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gl_renderer.cc
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gl_renderer.cc
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// Copyright 2010 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 "cc/output/gl_renderer.h"
#include <algorithm>
#include <limits>
#include <set>
#include <string>
#include <vector>
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "cc/base/math_util.h"
#include "cc/layers/video_layer_impl.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/compositor_frame_metadata.h"
#include "cc/output/context_provider.h"
#include "cc/output/copy_output_request.h"
#include "cc/output/geometry_binding.h"
#include "cc/output/gl_frame_data.h"
#include "cc/output/output_surface.h"
#include "cc/output/render_surface_filters.h"
#include "cc/quads/picture_draw_quad.h"
#include "cc/quads/render_pass.h"
#include "cc/quads/stream_video_draw_quad.h"
#include "cc/quads/texture_draw_quad.h"
#include "cc/resources/layer_quad.h"
#include "cc/resources/raster_worker_pool.h"
#include "cc/resources/scoped_resource.h"
#include "cc/resources/texture_mailbox_deleter.h"
#include "cc/trees/damage_tracker.h"
#include "cc/trees/proxy.h"
#include "cc/trees/single_thread_proxy.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/context_support.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "gpu/command_buffer/common/gpu_memory_allocation.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "third_party/skia/include/gpu/GrContext.h"
#include "third_party/skia/include/gpu/GrTexture.h"
#include "third_party/skia/include/gpu/SkGpuDevice.h"
#include "third_party/skia/include/gpu/SkGrTexturePixelRef.h"
#include "third_party/skia/include/gpu/gl/GrGLInterface.h"
#include "ui/gfx/quad_f.h"
#include "ui/gfx/rect_conversions.h"
using gpu::gles2::GLES2Interface;
namespace cc {
namespace {
class FallbackFence : public ResourceProvider::Fence {
public:
explicit FallbackFence(gpu::gles2::GLES2Interface* gl)
: gl_(gl), has_passed_(false) {}
// Overridden from ResourceProvider::Fence:
virtual bool HasPassed() OVERRIDE {
if (!has_passed_) {
has_passed_ = true;
Synchronize();
}
return true;
}
private:
virtual ~FallbackFence() {}
void Synchronize() {
TRACE_EVENT0("cc", "FallbackFence::Synchronize");
gl_->Finish();
}
gpu::gles2::GLES2Interface* gl_;
bool has_passed_;
DISALLOW_COPY_AND_ASSIGN(FallbackFence);
};
class OnDemandRasterTaskImpl : public Task {
public:
OnDemandRasterTaskImpl(PicturePileImpl* picture_pile,
SkBitmap* bitmap,
gfx::Rect content_rect,
float contents_scale)
: picture_pile_(picture_pile),
bitmap_(bitmap),
content_rect_(content_rect),
contents_scale_(contents_scale) {
DCHECK(picture_pile_);
DCHECK(bitmap_);
}
// Overridden from Task:
virtual void RunOnWorkerThread() OVERRIDE {
TRACE_EVENT0("cc", "OnDemandRasterTaskImpl::RunOnWorkerThread");
SkCanvas canvas(*bitmap_);
PicturePileImpl* picture_pile = picture_pile_->GetCloneForDrawingOnThread(
RasterWorkerPool::GetPictureCloneIndexForCurrentThread());
DCHECK(picture_pile);
picture_pile->RasterToBitmap(&canvas, content_rect_, contents_scale_, NULL);
}
protected:
virtual ~OnDemandRasterTaskImpl() {}
private:
PicturePileImpl* picture_pile_;
SkBitmap* bitmap_;
const gfx::Rect content_rect_;
const float contents_scale_;
DISALLOW_COPY_AND_ASSIGN(OnDemandRasterTaskImpl);
};
bool NeedsIOSurfaceReadbackWorkaround() {
#if defined(OS_MACOSX)
// This isn't strictly required in DumpRenderTree-mode when Mesa is used,
// but it doesn't seem to hurt.
