| // Copyright 2017 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 "cobalt/renderer/rasterizer/egl/render_tree_node_visitor.h" |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <limits> |
| |
| #include "base/debug/trace_event.h" |
| #include "base/logging.h" |
| #include "base/optional.h" |
| #include "cobalt/base/polymorphic_downcast.h" |
| #include "cobalt/base/type_id.h" |
| #include "cobalt/math/matrix3_f.h" |
| #include "cobalt/math/transform_2d.h" |
| #include "cobalt/renderer/rasterizer/common/utils.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_callback.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_clear.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_poly_color.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_rect_color_texture.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_rect_linear_gradient.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_rect_shadow_blur.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_rect_shadow_spread.h" |
| #include "cobalt/renderer/rasterizer/egl/draw_rect_texture.h" |
| #include "cobalt/renderer/rasterizer/skia/hardware_image.h" |
| #include "cobalt/renderer/rasterizer/skia/image.h" |
| |
| namespace cobalt { |
| namespace renderer { |
| namespace rasterizer { |
| namespace egl { |
| |
| namespace { |
| |
| const render_tree::ColorRGBA kOpaqueWhite(1.0f, 1.0f, 1.0f, 1.0f); |
| const render_tree::ColorRGBA kTransparentBlack(0.0f, 0.0f, 0.0f, 0.0f); |
| |
| math::Rect RoundRectFToInt(const math::RectF& input) { |
| int left = static_cast<int>(input.x() + 0.5f); |
| int right = static_cast<int>(input.right() + 0.5f); |
| int top = static_cast<int>(input.y() + 0.5f); |
| int bottom = static_cast<int>(input.bottom() + 0.5f); |
| return math::Rect(left, top, right - left, bottom - top); |
| } |
| |
| bool IsOnlyScaleAndTranslate(const math::Matrix3F& matrix) { |
| return matrix(2, 0) == 0 && matrix(2, 1) == 0 && matrix(2, 2) == 1 && |
| matrix(0, 1) == 0 && matrix(1, 0) == 0; |
| } |
| |
| math::Matrix3F GetTexcoordTransform( |
| const OffscreenTargetManager::TargetInfo& target) { |
| // Flip the texture vertically to accommodate OpenGL's bottom-left origin. |
| float scale_x = 1.0f / target.framebuffer->GetSize().width(); |
| float scale_y = -1.0f / target.framebuffer->GetSize().height(); |
| return math::Matrix3F::FromValues( |
| target.region.width() * scale_x, 0, target.region.x() * scale_x, |
| 0, target.region.height() * scale_y, 1.0f + target.region.y() * scale_y, |
| 0, 0, 1); |
| } |
| |
| } // namespace |
| |
| RenderTreeNodeVisitor::RenderTreeNodeVisitor(GraphicsState* graphics_state, |
| DrawObjectManager* draw_object_manager, |
| OffscreenTargetManager* offscreen_target_manager, |
| const FallbackRasterizeFunction& fallback_rasterize, |
| SkCanvas* fallback_render_target, |
| backend::RenderTarget* render_target, |
| const math::Rect& content_rect) |
| : graphics_state_(graphics_state), |
| draw_object_manager_(draw_object_manager), |
| offscreen_target_manager_(offscreen_target_manager), |
| fallback_rasterize_(fallback_rasterize), |
| fallback_render_target_(fallback_render_target), |
| render_target_(render_target), |
| render_target_is_offscreen_(false), |
| allow_offscreen_targets_(true), |
| failed_offscreen_target_request_(false), |
| last_draw_id_(0) { |
| draw_state_.scissor.Intersect(content_rect); |
| } |
| |
| void RenderTreeNodeVisitor::Visit( |
| render_tree::CompositionNode* composition_node) { |
| const render_tree::CompositionNode::Builder& data = composition_node->data(); |
| math::Matrix3F old_transform = draw_state_.transform; |
| draw_state_.transform = draw_state_.transform * |
| math::TranslateMatrix(data.offset().x(), data.offset().y()); |
| const render_tree::CompositionNode::Children& children = |
| data.children(); |
| for (render_tree::CompositionNode::Children::const_iterator iter = |
| children.begin(); iter != children.end(); ++iter) { |
| (*iter)->Accept(this); |
| } |
