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cobalt / cobalt / 02dc75a3e28204929da5793da854c523d59e642c / . / src / cobalt / renderer / rasterizer / egl / render_tree_node_visitor.cc
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// Copyright 2017 The Cobalt Authors. 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 "starboard/configuration.h"
#if SB_API_VERSION >= 12 || SB_HAS(GLES2)
#include "cobalt/renderer/rasterizer/egl/render_tree_node_visitor.h"
#include <algorithm>
#include <cmath>
#include <limits>
#include <memory>
#include <utility>
#include "base/logging.h"
#include "base/optional.h"
#include "base/trace_event/trace_event.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_border.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_radial_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/egl/draw_rrect_color.h"
#include "cobalt/renderer/rasterizer/egl/draw_rrect_color_texture.h"
#include "cobalt/renderer/rasterizer/skia/hardware_image.h"
#include "cobalt/renderer/rasterizer/skia/image.h"
#include "cobalt/renderer/rasterizer/skia/skottie_animation.h"
namespace cobalt {
namespace renderer {
namespace rasterizer {
namespace egl {
using common::utils::IsOpaque;
using common::utils::IsTransparent;
namespace {
typedef float ColorTransformMatrix[16];
using render_tree::kMultiPlaneImageFormatYUV3PlaneBT601FullRange;
using render_tree::kMultiPlaneImageFormatYUV3PlaneBT709;
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);
const ColorTransformMatrix kBT601FullRangeColorTransformMatrixInColumnMajor = {
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, -0.34414f, 1.772f, 0.0f,
1.402f, -0.71414f, 0.0f, 0.0f, -0.701, 0.529f, -0.886f, 1.f,
};
const ColorTransformMatrix kBT709ColorTransformMatrixInColumnMajor = {
1.164f, 1.164f, 1.164f, 0.0f, 0.0f, -0.213f, 2.112f, 0.0f,
1.793f, -0.533f, 0.0f, 0.0f, -0.96925f, 0.30025f, -1.12875f, 1.0f};
const ColorTransformMatrix& GetColorTransformMatrixInColumnMajor(
render_tree::MultiPlaneImageFormat format) {
const float* transform;
if (format == kMultiPlaneImageFormatYUV3PlaneBT601FullRange) {
return kBT601FullRangeColorTransformMatrixInColumnMajor;
}
DCHECK_EQ(format, kMultiPlaneImageFormatYUV3PlaneBT709);
return kBT709ColorTransformMatrixInColumnMajor;
}
bool IsUniformSolidColor(const render_tree::Border& border) {
return border.left.style == render_tree::kBorderStyleSolid &&
border.right.style == render_tree::kBorderStyleSolid &&
border.top.style == render_tree::kBorderStyleSolid &&
border.bottom.style == render_tree::kBorderStyleSolid &&
border.left.color == border.right.color &&
border.top.color == border.bottom.color &&
border.left.color == border.top.color;
}
math::RectF RoundOut(const math::RectF& input, float pad) {
float left = std::floor(input.x() - pad);
float right = std::ceil(input.right() + pad);
float top = std::floor(input.y() - pad);
float bottom = std::ceil(input.bottom() + pad);
return math::RectF(left, top, right - left, bottom - top);
}
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);
}
math::SizeF GetTransformScale(const math::Matrix3F& transform) {
math::PointF mapped_origin = transform * math::PointF(0, 0);
math::PointF mapped_x = transform * math::PointF(1, 0);
math::PointF mapped_y = transform * math::PointF(0, 1);
math::Vector2dF mapped_vecx(mapped_x.x() - mapped_origin.x(),
mapped_x.y() - mapped_origin.y());
math::Vector2dF mapped_vecy(mapped_y.x() - mapped_origin.x(),
mapped_y.y() - mapped_origin.y());
return math::SizeF(mapped_vecx.Length(), mapped_vecy.Length());
}
bool ImageNodeSupportedNatively(render_tree::ImageNode* image_node) {
// The image node may contain nothing. For example, when it represents a video
// element before any frame is decoded.
if (!image_node->data().source) {
return true;
}
// Ensure any required backend processing is done to create the necessary
// GPU resource. This must be done to verify whether the GPU resource can
// be rendered by the shader.