return true;
#else
return false;
#endif
}
Float4 UVTransform(const TextureDrawQuad* quad) {
gfx::PointF uv0 = quad->uv_top_left;
gfx::PointF uv1 = quad->uv_bottom_right;
Float4 xform = {{uv0.x(), uv0.y(), uv1.x() - uv0.x(), uv1.y() - uv0.y()}};
if (quad->flipped) {
xform.data[1] = 1.0f - xform.data[1];
xform.data[3] = -xform.data[3];
}
return xform;
}
Float4 PremultipliedColor(SkColor color) {
const float factor = 1.0f / 255.0f;
const float alpha = SkColorGetA(color) * factor;
Float4 result = {
{SkColorGetR(color) * factor * alpha, SkColorGetG(color) * factor * alpha,
SkColorGetB(color) * factor * alpha, alpha}};
return result;
}
SamplerType SamplerTypeFromTextureTarget(GLenum target) {
switch (target) {
case GL_TEXTURE_2D:
return SamplerType2D;
case GL_TEXTURE_RECTANGLE_ARB:
return SamplerType2DRect;
case GL_TEXTURE_EXTERNAL_OES:
return SamplerTypeExternalOES;
default:
NOTREACHED();
return SamplerType2D;
}
}
// Smallest unit that impact anti-aliasing output. We use this to
// determine when anti-aliasing is unnecessary.
const float kAntiAliasingEpsilon = 1.0f / 1024.0f;
} // anonymous namespace
class GLRenderer::ScopedUseGrContext {
public:
static scoped_ptr<ScopedUseGrContext> Create(GLRenderer* renderer,
DrawingFrame* frame) {
if (!renderer->output_surface_->context_provider()->GrContext())
return scoped_ptr<ScopedUseGrContext>();
return make_scoped_ptr(new ScopedUseGrContext(renderer, frame));
}
~ScopedUseGrContext() { PassControlToGLRenderer(); }
GrContext* context() const {
return renderer_->output_surface_->context_provider()->GrContext();
}
private:
ScopedUseGrContext(GLRenderer* renderer, DrawingFrame* frame)
: renderer_(renderer), frame_(frame) {
PassControlToSkia();
}
void PassControlToSkia() { context()->resetContext(); }
void PassControlToGLRenderer() {
renderer_->RestoreGLState();
renderer_->RestoreFramebuffer(frame_);
}
GLRenderer* renderer_;
DrawingFrame* frame_;
DISALLOW_COPY_AND_ASSIGN(ScopedUseGrContext);
};
struct GLRenderer::PendingAsyncReadPixels {
PendingAsyncReadPixels() : buffer(0) {}
scoped_ptr<CopyOutputRequest> copy_request;
base::CancelableClosure finished_read_pixels_callback;
unsigned buffer;
private:
DISALLOW_COPY_AND_ASSIGN(PendingAsyncReadPixels);
};
class GLRenderer::SyncQuery {
public:
explicit SyncQuery(gpu::gles2::GLES2Interface* gl)
: gl_(gl), query_id_(0u), weak_ptr_factory_(this) {
gl_->GenQueriesEXT(1, &query_id_);
}
virtual ~SyncQuery() { gl_->DeleteQueriesEXT(1, &query_id_); }
scoped_refptr<ResourceProvider::Fence> Begin() {
DCHECK(!weak_ptr_factory_.HasWeakPtrs() || !IsPending());
// Invalidate weak pointer held by old fence.
weak_ptr_factory_.InvalidateWeakPtrs();
gl_->BeginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM, query_id_);
return make_scoped_refptr<ResourceProvider::Fence>(
new Fence(weak_ptr_factory_.GetWeakPtr()));
}
void End() { gl_->EndQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM); }
bool IsPending() {
unsigned available = 1;
gl_->GetQueryObjectuivEXT(
query_id_, GL_QUERY_RESULT_AVAILABLE_EXT, &available);
return !available;
}
private:
class Fence : public ResourceProvider::Fence {
public:
explicit Fence(base::WeakPtr<GLRenderer::SyncQuery> query)
: query_(query) {}
// Overridden from ResourceProvider::Fence:
virtual bool HasPassed() OVERRIDE {
return !query_ || !query_->IsPending();
}
private:
virtual ~Fence() {}
base::WeakPtr<SyncQuery> query_;
DISALLOW_COPY_AND_ASSIGN(Fence);
};
gpu::gles2::GLES2Interface* gl_;
unsigned query_id_;
base::WeakPtrFactory<SyncQuery> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(SyncQuery);
};
scoped_ptr<GLRenderer> GLRenderer::Create(
RendererClient* client,
const LayerTreeSettings* settings,
OutputSurface* output_surface,
ResourceProvider* resource_provider,
TextureMailboxDeleter* texture_mailbox_deleter,
int highp_threshold_min) {
return make_scoped_ptr(new GLRenderer(client,
settings,
output_surface,
resource_provider,
texture_mailbox_deleter,
highp_threshold_min));
}
GLRenderer::GLRenderer(RendererClient* client,
