetVSyncParameters(base::Bind( |
| &RenderingHelper::UpdateVSyncParameters, base::Unretained(this), done)); |
| } |
| |
| // The rendering for the first few frames is slow (e.g., 100ms on Peach Pit). |
| // This affects the numbers measured in the performance test. We try to render |
| // several frames here to warm up the rendering. |
| void RenderingHelper::WarmUpRendering(int warm_up_iterations) { |
| unsigned int texture_id; |
| scoped_ptr<GLubyte[]> emptyData(new GLubyte[screen_size_.GetArea() * 2]); |
| glGenTextures(1, &texture_id); |
| glBindTexture(GL_TEXTURE_2D, texture_id); |
| glTexImage2D(GL_TEXTURE_2D, |
| 0, |
| GL_RGB, |
| screen_size_.width(), |
| screen_size_.height(), |
| 0, |
| GL_RGB, |
| GL_UNSIGNED_SHORT_5_6_5, |
| emptyData.get()); |
| for (int i = 0; i < warm_up_iterations; ++i) { |
| RenderTexture(GL_TEXTURE_2D, texture_id); |
| gl_surface_->SwapBuffers(); |
| } |
| glDeleteTextures(1, &texture_id); |
| } |
| |
| void RenderingHelper::UnInitialize(base::WaitableEvent* done) { |
| CHECK_EQ(base::MessageLoop::current(), message_loop_); |
| |
| render_task_.Cancel(); |
| |
| if (render_as_thumbnails_) { |
| glDeleteTextures(1, &thumbnails_texture_id_); |
| glDeleteFramebuffersEXT(1, &thumbnails_fbo_id_); |
| } |
| |
| gl_context_->ReleaseCurrent(gl_surface_.get()); |
| gl_context_ = NULL; |
| gl_surface_ = NULL; |
| |
| Clear(); |
| done->Signal(); |
| } |
| |
| void RenderingHelper::CreateTexture(uint32 texture_target, |
| uint32* texture_id, |
| const gfx::Size& size, |
| base::WaitableEvent* done) { |
| if (base::MessageLoop::current() != message_loop_) { |
| message_loop_->PostTask(FROM_HERE, |
| base::Bind(&RenderingHelper::CreateTexture, |
| base::Unretained(this), |
| texture_target, |
| texture_id, |
| size, |
| done)); |
| return; |
| } |
| glGenTextures(1, texture_id); |
| glBindTexture(texture_target, *texture_id); |
| if (texture_target == GL_TEXTURE_2D) { |
| glTexImage2D(GL_TEXTURE_2D, |
| 0, |
| GL_RGBA, |
| size.width(), |
| size.height(), |
| 0, |
| GL_RGBA, |
| GL_UNSIGNED_BYTE, |
| NULL); |
| } |
| glTexParameteri(texture_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| glTexParameteri(texture_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| // OpenGLES2.0.25 section 3.8.2 requires CLAMP_TO_EDGE for NPOT textures. |
| glTexParameteri(texture_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
| glTexParameteri(texture_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
| CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR); |
| done->Signal(); |
| } |
| |
| // Helper function to set GL viewport. |
| static inline void GLSetViewPort(const gfx::Rect& area) { |
| glViewport(area.x(), area.y(), area.width(), area.height()); |
| glScissor(area.x(), area.y(), area.width(), area.height()); |
| } |
| |
| void RenderingHelper::RenderThumbnail(uint32 texture_target, |
| uint32 texture_id) { |
| CHECK_EQ(base::MessageLoop::current(), message_loop_); |
| const int width = thumbnail_size_.width(); |
| const int height = thumbnail_size_.height(); |
| const int thumbnails_in_row = thumbnails_fbo_size_.width() / width; |
| const int thumbnails_in_column = thumbnails_fbo_size_.height() / height; |