skia::Image* skia_image =
base::polymorphic_downcast<skia::Image*>(image_node->data().source.get());
skia_image->EnsureInitialized();
if (skia_image->GetTypeId() == base::GetTypeId<skia::MultiPlaneImage>()) {
skia::HardwareMultiPlaneImage* hardware_image =
base::polymorphic_downcast<skia::HardwareMultiPlaneImage*>(skia_image);
// TODO: Also enable rendering of three plane BT.709 images here.
return hardware_image->GetFormat() ==
kMultiPlaneImageFormatYUV3PlaneBT601FullRange;
}
if (skia_image->GetTypeId() == base::GetTypeId<skia::SinglePlaneImage>() &&
skia_image->CanRenderInSkia()) {
skia::HardwareFrontendImage* hardware_image =
base::polymorphic_downcast<skia::HardwareFrontendImage*>(skia_image);
// We don't yet handle alternative formats that piggyback on a GL_RGBA
// texture. This comes up, for example, with UYVY (YUV 422) textures.
return !hardware_image->alternate_rgba_format();
}
return false;
}
bool RoundedRectContainsNonRoundedRect(
const math::RectF& outer_rect,
const render_tree::RoundedCorners& outer_corners,
const math::RectF& inner_rect) {
// Calculate the biggest (by area), the tallest, and the widest non-rounded
// rects contained by the rounded rect. See if one of these contains the
// inner rect.
float inset_left = std::max(outer_corners.top_left.horizontal,
outer_corners.bottom_left.horizontal);
float inset_right = std::max(outer_corners.top_right.horizontal,
outer_corners.bottom_right.horizontal);
float inset_top = std::max(outer_corners.top_left.vertical,
outer_corners.top_right.vertical);
float inset_bottom = std::max(outer_corners.bottom_left.vertical,
outer_corners.bottom_right.vertical);
// Given an ellipse centered at the origin with radii A and B, the inscribed
// rectangle with the largest area would extend A * sqrt(2) / 2 and
// B * sqrt(2) / 2 units in each quadrant.
const float kInsetScale = 0.2929f; // 1 - sqrt(2) / 2
math::RectF biggest_rect(outer_rect);
biggest_rect.Inset(kInsetScale * inset_left, kInsetScale * inset_top,
kInsetScale * inset_right, kInsetScale * inset_bottom);
math::RectF tallest_rect(outer_rect);
tallest_rect.Inset(inset_left, 0, inset_right, 0);
math::RectF widest_rect(outer_rect);
widest_rect.Inset(0, inset_top, 0, inset_bottom);
return biggest_rect.Contains(inner_rect) ||
tallest_rect.Contains(inner_rect) || widest_rect.Contains(inner_rect);
}
bool RoundedRectContainsRoundedRect(
const math::RectF& orect, const render_tree::RoundedCorners& ocorners,
const math::RectF& irect, const render_tree::RoundedCorners& icorners) {
// Use a quick and simple comparison. This may return false negatives,
// but never return false positives.
return orect.Contains(irect) &&
ocorners.top_left.horizontal <= icorners.top_left.horizontal &&
ocorners.top_left.vertical <= icorners.top_left.vertical &&
ocorners.top_right.horizontal <= icorners.top_right.horizontal &&
ocorners.top_right.vertical <= icorners.top_right.vertical &&
ocorners.bottom_right.horizontal <= icorners.bottom_right.horizontal &&
ocorners.bottom_right.vertical <= icorners.bottom_right.vertical &&
ocorners.bottom_left.horizontal <= icorners.bottom_left.horizontal &&
ocorners.bottom_left.vertical <= icorners.bottom_left.vertical;
}
bool RoundedViewportSupportedForSource(
render_tree::Node* source, math::Vector2dF offset,
const render_tree::ViewportFilter& filter) {
base::TypeId source_type = source->GetTypeId();
if (source_type == base::GetTypeId<render_tree::ImageNode>()) {
// Image nodes are supported if the image can be rendered natively.
render_tree::ImageNode* image_node =
base::polymorphic_downcast<render_tree::ImageNode*>(source);
return ImageNodeSupportedNatively(image_node);
} else if (source_type == base::GetTypeId<render_tree::RectNode>()) {
// Rect nodes are supported if they are fully contained by the filter
// (i.e. the filter effectively does nothing).
const render_tree::RectNode::Builder& rect_data =
base::polymorphic_downcast<render_tree::RectNode*>(source)->data();
math::RectF content_rect(rect_data.rect);
content_rect.Offset(offset);
if (rect_data.rounded_corners) {
return RoundedRectContainsRoundedRect(
filter.viewport(), filter.rounded_corners(), content_rect,
*rect_data.rounded_corners);
} else {
return RoundedRectContainsNonRoundedRect(
filter.viewport(), filter.rounded_corners(), content_rect);
}
} else if (source_type == base::GetTypeId<render_tree::CompositionNode>()) {
// If this is a composition of valid sources, then rendering with a rounded
// viewport is also supported.