const LayerTreeSettings* settings,
OutputSurface* output_surface,
ResourceProvider* resource_provider,
TextureMailboxDeleter* texture_mailbox_deleter,
int highp_threshold_min)
: DirectRenderer(client, settings, output_surface, resource_provider),
offscreen_framebuffer_id_(0),
shared_geometry_quad_(QuadVertexRect()),
gl_(output_surface->context_provider()->ContextGL()),
context_support_(output_surface->context_provider()->ContextSupport()),
texture_mailbox_deleter_(texture_mailbox_deleter),
is_backbuffer_discarded_(false),
visible_(true),
is_scissor_enabled_(false),
scissor_rect_needs_reset_(true),
stencil_shadow_(false),
blend_shadow_(false),
highp_threshold_min_(highp_threshold_min),
highp_threshold_cache_(0),
use_sync_query_(false),
on_demand_tile_raster_resource_id_(0) {
DCHECK(gl_);
DCHECK(context_support_);
ContextProvider::Capabilities context_caps =
output_surface_->context_provider()->ContextCapabilities();
capabilities_.using_partial_swap =
settings_->partial_swap_enabled && context_caps.gpu.post_sub_buffer;
DCHECK(!context_caps.gpu.iosurface || context_caps.gpu.texture_rectangle);
capabilities_.using_egl_image = context_caps.gpu.egl_image_external;
capabilities_.max_texture_size = resource_provider_->max_texture_size();
capabilities_.best_texture_format = resource_provider_->best_texture_format();
// The updater can access textures while the GLRenderer is using them.
capabilities_.allow_partial_texture_updates = true;
// Check for texture fast paths. Currently we always use MO8 textures,
// so we only need to avoid POT textures if we have an NPOT fast-path.
capabilities_.avoid_pow2_textures = context_caps.gpu.fast_npot_mo8_textures;
capabilities_.using_map_image =
settings_->use_map_image && context_caps.gpu.map_image;
capabilities_.using_discard_framebuffer =
context_caps.gpu.discard_framebuffer;
capabilities_.allow_rasterize_on_demand = true;
use_sync_query_ = context_caps.gpu.sync_query;
InitializeSharedObjects();
}
GLRenderer::~GLRenderer() {
while (!pending_async_read_pixels_.empty()) {
PendingAsyncReadPixels* pending_read = pending_async_read_pixels_.back();
pending_read->finished_read_pixels_callback.Cancel();
pending_async_read_pixels_.pop_back();
}
in_use_overlay_resources_.clear();
CleanupSharedObjects();
}
const RendererCapabilitiesImpl& GLRenderer::Capabilities() const {
return capabilities_;
}
void GLRenderer::DebugGLCall(GLES2Interface* gl,
const char* command,
const char* file,
int line) {
GLuint error = gl->GetError();
if (error != GL_NO_ERROR)
LOG(ERROR) << "GL command failed: File: " << file << "\n\tLine " << line
<< "\n\tcommand: " << command << ", error "
<< static_cast<int>(error) << "\n";
}
void GLRenderer::SetVisible(bool visible) {
if (visible_ == visible)
return;
visible_ = visible;
EnforceMemoryPolicy();
context_support_->SetSurfaceVisible(visible);
}
void GLRenderer::SendManagedMemoryStats(size_t bytes_visible,
size_t bytes_visible_and_nearby,
size_t bytes_allocated) {
gpu::ManagedMemoryStats stats;
stats.bytes_required = bytes_visible;
stats.bytes_nice_to_have = bytes_visible_and_nearby;
stats.bytes_allocated = bytes_allocated;
stats.backbuffer_requested = !is_backbuffer_discarded_;
context_support_->SendManagedMemoryStats(stats);
}
void GLRenderer::ReleaseRenderPassTextures() { render_pass_textures_.clear(); }
void GLRenderer::DiscardPixels(bool has_external_stencil_test,
bool draw_rect_covers_full_surface) {
if (has_external_stencil_test || !draw_rect_covers_full_surface ||
!capabilities_.using_discard_framebuffer)
return;
bool using_default_framebuffer =
!current_framebuffer_lock_ &&
output_surface_->capabilities().uses_default_gl_framebuffer;
GLenum attachments[] = {static_cast<GLenum>(
using_default_framebuffer ? GL_COLOR_EXT : GL_COLOR_ATTACHMENT0_EXT)};
gl_->DiscardFramebufferEXT(
GL_FRAMEBUFFER, arraysize(attachments), attachments);
}
void GLRenderer::ClearFramebuffer(DrawingFrame* frame,
bool has_external_stencil_test) {
// It's unsafe to clear when we have a stencil test because glClear ignores
// stencil.