| draw_state_.transform = old_transform; |
| } |
| |
| void RenderTreeNodeVisitor::Visit( |
| render_tree::MatrixTransform3DNode* transform_3d_node) { |
| // This is used in conjunction with a map-to-mesh filter. If that filter is |
| // implemented natively, then this transform 3D must be handled natively |
| // as well. Otherwise, use the fallback rasterizer for both. |
| FallbackRasterize(transform_3d_node); |
| } |
| |
| void RenderTreeNodeVisitor::Visit( |
| render_tree::MatrixTransformNode* transform_node) { |
| const render_tree::MatrixTransformNode::Builder& data = |
| transform_node->data(); |
| math::Matrix3F old_transform = draw_state_.transform; |
| draw_state_.transform = draw_state_.transform * |
| data.transform; |
| data.source->Accept(this); |
| draw_state_.transform = old_transform; |
| } |
| |
| void RenderTreeNodeVisitor::Visit(render_tree::FilterNode* filter_node) { |
| const render_tree::FilterNode::Builder& data = filter_node->data(); |
| |
| // If this is only a viewport filter w/o rounded edges, and the current |
| // transform matrix keeps the filter as an orthogonal rect, then collapse |
| // the node. |
| if (data.viewport_filter && |
| !data.viewport_filter->has_rounded_corners() && |
| !data.opacity_filter && |
| !data.blur_filter && |
| !data.map_to_mesh_filter) { |
| const math::Matrix3F& transform = draw_state_.transform; |
| if (IsOnlyScaleAndTranslate(transform)) { |
| // Transform local viewport to world viewport. |
| const math::RectF& filter_viewport = data.viewport_filter->viewport(); |
| math::RectF transformed_viewport( |
| filter_viewport.x() * transform(0, 0) + transform(0, 2), |
| filter_viewport.y() * transform(1, 1) + transform(1, 2), |
| filter_viewport.width() * transform(0, 0), |
| filter_viewport.height() * transform(1, 1)); |
| // Ensure transformed viewport data is sane (in case global transform |
| // flipped any axis). |
| if (transformed_viewport.width() < 0) { |
| transformed_viewport.set_x(transformed_viewport.right()); |
| transformed_viewport.set_width(-transformed_viewport.width()); |
| } |
| if (transformed_viewport.height() < 0) { |
| transformed_viewport.set_y(transformed_viewport.bottom()); |
| transformed_viewport.set_height(-transformed_viewport.height()); |
| } |
| // Combine the new viewport filter with existing viewport filter. |
| math::Rect old_scissor = draw_state_.scissor; |
| draw_state_.scissor.Intersect(RoundRectFToInt(transformed_viewport)); |
| if (!draw_state_.scissor.IsEmpty()) { |
| data.source->Accept(this); |
| } |
| draw_state_.scissor = old_scissor; |
| return; |
| } |
| } |
| |
| // Handle opacity-only filter. |
| if (data.opacity_filter && |
| !data.viewport_filter && |
| !data.blur_filter && |
| !data.map_to_mesh_filter) { |
| const float filter_opacity = data.opacity_filter->opacity(); |
| if (filter_opacity <= 0.0f) { |
| // Totally transparent. Ignore the source. |
| return; |
| } else if (filter_opacity >= 1.0f) { |
| // Totally opaque. Render like normal. |
| data.source->Accept(this); |
| return; |
| } else if (common::utils::NodeCanRenderWithOpacity(data.source)) { |
| // Simple opacity that does not require an offscreen target. |
| float old_opacity = draw_state_.opacity; |
| draw_state_.opacity *= filter_opacity; |
| data.source->Accept(this); |
| draw_state_.opacity = old_opacity; |
| return; |
| } else { |
| // Complex opacity that requires an offscreen target. |
| math::Matrix3F texcoord_transform(math::Matrix3F::Identity()); |
| math::RectF content_rect; |
| const backend::TextureEGL* texture = nullptr; |
| |
| // Render source at 100% opacity to an offscreen target, then render |
| // that result with the specified filter opacity. |
| OffscreenRasterize(data.source, &texture, &texcoord_transform, |
| &content_rect); |
| if (texture != nullptr) { |
| if (content_rect.IsEmpty()) { |
| return; |
| } |
| |
| // The content rect is already in screen space, so reset the transform. |