render_tree::CompositionNode* composition_node =
base::polymorphic_downcast<render_tree::CompositionNode*>(source);
typedef render_tree::CompositionNode::Children Children;
const Children& children = composition_node->data().children();
offset += composition_node->data().offset();
for (Children::const_iterator iter = children.begin();
iter != children.end(); ++iter) {
if (!RoundedViewportSupportedForSource(iter->get(), offset, filter)) {
return false;
}
}
return true;
} else if (source_type == base::GetTypeId<render_tree::FilterNode>()) {
const render_tree::FilterNode::Builder& filter_data =
base::polymorphic_downcast<render_tree::FilterNode*>(source)->data();
// If the inner rounded viewport filter is contained by the outer
// rounded viewport filter, then just render the inner filter.
if (filter_data.viewport_filter &&
filter_data.viewport_filter->has_rounded_corners() &&
!filter_data.opacity_filter && !filter_data.blur_filter &&
!filter_data.map_to_mesh_filter) {
math::RectF viewport_rect = filter_data.viewport_filter->viewport();
viewport_rect.Offset(offset);
return RoundedRectContainsRoundedRect(
filter.viewport(), filter.rounded_corners(), viewport_rect,
filter_data.viewport_filter->rounded_corners()) &&
RoundedViewportSupportedForSource(filter_data.source.get(),
math::Vector2dF(),
*filter_data.viewport_filter);
}
return false;
}
bool is_transform =
source_type == base::GetTypeId<render_tree::MatrixTransformNode>() ||
source_type == base::GetTypeId<render_tree::MatrixTransform3DNode>();
if (!is_transform) {
// Generic nodes are handled if they are fully contained in the filter
// (i.e. the filter effectively does nothing). Transform nodes are not
// handled because their interaction with the rounded viewport filter is
// not handled.
math::RectF node_bounds(source->GetBounds());
node_bounds.Offset(offset);
return RoundedRectContainsNonRoundedRect(
filter.viewport(), filter.rounded_corners(), node_bounds);
}
return false;
}
// Return the error value of a given offscreen target cache entry.
// |desired_bounds| specifies the world-space bounds to which an offscreen
// target will be rendered.
// |cached_bounds| specifies the world-space bounds used when the offscreen
// target was generated.
// Lower return values indicate better fits. Only cache entries with an error
// less than 1 will be considered suitable.
float OffscreenTargetErrorFunction(const math::RectF& desired_bounds,
const math::RectF& cached_bounds) {
// The cached contents must be within 0.5 pixels of the desired size to avoid
// scaling artifacts.
if (std::abs(desired_bounds.width() - cached_bounds.width()) >= 0.5f ||
std::abs(desired_bounds.height() - cached_bounds.height()) >= 0.5f) {
return 1.0f;
}
// Use the cached contents' sub-pixel offset as the error rating.
math::PointF desired_offset(
desired_bounds.x() - std::floor(desired_bounds.x()),
desired_bounds.y() - std::floor(desired_bounds.y()));
math::PointF cached_offset(cached_bounds.x() - std::floor(cached_bounds.x()),
cached_bounds.y() - std::floor(cached_bounds.y()));
float error_x = std::abs(desired_offset.x() - cached_offset.x());
float error_y = std::abs(desired_offset.y() - cached_offset.y());
// Any sub-pixel offset is okay. Return something less than 1.
return (error_x + error_y) * 0.49f;
}
float OffscreenTargetErrorFunction1D(float desired, const float& cached) {
return std::abs(cached - desired);
}
} // 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),
onscreen_render_target_(render_target),
last_draw_id_(0),
fallback_rasterize_count_(0) {
draw_state_.scissor.Intersect(content_rect);
}
void RenderTreeNodeVisitor::Visit(render_tree::ClearRectNode* clear_rect_node) {
if (!IsVisible(clear_rect_node->GetBounds())) {
return;
}
DCHECK_EQ(clear_rect_node->data().rect, clear_rect_node->GetBounds());
AddClear(clear_rect_node->data().rect, clear_rect_node->data().color);
}
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());
draw_state_.rounded_scissor_rect.Offset(-data.offset());
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_.rounded_scissor_rect.Offset(data.offset());
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();
// Handle viewport-only filter.