if (has_external_stencil_test) {
DCHECK(!frame->current_render_pass->has_transparent_background);
return;
}
// On DEBUG builds, opaque render passes are cleared to blue to easily see
// regions that were not drawn on the screen.
if (frame->current_render_pass->has_transparent_background)
GLC(gl_, gl_->ClearColor(0, 0, 0, 0));
else
GLC(gl_, gl_->ClearColor(0, 0, 1, 1));
bool always_clear = false;
#ifndef NDEBUG
always_clear = true;
#endif
if (always_clear || frame->current_render_pass->has_transparent_background) {
GLbitfield clear_bits = GL_COLOR_BUFFER_BIT;
if (always_clear)
clear_bits |= GL_STENCIL_BUFFER_BIT;
gl_->Clear(clear_bits);
}
}
void GLRenderer::BeginDrawingFrame(DrawingFrame* frame) {
if (frame->device_viewport_rect.IsEmpty())
return;
TRACE_EVENT0("cc", "GLRenderer::BeginDrawingFrame");
scoped_refptr<ResourceProvider::Fence> read_lock_fence;
if (use_sync_query_) {
while (!pending_sync_queries_.empty()) {
if (pending_sync_queries_.front()->IsPending())
break;
available_sync_queries_.push_back(pending_sync_queries_.take_front());
}
current_sync_query_ = available_sync_queries_.empty()
? make_scoped_ptr(new SyncQuery(gl_))
: available_sync_queries_.take_front();
read_lock_fence = current_sync_query_->Begin();
} else {
read_lock_fence = make_scoped_refptr(new FallbackFence(gl_));
}
resource_provider_->SetReadLockFence(read_lock_fence.get());
// TODO(enne): Do we need to reinitialize all of this state per frame?
ReinitializeGLState();
}
void GLRenderer::DoNoOp() {
GLC(gl_, gl_->BindFramebuffer(GL_FRAMEBUFFER, 0));
GLC(gl_, gl_->Flush());
}
void GLRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
DCHECK(quad->rect.Contains(quad->visible_rect));
if (quad->material != DrawQuad::TEXTURE_CONTENT) {
FlushTextureQuadCache();
}
switch (quad->material) {
case DrawQuad::INVALID:
NOTREACHED();
break;
case DrawQuad::CHECKERBOARD:
DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
break;
case DrawQuad::DEBUG_BORDER:
DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
break;
case DrawQuad::IO_SURFACE_CONTENT:
DrawIOSurfaceQuad(frame, IOSurfaceDrawQuad::MaterialCast(quad));
break;
case DrawQuad::PICTURE_CONTENT:
DrawPictureQuad(frame, PictureDrawQuad::MaterialCast(quad));
break;
case DrawQuad::RENDER_PASS:
DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
break;
case DrawQuad::SOLID_COLOR:
DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
break;
case DrawQuad::STREAM_VIDEO_CONTENT:
DrawStreamVideoQuad(frame, StreamVideoDrawQuad::MaterialCast(quad));
break;
case DrawQuad::SURFACE_CONTENT:
// Surface content should be fully resolved to other quad types before
// reaching a direct renderer.