| math::Matrix3F old_transform = draw_state_.transform; |
| draw_state_.transform = math::Matrix3F::Identity(); |
| scoped_ptr<DrawObject> draw(new DrawRectColorTexture(graphics_state_, |
| draw_state_, content_rect, kOpaqueWhite * filter_opacity, texture, |
| texcoord_transform, false /* clamp_texcoords */)); |
| AddTransparentDraw(draw.Pass(), content_rect); |
| draw_state_.transform = old_transform; |
| return; |
| } |
| } |
| } |
| |
| // Handle blur-only filter. |
| if (data.blur_filter && |
| !data.viewport_filter && |
| !data.opacity_filter && |
| !data.map_to_mesh_filter) { |
| if (data.blur_filter->blur_sigma() == 0.0f) { |
| // Ignorable blur request. Render normally. |
| data.source->Accept(this); |
| return; |
| } |
| } |
| |
| // No filter. |
| if (!data.opacity_filter && |
| !data.viewport_filter && |
| !data.blur_filter && |
| !data.map_to_mesh_filter) { |
| data.source->Accept(this); |
| return; |
| } |
| |
| // Use the fallback rasterizer to handle everything else. |
| FallbackRasterize(filter_node); |
| } |
| |
| void RenderTreeNodeVisitor::Visit(render_tree::ImageNode* image_node) { |
| const render_tree::ImageNode::Builder& data = image_node->data(); |
| |
| // The image node may contain nothing. For example, when it represents a video |
| // element before any frame is decoded. |
| if (!data.source) { |
| return; |
| } |
| |
| if (!IsVisible(image_node->GetBounds())) { |
| return; |
| } |
| |
| skia::Image* skia_image = |
| base::polymorphic_downcast<skia::Image*>(data.source.get()); |
| bool clamp_texcoords = false; |
| bool is_opaque = skia_image->IsOpaque() && draw_state_.opacity == 1.0f; |
| |
| // Ensure any required backend processing is done to create the necessary |
| // GPU resource. |
| skia_image->EnsureInitialized(); |
| |
| // Calculate matrix to transform texture coordinates according to the local |
| // transform. |
| math::Matrix3F texcoord_transform(math::Matrix3F::Identity()); |
| if (IsOnlyScaleAndTranslate(data.local_transform)) { |
| texcoord_transform(0, 0) = data.local_transform(0, 0) != 0 ? |
| 1.0f / data.local_transform(0, 0) : 0; |
| texcoord_transform(1, 1) = data.local_transform(1, 1) != 0 ? |
| 1.0f / data.local_transform(1, 1) : 0; |
| texcoord_transform(0, 2) = -texcoord_transform(0, 0) * |
| data.local_transform(0, 2); |
| texcoord_transform(1, 2) = -texcoord_transform(1, 1) * |
| data.local_transform(1, 2); |
| if (texcoord_transform(0, 0) < 1.0f || texcoord_transform(1, 1) < 1.0f) { |
| // Edges may interpolate with texels outside the designated region. |
| // Use a fragment shader that clamps the texture coordinates to prevent |
| // that from happening. |
| clamp_texcoords = true; |
| } |
| } else { |
| texcoord_transform = data.local_transform.Inverse(); |
| } |
| |
| // Different shaders are used depending on whether the image has a single |
| // plane or multiple planes. |
| scoped_ptr<DrawObject> draw; |
| |
| if (skia_image->GetTypeId() == base::GetTypeId<skia::SinglePlaneImage>()) { |
| skia::HardwareFrontendImage* hardware_image = |
| base::polymorphic_downcast<skia::HardwareFrontendImage*>(skia_image); |
| if (hardware_image->alternate_rgba_format()) { |
| // We don't yet handle alternative formats that piggyback on a GL_RGBA |
| // texture. This comes up, for example, with UYVY (YUV 422) textures. |
| FallbackRasterize(image_node); |
| return; |
| } |
| |
| if (clamp_texcoords || !is_opaque) { |
| draw.reset(new DrawRectColorTexture(graphics_state_, draw_state_, |
| data.destination_rect, kOpaqueWhite, |
| hardware_image->GetTextureEGL(), texcoord_transform, |
| clamp_texcoords)); |
| } else { |
| draw.reset(new DrawRectTexture(graphics_state_, draw_state_, |
| data.destination_rect, hardware_image->GetTextureEGL(), |
| texcoord_transform)); |
| } |
| } else if (skia_image->GetTypeId() == |
| base::GetTypeId<skia::MultiPlaneImage>()) { |
| FallbackRasterize(image_node); |
| return; |
| } else { |
| NOTREACHED(); |
| return; |
| } |
| |
| if (is_opaque) { |