if (data.viewport_filter && !data.opacity_filter && !data.blur_filter &&
!data.map_to_mesh_filter) {
const math::Matrix3F& transform = draw_state_.transform;
if (data.viewport_filter->has_rounded_corners()) {
// Certain source nodes have an optimized path for rendering inside
// rounded viewports.
if (RoundedViewportSupportedForSource(
data.source.get(), math::Vector2dF(), *data.viewport_filter)) {
math::RectF old_scissor_rect = draw_state_.rounded_scissor_rect;
DrawObject::OptionalRoundedCorners old_scissor_corners =
draw_state_.rounded_scissor_corners;
draw_state_.rounded_scissor_rect = data.viewport_filter->viewport();
draw_state_.rounded_scissor_corners =
data.viewport_filter->rounded_corners();
data.source->Accept(this);
draw_state_.rounded_scissor_rect = old_scissor_rect;
draw_state_.rounded_scissor_corners = old_scissor_corners;
return;
} else {
// The source is too complex and must be rendered to a texture, then
// that texture will be rendered using the rounded viewport.
DrawObject::BaseState old_draw_state = draw_state_;
// Render the source into an offscreen target at 100% opacity in its
// own local space. To avoid magnification artifacts, scale up the
// local space to match the source's size when rendered in world space.
math::Matrix3F texcoord_transform(math::Matrix3F::Identity());
math::RectF content_rect = data.source->GetBounds();
const backend::TextureEGL* texture = nullptr;
if (!IsVisible(content_rect)) {
return;
}
draw_state_.opacity = 1.0f;
math::SizeF scale = GetTransformScale(draw_state_.transform);
draw_state_.transform = math::ScaleMatrix(
std::max(1.0f, scale.width()), std::max(1.0f, scale.height()));
// Don't clip the source since it is in its own local space.
bool limit_to_screen_size = false;
math::RectF mapped_content_rect =
draw_state_.transform.MapRect(content_rect);
draw_state_.scissor =
math::Rect::RoundFromRectF(RoundOut(mapped_content_rect, 0.0f));
draw_state_.rounded_scissor_corners.reset();
OffscreenRasterize(data.source, limit_to_screen_size, &texture,
&texcoord_transform, &mapped_content_rect);
if (mapped_content_rect.IsEmpty()) {
draw_state_ = old_draw_state;
return;
}
// Then render that offscreen target with the rounded filter.
draw_state_ = old_draw_state;
draw_state_.rounded_scissor_rect = data.viewport_filter->viewport();
draw_state_.rounded_scissor_corners =
data.viewport_filter->rounded_corners();
std::unique_ptr<DrawObject> draw(new DrawRRectColorTexture(
graphics_state_, draw_state_, content_rect, kOpaqueWhite, texture,
texcoord_transform, true /* clamp_texcoords */));
AddDraw(std::move(draw), content_rect,
DrawObjectManager::kBlendSrcAlpha);
draw_state_ = old_draw_state;
return;
}
} else if (cobalt::math::IsOnlyScaleAndTranslate(transform)) {
// Orthogonal viewport filters without rounded corners can be collapsed
// into the world-space scissor.
// 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(
math::Rect::RoundFromRectF(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 (IsTransparent(filter_opacity)) {
// Totally transparent. Ignore the source.
return;
} else if (IsOpaque(filter_opacity)) {
// Totally opaque. Render like normal.
data.source->Accept(this);
return;
} else if (common::utils::NodeCanRenderWithOpacity(data.source.get())) {
// 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.
float old_opacity = draw_state_.opacity;
draw_state_.opacity = 1.0f;
// Since the offscreen target is mapped to world space, limit the target
// to the screen size to avoid unnecessarily large offscreen targets.
bool limit_to_screen_size = true;
OffscreenRasterize(data.source, limit_to_screen_size, &texture,
&texcoord_transform, &content_rect);
if (content_rect.IsEmpty()) {
draw_state_.opacity = old_opacity;
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();
draw_state_.opacity = old_opacity * filter_opacity;
std::unique_ptr<DrawObject> draw(new DrawRectColorTexture(
graphics_state_, draw_state_, content_rect, kOpaqueWhite, texture,
texcoord_transform, true /* clamp_texcoords */));
AddDraw(std::move(draw), content_rect, DrawObjectManager::kBlendSrcAlpha);
draw_state_.opacity = old_opacity;
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;
}
if (!ImageNodeSupportedNatively(image_node)) {
FallbackRasterize(image_node);
return;
}
bool clamp_texcoords = false;
skia::Image* skia_image =
base::polymorphic_downcast<skia::Image*>(data.source.get());
bool is_opaque = skia_image->IsOpaque() && IsOpaque(draw_state_.opacity);
// Calculate matrix to transform texture coordinates according to the local
// transform.