NOTREACHED();
break;
case DrawQuad::TEXTURE_CONTENT:
EnqueueTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
break;
case DrawQuad::TILED_CONTENT:
DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
break;
case DrawQuad::YUV_VIDEO_CONTENT:
DrawYUVVideoQuad(frame, YUVVideoDrawQuad::MaterialCast(quad));
break;
}
}
void GLRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
const CheckerboardDrawQuad* quad) {
SetBlendEnabled(quad->ShouldDrawWithBlending());
const TileCheckerboardProgram* program = GetTileCheckerboardProgram();
DCHECK(program && (program->initialized() || IsContextLost()));
SetUseProgram(program->program());
SkColor color = quad->color;
GLC(gl_,
gl_->Uniform4f(program->fragment_shader().color_location(),
SkColorGetR(color) * (1.0f / 255.0f),
SkColorGetG(color) * (1.0f / 255.0f),
SkColorGetB(color) * (1.0f / 255.0f),
1));
const int checkerboard_width = 16;
float frequency = 1.0f / checkerboard_width;
gfx::Rect tile_rect = quad->rect;
float tex_offset_x = tile_rect.x() % checkerboard_width;
float tex_offset_y = tile_rect.y() % checkerboard_width;
float tex_scale_x = tile_rect.width();
float tex_scale_y = tile_rect.height();
GLC(gl_,
gl_->Uniform4f(program->fragment_shader().tex_transform_location(),
tex_offset_x,
tex_offset_y,
tex_scale_x,
tex_scale_y));
GLC(gl_,
gl_->Uniform1f(program->fragment_shader().frequency_location(),
frequency));
SetShaderOpacity(quad->opacity(),
program->fragment_shader().alpha_location());
DrawQuadGeometry(frame,
quad->quadTransform(),
quad->rect,
program->vertex_shader().matrix_location());
}
void GLRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
const DebugBorderDrawQuad* quad) {
SetBlendEnabled(quad->ShouldDrawWithBlending());
static float gl_matrix[16];
const DebugBorderProgram* program = GetDebugBorderProgram();
DCHECK(program && (program->initialized() || IsContextLost()));
SetUseProgram(program->program());
// Use the full quad_rect for debug quads to not move the edges based on
// partial swaps.
gfx::Rect layer_rect = quad->rect;
gfx::Transform render_matrix;
QuadRectTransform(&render_matrix, quad->quadTransform(), layer_rect);
GLRenderer::ToGLMatrix(&gl_matrix[0],
frame->projection_matrix * render_matrix);
GLC(gl_,
gl_->UniformMatrix4fv(
program->vertex_shader().matrix_location(), 1, false, &gl_matrix[0]));
SkColor color = quad->color;
float alpha = SkColorGetA(color) * (1.0f / 255.0f);
GLC(gl_,
gl_->Uniform4f(program->fragment_shader().color_location(),
(SkColorGetR(color) * (1.0f / 255.0f)) * alpha,
(SkColorGetG(color) * (1.0f / 255.0f)) * alpha,
(SkColorGetB(color) * (1.0f / 255.0f)) * alpha,
alpha));
GLC(gl_, gl_->LineWidth(quad->width));
// The indices for the line are stored in the same array as the triangle
// indices.
GLC(gl_, gl_->DrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, 0));
}
static SkBitmap ApplyImageFilter(
scoped_ptr<GLRenderer::ScopedUseGrContext> use_gr_context,
ResourceProvider* resource_provider,
const gfx::Point& origin,
SkImageFilter* filter,
ScopedResource* source_texture_resource) {
if (!filter)
return SkBitmap();
if (!use_gr_context)
return SkBitmap();
ResourceProvider::ScopedReadLockGL lock(resource_provider,
source_texture_resource->id());
// Wrap the source texture in a Ganesh platform texture.
GrBackendTextureDesc backend_texture_description;
backend_texture_description.fWidth = source_texture_resource->size().width();
backend_texture_description.fHeight =
source_texture_resource->size().height();
backend_texture_description.fConfig = kSkia8888_GrPixelConfig;
backend_texture_description.fTextureHandle = lock.texture_id();
backend_texture_description.fOrigin = kBottomLeft_GrSurfaceOrigin;
skia::RefPtr<GrTexture> texture =
skia::AdoptRef(use_gr_context->context()->wrapBackendTexture(
backend_texture_description));
SkImageInfo info = {
source_texture_resource->size().width(),
source_texture_resource->size().height(),
kPMColor_SkColorType,
kPremul_SkAlphaType
};
// Place the platform texture inside an SkBitmap.
SkBitmap source;
source.setConfig(info);
skia::RefPtr<SkGrPixelRef> pixel_ref =
skia::AdoptRef(new SkGrPixelRef(info, texture.get()));
source.setPixelRef(pixel_ref.get());
// Create a scratch texture for backing store.