| AddOpaqueDraw(draw.Pass(), image_node->GetBounds()); |
| } else { |
| AddTransparentDraw(draw.Pass(), image_node->GetBounds()); |
| } |
| } |
| |
| void RenderTreeNodeVisitor::Visit( |
| render_tree::PunchThroughVideoNode* video_node) { |
| if (!IsVisible(video_node->GetBounds())) { |
| return; |
| } |
| |
| const render_tree::PunchThroughVideoNode::Builder& data = video_node->data(); |
| math::RectF mapped_rect = draw_state_.transform.MapRect(data.rect); |
| data.set_bounds_cb.Run( |
| math::Rect(static_cast<int>(mapped_rect.x()), |
| static_cast<int>(mapped_rect.y()), |
| static_cast<int>(mapped_rect.width()), |
| static_cast<int>(mapped_rect.height()))); |
| |
| scoped_ptr<DrawObject> draw(new DrawPolyColor(graphics_state_, |
| draw_state_, data.rect, kTransparentBlack)); |
| AddOpaqueDraw(draw.Pass(), video_node->GetBounds()); |
| } |
| |
| void RenderTreeNodeVisitor::Visit(render_tree::RectNode* rect_node) { |
| if (!IsVisible(rect_node->GetBounds())) { |
| return; |
| } |
| |
| const render_tree::RectNode::Builder& data = rect_node->data(); |
| const scoped_ptr<render_tree::Brush>& brush = data.background_brush; |
| |
| // Only solid color brushes are supported at this time. |
| const bool brush_supported = !brush || |
| brush->GetTypeId() == base::GetTypeId<render_tree::SolidColorBrush>() || |
| brush->GetTypeId() == base::GetTypeId<render_tree::LinearGradientBrush>(); |
| |
| // Borders are not supported natively by this rasterizer at this time. The |
| // difficulty lies in getting anti-aliased borders and minimizing state |
| // switches (due to anti-aliased borders requiring transparency). However, |
| // by using the fallback rasterizer, both can be accomplished -- sort to |
| // minimize state switches while rendering anti-aliased borders to the |
| // offscreen target, then use a single shader to render those. |
| const bool border_supported = !data.border; |
| |
| if (data.rounded_corners) { |
| FallbackRasterize(rect_node); |
| } else if (!brush_supported) { |
| FallbackRasterize(rect_node); |
| } else if (!border_supported) { |
| FallbackRasterize(rect_node); |
| } else { |
| DCHECK(!data.border); |
| const math::RectF& content_rect(data.rect); |
| |
| // Handle drawing the content. |
| if (brush) { |
| base::TypeId brush_type = brush->GetTypeId(); |
| if (brush_type == base::GetTypeId<render_tree::SolidColorBrush>()) { |
| const render_tree::SolidColorBrush* solid_brush = |
| base::polymorphic_downcast<const render_tree::SolidColorBrush*> |
| (brush.get()); |
| const render_tree::ColorRGBA& brush_color(solid_brush->color()); |
| render_tree::ColorRGBA content_color( |
| brush_color.r() * brush_color.a(), |
| brush_color.g() * brush_color.a(), |
| brush_color.b() * brush_color.a(), |
| brush_color.a()); |
| scoped_ptr<DrawObject> draw(new DrawPolyColor(graphics_state_, |
| draw_state_, content_rect, content_color)); |
| if (draw_state_.opacity * content_color.a() == 1.0f) { |
| AddOpaqueDraw(draw.Pass(), rect_node->GetBounds()); |
| } else { |
| AddTransparentDraw(draw.Pass(), rect_node->GetBounds()); |
| } |
| } else { |
| const render_tree::LinearGradientBrush* linear_brush = |
| base::polymorphic_downcast<const render_tree::LinearGradientBrush*> |
| (brush.get()); |
| scoped_ptr<DrawObject> draw(new DrawRectLinearGradient(graphics_state_, |
| draw_state_, content_rect, *linear_brush)); |
| // The draw may use transparent pixels to ensure only pixels in the |
| // content_rect are modified. |
| AddTransparentDraw(draw.Pass(), rect_node->GetBounds()); |
| } |
| } |
| } |
| } |
| |
| void RenderTreeNodeVisitor::Visit(render_tree::RectShadowNode* shadow_node) { |
| math::RectF node_bounds(shadow_node->GetBounds()); |
| if (!IsVisible(node_bounds)) { |
| return; |
| } |
| |
| const render_tree::RectShadowNode::Builder& data = shadow_node->data(); |
| base::optional<render_tree::RoundedCorners> spread_corners = |
| data.rounded_corners; |
| |
| scoped_ptr<DrawObject> draw; |