| const int row = (frame_count_ / thumbnails_in_row) % thumbnails_in_column; |
| const int col = frame_count_ % thumbnails_in_row; |
| |
| gfx::Rect area(col * width, row * height, width, height); |
| |
| glUniform1i(glGetUniformLocation(program_, "tex_flip"), 0); |
| glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_); |
| GLSetViewPort(area); |
| RenderTexture(texture_target, texture_id); |
| glBindFramebufferEXT(GL_FRAMEBUFFER, 0); |
| |
| // Need to flush the GL commands before we return the tnumbnail texture to |
| // the decoder. |
| glFlush(); |
| ++frame_count_; |
| } |
| |
| void RenderingHelper::QueueVideoFrame( |
| size_t window_id, |
| scoped_refptr<VideoFrameTexture> video_frame) { |
| CHECK_EQ(base::MessageLoop::current(), message_loop_); |
| RenderedVideo* video = &videos_[window_id]; |
| DCHECK(!video->is_flushing); |
| |
| video->pending_frames.push(video_frame); |
| |
| if (video->frames_to_drop > 0 && video->pending_frames.size() > 1) { |
| --video->frames_to_drop; |
| video->pending_frames.pop(); |
| } |
| |
| // Schedules the first RenderContent() if need. |
| if (scheduled_render_time_.is_null()) { |
| scheduled_render_time_ = base::TimeTicks::Now(); |
| message_loop_->PostTask(FROM_HERE, render_task_.callback()); |
| } |
| } |
| |
| void RenderingHelper::RenderTexture(uint32 texture_target, uint32 texture_id) { |
| // The ExternalOES sampler is bound to GL_TEXTURE1 and the Texture2D sampler |
| // is bound to GL_TEXTURE0. |
| if (texture_target == GL_TEXTURE_2D) { |
| glActiveTexture(GL_TEXTURE0 + 0); |
| } else if (texture_target == GL_TEXTURE_EXTERNAL_OES) { |
| glActiveTexture(GL_TEXTURE0 + 1); |
| } |
| glBindTexture(texture_target, texture_id); |
| glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
| glBindTexture(texture_target, 0); |
| CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR); |
| } |
| |
| void RenderingHelper::DeleteTexture(uint32 texture_id) { |
| CHECK_EQ(base::MessageLoop::current(), message_loop_); |
| glDeleteTextures(1, &texture_id); |
| CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR); |
| } |
| |
| void* RenderingHelper::GetGLContext() { |
| return gl_context_->GetHandle(); |
| } |
| |
| void* RenderingHelper::GetGLDisplay() { |
| return gl_surface_->GetDisplay(); |
| } |
| |
| void RenderingHelper::Clear() { |
| videos_.clear(); |
| message_loop_ = NULL; |
| gl_context_ = NULL; |
| gl_surface_ = NULL; |
| |
| render_as_thumbnails_ = false; |
| frame_count_ = 0; |
| thumbnails_fbo_id_ = 0; |
| thumbnails_texture_id_ = 0; |
| |
| #if defined(OS_WIN) |
| if (window_) |
| DestroyWindow(window_); |
| #else |
| // Destroy resources acquired in Initialize, in reverse-acquisition order. |
| if (window_) { |
| CHECK(XUnmapWindow(gfx::GetXDisplay(), window_)); |
| CHECK(XDestroyWindow(gfx::GetXDisplay(), window_)); |
| } |
| #endif |
| window_ = gfx::kNullAcceleratedWidget; |
| } |
| |
| void RenderingHelper::GetThumbnailsAsRGB(std::vector<unsigned char>* rgb, |
| bool* alpha_solid, |
| base::WaitableEvent* done) { |
| CHECK(render_as_thumbnails_); |
| |
| const size_t num_pixels = thumbnails_fbo_size_.GetArea(); |
| std::vector<unsigned char> rgba; |
| rgba.resize(num_pixels * 4); |
| glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_); |
| glPixelStorei(GL_PACK_ALIGNMENT, 1); |
| // We can only count on GL_RGBA/GL_UNSIGNED_BYTE support. |
| glReadPixels(0, |
| 0, |
| thumbnails_fbo_size_.width(), |
| thumbnails_fbo_size_.height(), |
| GL_RGBA, |
| GL_UNSIGNED_BYTE, |
| &rgba[0]); |
| glBindFramebufferEXT(GL_FRAMEBUFFER, 0); |
| rgb->resize(num_pixels * 3); |
| // Drop the alpha channel, but check as we go that it is all 0xff. |
| bool solid = true; |
| unsigned char* rgb_ptr = &((*rgb)[0]); |
| unsigned char* rgba_ptr = &rgba[0]; |
| for (size_t i = 0; i < num_pixels; ++i) { |
| *rgb_ptr++ = *rgba_ptr++; |
| *rgb_ptr++ = *rgba_ptr++; |
| *rgb_ptr++ = *rgba_ptr++; |
| solid = solid && (*rgba_ptr == 0xff); |
| rgba_ptr++; |
| } |
| *alpha_solid = solid; |
| |
| done->Signal(); |
| } |
| |
| void RenderingHelper::Flush(size_t window_id) { |
| videos_[window_id].is_flushing = true; |
| } |
| |
| void RenderingHelper::RenderContent() { |
| CHECK_EQ(base::MessageLoop::current(), message_loop_); |
| |
| // Update the VSync params. |
| // |
| // It's safe to use Unretained here since |rendering_thread_| will be stopped |
| // in VideoDecodeAcceleratorTest.TearDown(), while the |rendering_helper_| is |
| // a member of that class. (See video_decode_accelerator_unittest.cc.) |
| gl_surface_->GetVSyncProvider()->GetVSyncParameters( |
| base::Bind(&RenderingHelper::UpdateVSyncParameters, |
| base::Unretained(this), |
| static_cast<base::WaitableEvent*>(NULL))); |
| |
| glUniform1i(glGetUniformLocation(program_, "tex_flip"), 1); |
| |
| // Frames that will be returned to the client (via the no_longer_needed_cb) |
| // after this vector falls out of scope at the end of this method. We need |
| // to keep references to them until after SwapBuffers() call below. |
| std::vector<scoped_refptr<VideoFrameTexture> > frames_to_be_returned; |
| bool need_swap_buffer = false; |
| if (render_as_thumbnails_) { |
| // In render_as_thumbnails_ mode, we render the FBO content on the |
| // screen instead of the decoded textures. |
| GLSetViewPort(videos_[0].render_area); |
| RenderTexture(GL_TEXTURE_2D, thumbnails_texture_id_); |
| need_swap_buffer = true; |
| } else { |
| for (RenderedVideo& video : videos_) { |
| if (video.pending_frames.empty()) |
| continue; |
| need_swap_buffer = true; |
| scoped_refptr<VideoFrameTexture> frame = video.pending_frames.front(); |
| GLSetViewPort(video.render_area); |
| RenderTexture(frame->texture_target(), frame->texture_id()); |
| |
| if (video.pending_frames.size() > 1 || video.is_flushing) { |
| frames_to_be_returned.push_back(video.pending_frames.front()); |
| video.pending_frames.pop(); |
| } else { |
| ++video.frames_to_drop; |
| } |
| } |
| } |
| |
| if (need_swap_buffer) |
| gl_surface_->SwapBuffers(); |
| |
| ScheduleNextRenderContent(); |
| } |
| |
| // Helper function for the LayoutRenderingAreas(). The |lengths| are the |
| // heights(widths) of the rows(columns). It scales the elements in |
| // |lengths| proportionally so that the sum of them equal to |total_length|. |
| // It also outputs the coordinates of the rows(columns) to |offsets|. |
| static void ScaleAndCalculateOffsets(std::vector<int>* lengths, |
| std::vector<int>* offsets, |