math::Matrix3F texcoord_transform(math::Matrix3F::Identity());
if (cobalt::math::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();
if (texcoord_transform.IsZeros()) {
DLOG(ERROR) << "data.local_transform is a non invertible matrix.";
return;
}
}
// Different shaders are used depending on whether the image has a single
// plane or multiple planes.
std::unique_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->GetTextureEGL()) {
return;
}
if (draw_state_.rounded_scissor_corners) {
// Transparency is used to anti-alias the rounded rect.
is_opaque = false;
draw.reset(new DrawRRectColorTexture(
graphics_state_, draw_state_, data.destination_rect, kOpaqueWhite,
hardware_image->GetTextureEGL(), texcoord_transform,
clamp_texcoords));
} else 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>()) {
skia::HardwareMultiPlaneImage* hardware_image =
base::polymorphic_downcast<skia::HardwareMultiPlaneImage*>(skia_image);
auto image_format = hardware_image->GetFormat();
auto y_texture_egl = hardware_image->GetTextureEGL(0);
auto u_texture_egl = hardware_image->GetTextureEGL(1);
auto v_texture_egl = hardware_image->GetTextureEGL(2);
if (!y_texture_egl || !u_texture_egl || !v_texture_egl) {
return;
}
const ColorTransformMatrix& color_transform_in_column_major =
GetColorTransformMatrixInColumnMajor(image_format);
if (draw_state_.rounded_scissor_corners) {
// Transparency is used to anti-alias the rounded rect.
is_opaque = false;
draw.reset(new DrawRRectColorTexture(
graphics_state_, draw_state_, data.destination_rect, kOpaqueWhite,
y_texture_egl, u_texture_egl, v_texture_egl,
color_transform_in_column_major, texcoord_transform,
clamp_texcoords));
} else if (clamp_texcoords || !is_opaque) {
draw.reset(new DrawRectColorTexture(
graphics_state_, draw_state_, data.destination_rect, kOpaqueWhite,
y_texture_egl, u_texture_egl, v_texture_egl,
color_transform_in_column_major, texcoord_transform,
clamp_texcoords));
} else {
draw.reset(new DrawRectTexture(
graphics_state_, draw_state_, data.destination_rect, y_texture_egl,
u_texture_egl, v_texture_egl, color_transform_in_column_major,
texcoord_transform));
}
} else {
NOTREACHED();
return;
}
AddDraw(std::move(draw), image_node->GetBounds(),
is_opaque ? DrawObjectManager::kBlendNoneOrSrcAlpha
: DrawObjectManager::kBlendSrcAlpha);
}
void RenderTreeNodeVisitor::Visit(render_tree::LottieNode* lottie_node) {
const render_tree::LottieNode::Builder& data = lottie_node->data();
math::RectF content_rect = data.destination_rect;
if (!IsVisible(content_rect)) {
return;
}
skia::SkottieAnimation* animation =
base::polymorphic_downcast<skia::SkottieAnimation*>(data.animation.get());
if (animation->GetSize().GetArea() == 0) {
return;
}
animation->SetAnimationTime(data.animation_time);
// Get an offscreen target to cache the animation. Make the target big enough
// to avoid scaling artifacts.
math::SizeF scale = GetTransformScale(draw_state_.transform);
math::SizeF mapped_size = content_rect.size();
// Use a uniform scale to avoid impacting aspect ratio calculations.
mapped_size.Scale(std::max(scale.width(), scale.height()));
OffscreenTargetManager::TargetInfo target_info;
if (!offscreen_target_manager_->GetCachedTarget(animation, mapped_size,
&target_info)) {
// No pre-existing target was found. Allocate a new target.
animation->ResetRenderCache();
offscreen_target_manager_->AllocateCachedTarget(animation, mapped_size,
&target_info);
}
if (target_info.framebuffer == nullptr) {
// Unable to allocate the render target for the animation cache.
return;
}
// Add a draw call to update the cache.