| render_tree::ColorRGBA shadow_color( |
| data.shadow.color.r() * data.shadow.color.a(), |
| data.shadow.color.g() * data.shadow.color.a(), |
| data.shadow.color.b() * data.shadow.color.a(), |
| data.shadow.color.a()); |
| |
| math::RectF spread_rect(data.rect); |
| spread_rect.Offset(data.shadow.offset); |
| if (data.inset) { |
| if (spread_corners) { |
| spread_corners = spread_corners->Inset( |
| data.spread, data.spread, data.spread, data.spread); |
| } |
| spread_rect.Inset(data.spread, data.spread); |
| if (!spread_rect.IsEmpty() && data.shadow.blur_sigma > 0.0f) { |
| draw.reset(new DrawRectShadowBlur(graphics_state_, draw_state_, |
| data.rect, data.rounded_corners, spread_rect, spread_corners, |
| shadow_color, data.shadow.blur_sigma, data.inset)); |
| } else { |
| draw.reset(new DrawRectShadowSpread(graphics_state_, draw_state_, |
| spread_rect, spread_corners, data.rect, data.rounded_corners, |
| shadow_color)); |
| } |
| } else { |
| if (spread_corners) { |
| spread_corners = spread_corners->Inset( |
| -data.spread, -data.spread, -data.spread, -data.spread); |
| } |
| spread_rect.Outset(data.spread, data.spread); |
| if (spread_rect.IsEmpty()) { |
| // Negative spread shenanigans! Nothing to draw. |
| return; |
| } |
| if (data.shadow.blur_sigma > 0.0f) { |
| draw.reset(new DrawRectShadowBlur(graphics_state_, draw_state_, |
| data.rect, data.rounded_corners, spread_rect, spread_corners, |
| shadow_color, data.shadow.blur_sigma, data.inset)); |
| } else { |
| draw.reset(new DrawRectShadowSpread(graphics_state_, draw_state_, |
| data.rect, data.rounded_corners, spread_rect, spread_corners, |
| shadow_color)); |
| } |
| } |
| |
| // Transparency is used to skip pixels that are not shadowed. |
| AddTransparentDraw(draw.Pass(), node_bounds); |
| } |
| |
| void RenderTreeNodeVisitor::Visit(render_tree::TextNode* text_node) { |
| if (!IsVisible(text_node->GetBounds())) { |
| return; |
| } |
| |
| FallbackRasterize(text_node); |
| } |
| |
| // Get an offscreen target to render |node|. |
| // |out_content_cached| is true if the node's contents are already cached in |
| // the returned offscreen target. |
| // |out_target_info| describes the offscreen surface into which |node| should |
| // be rendered. |
| // |out_content_rect| is the onscreen rect (already in screen space) where the |
| // offscreen contents should be rendered. |
| void RenderTreeNodeVisitor::GetOffscreenTarget( |
| scoped_refptr<render_tree::Node> node, |
| bool* out_content_cached, |
| OffscreenTargetManager::TargetInfo* out_target_info, |
| math::RectF* out_content_rect) { |
| // Default to telling the caller that nothing should be rendered. |
| *out_content_cached = true; |
| out_content_rect->SetRect(0, 0, 0, 0); |
| |
| if (!allow_offscreen_targets_) { |
| failed_offscreen_target_request_ = true; |
| return; |
| } |
| |
| math::RectF node_bounds(node->GetBounds()); |
| math::RectF mapped_bounds(draw_state_.transform.MapRect(node_bounds)); |
| if (mapped_bounds.IsEmpty()) { |
| return; |
| } |
| |
| // Request a slightly larger render target than the calculated bounds. The |
| // rasterizer may use an extra pixel along the edge of anti-aliased objects. |
| const float kBorderWidth = 1.0f; |
| |
| // The render target cache keys off the render_tree Node and target size. |
| // Since the size is rounded, it is possible to be a fraction of a pixel |
| // off. However, this in turn allows for a cache hit for "close-enough" |
| // renderings. To minimize offset errors, use the nearest full pixel offset. |
| const float kFractionPad = 1.0f; |
| float offset_x = std::floor(mapped_bounds.x() + 0.5f); |
| float offset_y = std::floor(mapped_bounds.y() + 0.5f); |
| math::PointF content_offset( |
| offset_x - kBorderWidth - kFractionPad, |
| offset_y - kBorderWidth - kFractionPad); |
| math::SizeF content_size( |
| std::ceil(mapped_bounds.width() + 2.0f * kBorderWidth + kFractionPad), |
| std::ceil(mapped_bounds.height() + 2.0f * kBorderWidth + kFractionPad)); |