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fSampleCnt = 0;
desc.fWidth = source.width();
desc.fHeight = source.height();
desc.fConfig = kSkia8888_GrPixelConfig;
desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
GrAutoScratchTexture scratch_texture(
use_gr_context->context(), desc, GrContext::kExact_ScratchTexMatch);
skia::RefPtr<GrTexture> backing_store =
skia::AdoptRef(scratch_texture.detach());
// Create a device and canvas using that backing store.
SkGpuDevice device(use_gr_context->context(), backing_store.get());
SkCanvas canvas(&device);
// Draw the source bitmap through the filter to the canvas.
SkPaint paint;
paint.setImageFilter(filter);
canvas.clear(SK_ColorTRANSPARENT);
// TODO(senorblanco): in addition to the origin translation here, the canvas
// should also be scaled to accomodate device pixel ratio and pinch zoom. See
// crbug.com/281516 and crbug.com/281518.
canvas.translate(SkIntToScalar(-origin.x()), SkIntToScalar(-origin.y()));
canvas.drawSprite(source, 0, 0, &paint);
// Flush the GrContext to ensure all buffered GL calls are drawn to the
// backing store before we access and return it, and have cc begin using the
// GL context again.
use_gr_context->context()->flush();
return device.accessBitmap(false);
}
static SkBitmap ApplyBlendModeWithBackdrop(
scoped_ptr<GLRenderer::ScopedUseGrContext> use_gr_context,
ResourceProvider* resource_provider,
SkBitmap source_bitmap_with_filters,
ScopedResource* source_texture_resource,
ScopedResource* background_texture_resource,
SkXfermode::Mode blend_mode) {
if (!use_gr_context)
return source_bitmap_with_filters;
DCHECK(background_texture_resource);
DCHECK(source_texture_resource);
gfx::Size source_size = source_texture_resource->size();
gfx::Size background_size = background_texture_resource->size();
DCHECK_LE(background_size.width(), source_size.width());
DCHECK_LE(background_size.height(), source_size.height());
int source_texture_with_filters_id;
scoped_ptr<ResourceProvider::ScopedReadLockGL> lock;
if (source_bitmap_with_filters.getTexture()) {
DCHECK_EQ(source_size.width(), source_bitmap_with_filters.width());
DCHECK_EQ(source_size.height(), source_bitmap_with_filters.height());
GrTexture* texture =
reinterpret_cast<GrTexture*>(source_bitmap_with_filters.getTexture());
source_texture_with_filters_id = texture->getTextureHandle();
} else {
lock.reset(new ResourceProvider::ScopedReadLockGL(
resource_provider, source_texture_resource->id()));
source_texture_with_filters_id = lock->texture_id();
}
ResourceProvider::ScopedReadLockGL lock_background(
resource_provider, background_texture_resource->id());
// Wrap the source texture in a Ganesh platform texture.
GrBackendTextureDesc backend_texture_description;
backend_texture_description.fConfig = kSkia8888_GrPixelConfig;
backend_texture_description.fOrigin = kBottomLeft_GrSurfaceOrigin;
backend_texture_description.fWidth = source_size.width();
backend_texture_description.fHeight = source_size.height();
backend_texture_description.fTextureHandle = source_texture_with_filters_id;
skia::RefPtr<GrTexture> source_texture =
skia::AdoptRef(use_gr_context->context()->wrapBackendTexture(
backend_texture_description));
backend_texture_description.fWidth = background_size.width();
backend_texture_description.fHeight = background_size.height();
backend_texture_description.fTextureHandle = lock_background.texture_id();
skia::RefPtr<GrTexture> background_texture =
skia::AdoptRef(use_gr_context->context()->wrapBackendTexture(
backend_texture_description));
SkImageInfo source_info = {
source_size.width(),
source_size.height(),
kPMColor_SkColorType,
kPremul_SkAlphaType
};
// Place the platform texture inside an SkBitmap.
SkBitmap source;
source.setConfig(source_info);
skia::RefPtr<SkGrPixelRef> source_pixel_ref =
skia::AdoptRef(new SkGrPixelRef(source_info, source_texture.get()));
source.setPixelRef(source_pixel_ref.get());
SkImageInfo background_info = {
background_size.width(),
background_size.height(),
kPMColor_SkColorType,
kPremul_SkAlphaType
};
SkBitmap background;
background.setConfig(background_info);
skia::RefPtr<SkGrPixelRef> background_pixel_ref =
skia::AdoptRef(new SkGrPixelRef(
background_info, background_texture.get()));
background.setPixelRef(background_pixel_ref.get());
// Create a scratch texture for backing store.