std::unique_ptr<DrawObject> update_cache(new DrawCallback(base::Bind(
&skia::SkottieAnimation::UpdateRenderCache, base::Unretained(animation),
base::Unretained(target_info.skia_canvas), target_info.region.size())));
draw_object_manager_->AddBatchedExternalDraw(
std::move(update_cache), lottie_node->GetTypeId(),
target_info.framebuffer, target_info.region);
// Add a draw call to render the cached animation to the current target.
backend::TextureEGL* texture = target_info.framebuffer->GetColorTexture();
math::Matrix3F texcoord_transform = GetTexcoordTransform(target_info);
if (IsOpaque(draw_state_.opacity)) {
std::unique_ptr<DrawObject> draw(
new DrawRectTexture(graphics_state_, draw_state_, content_rect, texture,
texcoord_transform));
AddDraw(std::move(draw), content_rect, DrawObjectManager::kBlendSrcAlpha);
} else {
std::unique_ptr<DrawObject> draw(new DrawRectColorTexture(
graphics_state_, draw_state_, content_rect, kOpaqueWhite, texture,
texcoord_transform, false /* clamp_texcoords */));
AddDraw(std::move(draw), content_rect, DrawObjectManager::kBlendSrcAlpha);
}
}
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_float = draw_state_.transform.MapRect(data.rect);
math::Rect mapped_rect = math::Rect::RoundFromRectF(mapped_rect_float);
data.set_bounds_cb.Run(mapped_rect);
DCHECK_EQ(data.rect, video_node->GetBounds());
AddClear(data.rect, kTransparentBlack);
}
void RenderTreeNodeVisitor::Visit(render_tree::RectNode* rect_node) {
math::RectF node_bounds(rect_node->GetBounds());
if (!IsVisible(node_bounds)) {
return;
}
const render_tree::RectNode::Builder& data = rect_node->data();
const std::unique_ptr<render_tree::Brush>& brush = data.background_brush;
base::Optional<render_tree::RoundedCorners> content_corners;
math::RectF content_rect(data.rect);
bool content_rect_drawn = false;
if (data.rounded_corners) {
content_corners = *data.rounded_corners;
}
// Only solid color brushes are natively supported with rounded corners.
if (data.rounded_corners && brush &&
brush->GetTypeId() != base::GetTypeId<render_tree::SolidColorBrush>()) {
FallbackRasterize(rect_node);
return;
}
// Determine whether the RectNode's border attribute is supported. Update
// the content and bounds if so.
std::unique_ptr<DrawObject> draw_border;
if (data.border) {
std::unique_ptr<DrawRectBorder> rect_border(
new DrawRectBorder(graphics_state_, draw_state_, rect_node));
if (rect_border->IsValid()) {
node_bounds = rect_border->GetBounds();
content_rect = rect_border->GetContentRect();
content_rect_drawn = rect_border->DrawsContentRect();
draw_border.reset(rect_border.release());
} else if (data.rounded_corners) {
// Handle the special case of uniform rounded borders.
math::Vector2dF scale = math::GetScale2d(draw_state_.transform);
bool border_is_subpixel = data.border->left.width * scale.x() < 1.0f ||
data.border->right.width * scale.x() < 1.0f ||
data.border->top.width * scale.y() < 1.0f ||
data.border->bottom.width * scale.y() < 1.0f;
if (IsUniformSolidColor(*data.border) && !border_is_subpixel) {
math::RectF border_rect(content_rect);
render_tree::RoundedCorners border_corners = *data.rounded_corners;
content_rect.Inset(data.border->left.width, data.border->top.width,
data.border->right.width, data.border->bottom.width);
content_corners = data.rounded_corners->Inset(
data.border->left.width, data.border->top.width,
data.border->right.width, data.border->bottom.width);
content_corners = content_corners->Normalize(content_rect);
draw_border.reset(new DrawRectShadowSpread(
graphics_state_, draw_state_, content_rect, content_corners,
border_rect, border_corners, data.border->top.color));
}
}
}
const bool border_supported = !data.border || draw_border;
// Determine whether the RectNode's background brush is supported.