| *out_content_cached = offscreen_target_manager_->GetCachedOffscreenTarget( |
| node, content_size, out_target_info); |
| if (!(*out_content_cached)) { |
| offscreen_target_manager_->AllocateOffscreenTarget(node, |
| content_size, out_target_info); |
| } |
| |
| // If no offscreen target was available, then set the content_rect as if |
| // rendering will occur on the current render target. |
| if (out_target_info->framebuffer == nullptr) { |
| mapped_bounds.Outset(kBorderWidth, kBorderWidth); |
| mapped_bounds.Intersect(draw_state_.scissor); |
| if (mapped_bounds.IsEmpty()) { |
| return; |
| } |
| float left = std::floor(mapped_bounds.x()); |
| float right = std::ceil(mapped_bounds.right()); |
| float top = std::floor(mapped_bounds.y()); |
| float bottom = std::ceil(mapped_bounds.bottom()); |
| content_offset.SetPoint(left, top); |
| content_size.SetSize(right - left, bottom - top); |
| } else { |
| DCHECK_LE(content_size.width(), out_target_info->region.width()); |
| DCHECK_LE(content_size.height(), out_target_info->region.height()); |
| } |
| |
| out_target_info->region.set_size(content_size); |
| |
| out_content_rect->set_origin(content_offset); |
| out_content_rect->set_size(content_size); |
| } |
| |
| void RenderTreeNodeVisitor::FallbackRasterize( |
| scoped_refptr<render_tree::Node> node) { |
| OffscreenTargetManager::TargetInfo target_info; |
| math::RectF content_rect; |
| bool content_is_cached = false; |
| GetOffscreenTarget(node, &content_is_cached, &target_info, &content_rect); |
| |
| if (content_rect.IsEmpty()) { |
| return; |
| } |
| |
| // If no offscreen target was available, then just render directly onto the |
| // current render target. |
| if (target_info.framebuffer == nullptr) { |
| base::Closure rasterize_callback = base::Bind(fallback_rasterize_, |
| node, fallback_render_target_, draw_state_.transform, content_rect, |
| draw_state_.opacity, kFallbackShouldFlush); |
| scoped_ptr<DrawObject> draw(new DrawCallback(rasterize_callback)); |
| AddExternalDraw(draw.Pass(), content_rect, node->GetTypeId()); |
| return; |
| } |
| |
| // Setup draw for the contents as needed. |
| if (!content_is_cached) { |
| // Cache the results when drawn with 100% opacity, then draw the cached |
| // results at the desired opacity. This avoids having to generate different |
| // caches under varying opacity filters. |
| float old_opacity = draw_state_.opacity; |
| draw_state_.opacity = 1.0f; |
| FallbackRasterize(node, target_info, content_rect); |
| draw_state_.opacity = old_opacity; |
| } |
| |
| // Sub-pixel offsets are passed to the fallback rasterizer to preserve |
| // sharpness. The results should be drawn to |content_rect| which is already |
| // in screen space. |
| math::Matrix3F old_transform = draw_state_.transform; |
| draw_state_.transform = math::Matrix3F::Identity(); |
| |
| // Create the appropriate draw object to call the draw callback, then render |
| // its results onscreen. A transparent draw must be used even if the current |
| // opacity is 100% because the contents may have transparency. |
| backend::TextureEGL* texture = target_info.framebuffer->GetColorTexture(); |
| math::Matrix3F texcoord_transform = GetTexcoordTransform(target_info); |
| if (draw_state_.opacity == 1.0f) { |
| scoped_ptr<DrawObject> draw(new DrawRectTexture(graphics_state_, |
| draw_state_, content_rect, texture, texcoord_transform)); |
| AddTransparentDraw(draw.Pass(), content_rect); |
| } else { |
| scoped_ptr<DrawObject> draw(new DrawRectColorTexture(graphics_state_, |
| draw_state_, content_rect, kOpaqueWhite, texture, texcoord_transform, |
| false /* clamp_texcoords */)); |
| AddTransparentDraw(draw.Pass(), content_rect); |
| } |
| |
| draw_state_.transform = old_transform; |
| } |
| |
| void RenderTreeNodeVisitor::FallbackRasterize( |
| scoped_refptr<render_tree::Node> node, |
| const OffscreenTargetManager::TargetInfo& target_info, |
| const math::RectF& content_rect) { |