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fSampleCnt = 0;
desc.fWidth = source.width();
desc.fHeight = source.height();
desc.fConfig = kSkia8888_GrPixelConfig;
desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
GrAutoScratchTexture scratch_texture(
use_gr_context->context(), desc, GrContext::kExact_ScratchTexMatch);
skia::RefPtr<GrTexture> backing_store =
skia::AdoptRef(scratch_texture.detach());
// Create a device and canvas using that backing store.
SkGpuDevice device(use_gr_context->context(), backing_store.get());
SkCanvas canvas(&device);
// Draw the source bitmap through the filter to the canvas.
canvas.clear(SK_ColorTRANSPARENT);
canvas.drawSprite(background, 0, 0);
SkPaint paint;
paint.setXfermodeMode(blend_mode);
canvas.drawSprite(source, 0, 0, &paint);
// Flush the GrContext to ensure all buffered GL calls are drawn to the
// backing store before we access and return it, and have cc begin using the
// GL context again.
use_gr_context->context()->flush();
return device.accessBitmap(false);
}
scoped_ptr<ScopedResource> GLRenderer::GetBackgroundWithFilters(
DrawingFrame* frame,
const RenderPassDrawQuad* quad,
const gfx::Transform& contents_device_transform,
const gfx::Transform& contents_device_transform_inverse,
bool* background_changed) {
// This method draws a background filter, which applies a filter to any pixels
// behind the quad and seen through its background. The algorithm works as
// follows:
// 1. Compute a bounding box around the pixels that will be visible through
// the quad.
// 2. Read the pixels in the bounding box into a buffer R.
// 3. Apply the background filter to R, so that it is applied in the pixels'
// coordinate space.
// 4. Apply the quad's inverse transform to map the pixels in R into the
// quad's content space. This implicitly clips R by the content bounds of the
// quad since the destination texture has bounds matching the quad's content.
// 5. Draw the background texture for the contents using the same transform as
// used to draw the contents itself. This is done without blending to replace
// the current background pixels with the new filtered background.
// 6. Draw the contents of the quad over drop of the new background with
// blending, as per usual. The filtered background pixels will show through
// any non-opaque pixels in this draws.
//
// Pixel copies in this algorithm occur at steps 2, 3, 4, and 5.
// TODO(danakj): When this algorithm changes, update
// LayerTreeHost::PrioritizeTextures() accordingly.
// TODO(danakj): We only allow background filters on an opaque render surface
// because other surfaces may contain translucent pixels, and the contents
// behind those translucent pixels wouldn't have the filter applied.
bool apply_background_filters =
!frame->current_render_pass->has_transparent_background;
DCHECK(!frame->current_texture);
// TODO(ajuma): Add support for reference filters once
// FilterOperations::GetOutsets supports reference filters.
if (apply_background_filters && quad->background_filters.HasReferenceFilter())
apply_background_filters = false;
// TODO(danakj): Do a single readback for both the surface and replica and
// cache the filtered results (once filter textures are not reused).
gfx::Rect window_rect = gfx::ToEnclosingRect(MathUtil::MapClippedRect(
contents_device_transform, SharedGeometryQuad().BoundingBox()));
int top, right, bottom, left;
quad->background_filters.GetOutsets(&top, &right, &bottom, &left);
window_rect.Inset(-left, -top, -right, -bottom);
window_rect.Intersect(
MoveFromDrawToWindowSpace(frame->current_render_pass->output_rect));
scoped_ptr<ScopedResource> device_background_texture =
ScopedResource::Create(resource_provider_);
// The TextureUsageFramebuffer hint makes ResourceProvider avoid immutable
// storage allocation (texStorage2DEXT) for this texture. copyTexImage2D fails
// when called on a texture having immutable storage.