base::TypeId brush_type =
brush ? brush->GetTypeId() : base::GetTypeId<render_tree::Brush>();
bool brush_is_solid_and_supported =
brush_type == base::GetTypeId<render_tree::SolidColorBrush>();
bool brush_is_linear_and_supported =
brush_type == base::GetTypeId<render_tree::LinearGradientBrush>();
bool brush_is_radial_and_supported =
brush_type == base::GetTypeId<render_tree::RadialGradientBrush>();
std::unique_ptr<DrawRectRadialGradient> draw_radial;
if (brush_is_radial_and_supported) {
const render_tree::RadialGradientBrush* radial_brush =
base::polymorphic_downcast<const render_tree::RadialGradientBrush*>(
brush.get());
draw_radial.reset(new DrawRectRadialGradient(
graphics_state_, draw_state_, content_rect, *radial_brush,
base::Bind(&RenderTreeNodeVisitor::GetScratchTexture,
base::Unretained(this), base::WrapRefCounted(rect_node))));
brush_is_radial_and_supported = draw_radial->IsValid();
}
const bool brush_supported = !brush || brush_is_solid_and_supported ||
brush_is_linear_and_supported ||
brush_is_radial_and_supported;
if (!brush_supported || !border_supported) {
FallbackRasterize(rect_node);
return;
}
if (draw_border) {
AddDraw(std::move(draw_border), node_bounds,
DrawObjectManager::kBlendSrcAlpha);
}
if (content_rect_drawn) {
return;
}
// Handle drawing the content.
if (brush_is_solid_and_supported) {
const render_tree::SolidColorBrush* solid_brush =
base::polymorphic_downcast<const render_tree::SolidColorBrush*>(
brush.get());
if (content_corners) {
std::unique_ptr<DrawObject> draw(
new DrawRRectColor(graphics_state_, draw_state_, content_rect,
*content_corners, solid_brush->color()));
// Transparency is used for anti-aliasing.
AddDraw(std::move(draw), node_bounds, DrawObjectManager::kBlendSrcAlpha);
} else {
std::unique_ptr<DrawObject> draw(new DrawPolyColor(
graphics_state_, draw_state_, content_rect, solid_brush->color()));
// Match the blending mode used by other rect node draws to allow
// merging of the draw objects if possible.
AddDraw(std::move(draw), node_bounds,
IsOpaque(draw_state_.opacity * solid_brush->color().a())
? DrawObjectManager::kBlendNoneOrSrcAlpha
: DrawObjectManager::kBlendSrcAlpha);
}
} else if (brush_is_linear_and_supported) {
const render_tree::LinearGradientBrush* linear_brush =
base::polymorphic_downcast<const render_tree::LinearGradientBrush*>(
brush.get());
std::unique_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
// specified area are modified.
AddDraw(std::move(draw), node_bounds, DrawObjectManager::kBlendSrcAlpha);
} else if (brush_is_radial_and_supported) {
// The colors in the brush may be transparent.
AddDraw(std::unique_ptr<DrawObject>(draw_radial.release()), node_bounds,
DrawObjectManager::kBlendSrcAlpha);
}
}
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;
std::unique_ptr<DrawObject> draw;
render_tree::ColorRGBA shadow_color(data.shadow.color);
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.
AddDraw(std::move(draw), node_bounds, DrawObjectManager::kBlendSrcAlpha);
}
void RenderTreeNodeVisitor::Visit(render_tree::TextNode* text_node) {
if (!IsVisible(text_node->GetBounds())) {
return;
}
FallbackRasterize(text_node);
}
int64_t RenderTreeNodeVisitor::GetFallbackRasterizeCount() {
return fallback_rasterize_count_;
}
// Get a scratch texture row region for use in rendering |node|.
void RenderTreeNodeVisitor::GetScratchTexture(
scoped_refptr<render_tree::Node> node, float size,
DrawObject::TextureInfo* out_texture_info) {
// Get the cached texture region or create one.
OffscreenTargetManager::TargetInfo target_info;
bool cached = offscreen_target_manager_->GetCachedTarget(
node.get(), base::Bind(&OffscreenTargetErrorFunction1D, size),
&target_info);
if (!cached) {
offscreen_target_manager_->AllocateCachedTarget(node.get(), size, size,
&target_info);
}
out_texture_info->texture = target_info.framebuffer == nullptr
? nullptr
: target_info.framebuffer->GetColorTexture();
out_texture_info->region = target_info.region;
out_texture_info->is_new = !cached;
}
// Get a cached 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::GetCachedTarget(
scoped_refptr<render_tree::Node> node, bool* out_content_cached,
OffscreenTargetManager::TargetInfo* out_target_info,
math::RectF* out_content_rect) {
math::RectF node_bounds(node->GetBounds());
if (node->GetTypeId() == base::GetTypeId<render_tree::TextNode>()) {
// Work around bug with text width calculation being slightly too small for
// cursive text.
node_bounds.set_width(node_bounds.width() * 1.01f);
}
math::RectF mapped_bounds(draw_state_.transform.MapRect(node_bounds));
if (mapped_bounds.IsEmpty()) {
*out_content_cached = true;
out_content_rect->SetRect(0.0f, 0.0f, 0.0f, 0.0f);
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.