| // It is not permitted to render to an offscreen target while already |
| // rendering to an offscreen target. To allow this path, ensure that |
| // render targets are not used as both the read and write targets for any |
| // call. (Although these reads and writes should occur in different regions |
| // of the target, not all drivers may handle this properly.) Also ensure the |
| // draw object manager will sort these draws properly. |
| DCHECK(!render_target_is_offscreen_); |
| |
| uint32_t rasterize_flags = 0; |
| |
| // Pre-translate the content so it starts in target_info.region. |
| math::Matrix3F content_transform = |
| math::TranslateMatrix(target_info.region.x() - content_rect.x(), |
| target_info.region.y() - content_rect.y()) * |
| draw_state_.transform; |
| base::Closure rasterize_callback = base::Bind(fallback_rasterize_, |
| node, target_info.skia_canvas, content_transform, target_info.region, |
| draw_state_.opacity, rasterize_flags); |
| scoped_ptr<DrawObject> draw(new DrawCallback(rasterize_callback)); |
| |
| backend::RenderTarget* old_render_target = render_target_; |
| bool old_render_target_is_offscreen = render_target_is_offscreen_; |
| |
| render_target_ = target_info.framebuffer; |
| render_target_is_offscreen_ = true; |
| AddExternalDraw(draw.Pass(), target_info.region, node->GetTypeId()); |
| |
| render_target_ = old_render_target; |
| render_target_is_offscreen_ = old_render_target_is_offscreen; |
| } |
| |
| // Add draw objects to render |node| to an offscreen render target at |
| // 100% opacity. |
| // |out_texture| and |out_texcoord_transform| describe the texture subregion |
| // that will contain the result of rendering |node|. If not enough memory |
| // is available for the offscreen target, then |out_texture| will be null. |
| // |out_content_rect| describes the onscreen rect (in screen space) which |
| // should be used to render node's contents. |
| void RenderTreeNodeVisitor::OffscreenRasterize( |
| scoped_refptr<render_tree::Node> node, |
| const backend::TextureEGL** out_texture, |
| math::Matrix3F* out_texcoord_transform, |
| math::RectF* out_content_rect) { |
| OffscreenTargetManager::TargetInfo target_info; |
| bool content_is_cached = false; |
| GetOffscreenTarget(node, &content_is_cached, &target_info, out_content_rect); |
| |
| if (out_content_rect->IsEmpty()) { |
| return; |
| } |
| |
| if (target_info.framebuffer == nullptr) { |
| // No offscreen target was available. |
| *out_texture = nullptr; |
| return; |
| } |
| |
| *out_texture = target_info.framebuffer->GetColorTexture(); |
| *out_texcoord_transform = GetTexcoordTransform(target_info); |
| |
| if (!content_is_cached) { |
| // Cache the results at 100% opacity. The caller is responsible for |
| // drawing the cached results at the desired opacity. This avoids having |
| // to generate different caches under varying opacity filters. |
| float old_opacity = draw_state_.opacity; |
| draw_state_.opacity = 1.0f; |
| |
| // Try to use the native rasterizer to handle the offscreen rendering. |
| // However, because offscreen targets are actually regions of a texture |
| // atlas, some drivers may not properly handle reading and writing to |
| // the same texture -- even if the operations occur in different regions. |
| // So native offscreen handling can only occur if |node| or its children |
| // do not also need offscreen targets (or this particular target). The |
| // alternative is to use the fallback rasterizer since it allocates its |
| // own render targets as needed. |
| // |
| // Ideally, pre-check |node| and its children to see if they will need |
| // an offscreen target. However, this would result in a lot of duplicate |
| // code. So just process the nodes into draws, and if any of them requests |
| // an offscreen target, then remove all the recently added draws, and use |
| // the fallback rasterizer instead of the native rasterizer. |
| uint32_t last_valid_draw_id = last_draw_id_; |