| int total_length) { |
| int sum = std::accumulate(lengths->begin(), lengths->end(), 0); |
| for (size_t i = 0; i < lengths->size(); ++i) { |
| lengths->at(i) = lengths->at(i) * total_length / sum; |
| offsets->at(i) = (i == 0) ? 0 : offsets->at(i - 1) + lengths->at(i - 1); |
| } |
| } |
| |
| void RenderingHelper::LayoutRenderingAreas( |
| const std::vector<gfx::Size>& window_sizes) { |
| // Find the number of colums and rows. |
| // The smallest n * n or n * (n + 1) > number of windows. |
| size_t cols = sqrt(videos_.size() - 1) + 1; |
| size_t rows = (videos_.size() + cols - 1) / cols; |
| |
| // Find the widths and heights of the grid. |
| std::vector<int> widths(cols); |
| std::vector<int> heights(rows); |
| std::vector<int> offset_x(cols); |
| std::vector<int> offset_y(rows); |
| |
| for (size_t i = 0; i < window_sizes.size(); ++i) { |
| const gfx::Size& size = window_sizes[i]; |
| widths[i % cols] = std::max(widths[i % cols], size.width()); |
| heights[i / cols] = std::max(heights[i / cols], size.height()); |
| } |
| |
| ScaleAndCalculateOffsets(&widths, &offset_x, screen_size_.width()); |
| ScaleAndCalculateOffsets(&heights, &offset_y, screen_size_.height()); |
| |
| // Put each render_area_ in the center of each cell. |
| for (size_t i = 0; i < window_sizes.size(); ++i) { |
| const gfx::Size& size = window_sizes[i]; |
| float scale = |
| std::min(static_cast<float>(widths[i % cols]) / size.width(), |
| static_cast<float>(heights[i / cols]) / size.height()); |
| |
| // Don't scale up the texture. |
| scale = std::min(1.0f, scale); |
| |
| size_t w = scale * size.width(); |
| size_t h = scale * size.height(); |
| size_t x = offset_x[i % cols] + (widths[i % cols] - w) / 2; |
| size_t y = offset_y[i / cols] + (heights[i / cols] - h) / 2; |
| videos_[i].render_area = gfx::Rect(x, y, w, h); |
| } |
| } |
| |
| void RenderingHelper::UpdateVSyncParameters(base::WaitableEvent* done, |
| const base::TimeTicks timebase, |
| const base::TimeDelta interval) { |
| vsync_timebase_ = timebase; |
| vsync_interval_ = interval; |
| |
| if (done) |
| done->Signal(); |
| } |
| |
| void RenderingHelper::DropOneFrameForAllVideos() { |
| for (RenderedVideo& video : videos_) { |
| if (video.pending_frames.empty()) |
| continue; |
| |
| if (video.pending_frames.size() > 1 || video.is_flushing) { |
| video.pending_frames.pop(); |
| } else { |
| ++video.frames_to_drop; |
| } |
| } |
| } |
| |
| void RenderingHelper::ScheduleNextRenderContent() { |
| scheduled_render_time_ += frame_duration_; |
| |
| // Schedules the next RenderContent() at latest VSYNC before the |
| // |scheduled_render_time_|. |
| base::TimeTicks now = base::TimeTicks::Now(); |
| base::TimeTicks target = |
| std::max(now + vsync_interval_, scheduled_render_time_); |
| |
| int64 intervals = (target - vsync_timebase_) / vsync_interval_; |
| target = vsync_timebase_ + intervals * vsync_interval_; |
| |
| // When the rendering falls behind, drops frames. |
| while (scheduled_render_time_ < target) { |
| scheduled_render_time_ += frame_duration_; |
| DropOneFrameForAllVideos(); |
| } |
| |
| message_loop_->PostDelayedTask( |
| FROM_HERE, render_task_.callback(), target - now); |
| } |
| } // namespace content |