device_background_texture->Allocate(
window_rect.size(), ResourceProvider::TextureUsageFramebuffer, RGBA_8888);
{
ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
device_background_texture->id());
GetFramebufferTexture(
lock.texture_id(), device_background_texture->format(), window_rect);
}
skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
quad->background_filters, device_background_texture->size());
SkBitmap filtered_device_background;
if (apply_background_filters) {
filtered_device_background =
ApplyImageFilter(ScopedUseGrContext::Create(this, frame),
resource_provider_,
quad->rect.origin(),
filter.get(),
device_background_texture.get());
}
*background_changed = (filtered_device_background.getTexture() != NULL);
int filtered_device_background_texture_id = 0;
scoped_ptr<ResourceProvider::ScopedReadLockGL> lock;
if (filtered_device_background.getTexture()) {
GrTexture* texture =
reinterpret_cast<GrTexture*>(filtered_device_background.getTexture());
filtered_device_background_texture_id = texture->getTextureHandle();
} else {
lock.reset(new ResourceProvider::ScopedReadLockGL(
resource_provider_, device_background_texture->id()));
filtered_device_background_texture_id = lock->texture_id();
}
scoped_ptr<ScopedResource> background_texture =
ScopedResource::Create(resource_provider_);
background_texture->Allocate(
quad->rect.size(), ResourceProvider::TextureUsageFramebuffer, RGBA_8888);
const RenderPass* target_render_pass = frame->current_render_pass;
bool using_background_texture =
UseScopedTexture(frame, background_texture.get(), quad->rect);
if (using_background_texture) {
// Copy the readback pixels from device to the background texture for the
// surface.
gfx::Transform device_to_framebuffer_transform;
QuadRectTransform(
&device_to_framebuffer_transform, gfx::Transform(), quad->rect);
device_to_framebuffer_transform.PreconcatTransform(
contents_device_transform_inverse);
#ifndef NDEBUG
GLC(gl_, gl_->ClearColor(0, 0, 1, 1));
gl_->Clear(GL_COLOR_BUFFER_BIT);
#endif
// The filtered_deveice_background_texture is oriented the same as the frame
// buffer. The transform we are copying with has a vertical flip, as well as
// the |device_to_framebuffer_transform|, which cancel each other out. So do
// not flip the contents in the shader to maintain orientation.
bool flip_vertically = false;
CopyTextureToFramebuffer(frame,
filtered_device_background_texture_id,
window_rect,
device_to_framebuffer_transform,
flip_vertically);
}
UseRenderPass(frame, target_render_pass);
if (!using_background_texture)
return scoped_ptr<ScopedResource>();
return background_texture.Pass();
}
void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
const RenderPassDrawQuad* quad) {
SetBlendEnabled(quad->ShouldDrawWithBlending());
ScopedResource* contents_texture =
render_pass_textures_.get(quad->render_pass_id);
if (!contents_texture || !contents_texture->id())
return;
gfx::Transform quad_rect_matrix;
QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
gfx::Transform contents_device_transform =
frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
contents_device_transform.FlattenTo2d();
// Can only draw surface if device matrix is invertible.
gfx::Transform contents_device_transform_inverse(
gfx::Transform::kSkipInitialization);
if (!contents_device_transform.GetInverse(&contents_device_transform_inverse))
return;
bool need_background_texture =
quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode ||
!quad->background_filters.IsEmpty();
bool background_changed = false;
scoped_ptr<ScopedResource> background_texture;
if (need_background_texture) {
// The pixels from the filtered background should completely replace the
// current pixel values.
bool disable_blending = blend_enabled();
if (disable_blending)
SetBlendEnabled(false);
background_texture =
GetBackgroundWithFilters(frame,
quad,
contents_device_transform,
contents_device_transform_inverse,
&background_changed);
if (disable_blending)
SetBlendEnabled(true);
}
// TODO(senorblanco): Cache this value so that we don't have to do it for both
// the surface and its replica. Apply filters to the contents texture.
SkBitmap filter_bitmap;
SkScalar color_matrix[20];
bool use_color_matrix = false;
if (!quad->filters.IsEmpty()) {
skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
quad->filters, contents_texture->size());
if (filter) {
skia::RefPtr<SkColorFilter> cf;
{
SkColorFilter* colorfilter_rawptr = NULL;
filter->asColorFilter(&colorfilter_rawptr);
cf = skia::AdoptRef(colorfilter_rawptr);
}
if (cf && cf->asColorMatrix(color_matrix) && !filter->getInput(0)) {
// We have a single color matrix as a filter; apply it locally
// in the compositor.
use_color_matrix = true;
} else {
filter_bitmap =
ApplyImageFilter(ScopedUseGrContext::Create(this, frame),
resource_provider_,
quad->rect.origin(),
filter.get(),