| bool old_allow_offscreen_targets = allow_offscreen_targets_; |
| bool old_failed_offscreen_target_request = failed_offscreen_target_request_; |
| allow_offscreen_targets_ = false; |
| failed_offscreen_target_request_ = false; |
| |
| // Push a new render state to rasterize to the offscreen render target. |
| DrawObject::BaseState old_draw_state = draw_state_; |
| SkCanvas* old_fallback_render_target = fallback_render_target_; |
| backend::RenderTarget* old_render_target = render_target_; |
| bool old_render_target_is_offscreen = render_target_is_offscreen_; |
| |
| // Adjust the transform to render into target_info.region. |
| draw_state_.transform = |
| math::TranslateMatrix(target_info.region.x() - out_content_rect->x(), |
| target_info.region.y() - out_content_rect->y()) * |
| draw_state_.transform; |
| draw_state_.scissor = RoundRectFToInt(target_info.region); |
| fallback_render_target_ = target_info.skia_canvas; |
| render_target_ = target_info.framebuffer; |
| render_target_is_offscreen_ = true; |
| |
| node->Accept(this); |
| |
| draw_state_ = old_draw_state; |
| fallback_render_target_ = old_fallback_render_target; |
| render_target_ = old_render_target; |
| render_target_is_offscreen_ = old_render_target_is_offscreen; |
| |
| bool use_fallback_rasterizer = failed_offscreen_target_request_; |
| allow_offscreen_targets_ = old_allow_offscreen_targets; |
| failed_offscreen_target_request_ = old_failed_offscreen_target_request; |
| |
| if (use_fallback_rasterizer) { |
| // The node or one of its children needed an offscreen target, so this |
| // cannot be rendered natively. Remove all the draws added for |node|, |
| // and just use the fallback rasterizer instead. |
| draw_object_manager_->RemoveDraws(last_valid_draw_id); |
| FallbackRasterize(node, target_info, *out_content_rect); |
| } |
| |
| draw_state_.opacity = old_opacity; |
| } |
| } |
| |
| bool RenderTreeNodeVisitor::IsVisible(const math::RectF& bounds) { |
| math::RectF intersection = IntersectRects( |
| draw_state_.transform.MapRect(bounds), draw_state_.scissor); |
| return !intersection.IsEmpty(); |
| } |
| |
| void RenderTreeNodeVisitor::AddOpaqueDraw(scoped_ptr<DrawObject> object, |
| const math::RectF& local_bounds) { |
| base::TypeId draw_type = object->GetTypeId(); |
| if (render_target_is_offscreen_) { |
| last_draw_id_ = draw_object_manager_->AddOffscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendNone, draw_type, render_target_, |
| draw_state_.transform.MapRect(local_bounds)); |
| } else { |
| last_draw_id_ = draw_object_manager_->AddOnscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendNone, draw_type, render_target_, |
| draw_state_.transform.MapRect(local_bounds)); |
| } |
| } |
| |
| void RenderTreeNodeVisitor::AddTransparentDraw(scoped_ptr<DrawObject> object, |
| const math::RectF& local_bounds) { |
| base::TypeId draw_type = object->GetTypeId(); |
| if (render_target_is_offscreen_) { |
| last_draw_id_ = draw_object_manager_->AddOffscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendSrcAlpha, draw_type, render_target_, |
| draw_state_.transform.MapRect(local_bounds)); |
| } else { |
| last_draw_id_ = draw_object_manager_->AddOnscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendSrcAlpha, draw_type, render_target_, |
| draw_state_.transform.MapRect(local_bounds)); |
| } |
| } |
| |
| void RenderTreeNodeVisitor::AddExternalDraw(scoped_ptr<DrawObject> object, |
| const math::RectF& world_bounds, base::TypeId draw_type) { |
| if (render_target_is_offscreen_) { |
| last_draw_id_ = draw_object_manager_->AddOffscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendExternal, draw_type, render_target_, |
| world_bounds); |
| } else { |
| last_draw_id_ = draw_object_manager_->AddOnscreenDraw(object.Pass(), |
| DrawObjectManager::kBlendExternal, draw_type, render_target_, |
| world_bounds); |
| } |
| } |
| |
| } // namespace egl |
| } // namespace rasterizer |
| } // namespace renderer |
| } // namespace cobalt |