*out_content_rect = RoundOut(mapped_bounds, 1.0f);
// Get a suitable cache of the render tree node if one exists, or allocate
// a new offscreen target if possible. The OffscreenTargetErrorFunction will
// determine whether any caches are fit for use.
// Do not cache rotating nodes since these will result in inappropriate
// reuse of offscreen targets. Transforms that are rotations of angles in
// the first quadrant will produce the same mapped rect sizes as angles in
// the other 3 quadrants. Also avoid caching reflections.
bool allow_caching =
cobalt::math::IsOnlyScaleAndTranslate(draw_state_.transform) &&
draw_state_.transform(0, 0) > 0.0f && draw_state_.transform(1, 1) > 0.0f;
if (allow_caching) {
*out_content_cached = offscreen_target_manager_->GetCachedTarget(
node.get(), base::Bind(&OffscreenTargetErrorFunction, mapped_bounds),
out_target_info);
if (!(*out_content_cached)) {
offscreen_target_manager_->AllocateCachedTarget(
node.get(), out_content_rect->size(), mapped_bounds, out_target_info);
} else {
// Maintain the size of the cached contents to avoid scaling artifacts.
out_content_rect->set_size(out_target_info->region.size());
}
} else {
*out_content_cached = false;
out_target_info->framebuffer = nullptr;
}
// If no offscreen target could be allocated, then the render tree node will
// be rendered directly onto the current render target. Use the draw scissor
// to minimize what has to be drawn.
if (out_target_info->framebuffer == nullptr) {
out_content_rect->Intersect(draw_state_.scissor);
}
}
void RenderTreeNodeVisitor::FallbackRasterize(
scoped_refptr<render_tree::Node> node) {
OffscreenTargetManager::TargetInfo target_info;
math::RectF content_rect;
if (node->GetTypeId() != base::GetTypeId<render_tree::TextNode>()) {
++fallback_rasterize_count_;
}
// Retrieve the previously cached contents or try to allocate a cached
// render target for the node.
bool content_is_cached = false;
GetCachedTarget(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);
std::unique_ptr<DrawObject> draw(new DrawCallback(rasterize_callback));
AddExternalDraw(std::move(draw), 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 (IsOpaque(draw_state_.opacity)) {
std::unique_ptr<DrawObject> draw(
new DrawRectTexture(graphics_state_, draw_state_, content_rect, texture,
texcoord_transform));
AddDraw(std::move(draw), content_rect, DrawObjectManager::kBlendSrcAlpha);
} else {
std::unique_ptr<DrawObject> draw(new DrawRectColorTexture(
graphics_state_, draw_state_, content_rect, kOpaqueWhite, texture,
texcoord_transform, false /* clamp_texcoords */));
AddDraw(std::move(draw), content_rect, DrawObjectManager::kBlendSrcAlpha);
}
draw_state_.transform = old_transform;
}
void RenderTreeNodeVisitor::FallbackRasterize(
scoped_refptr<render_tree::Node> node,
const OffscreenTargetManager::TargetInfo& target_info,
const math::RectF& content_rect) {
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);
std::unique_ptr<DrawObject> draw(new DrawCallback(rasterize_callback));
draw_object_manager_->AddBatchedExternalDraw(
std::move(draw), node->GetTypeId(), target_info.framebuffer,
target_info.region);
}
// Add draw objects to render |node| to an offscreen render target.
// |limit_to_screen_size| specifies whether the allocated render target should
// be limited to the onscreen render target size.
// |out_texture| and |out_texcoord_transform| describe the texture subregion
// that will contain the result of rendering |node|.
// |out_content_rect| describes the onscreen rect (in screen space) which
// should be used to render node's contents. This will be IsEmpty() if
// nothing needs to be rendered.
void RenderTreeNodeVisitor::OffscreenRasterize(
scoped_refptr<render_tree::Node> node, bool limit_to_screen_size,
const backend::TextureEGL** out_texture,
math::Matrix3F* out_texcoord_transform, math::RectF* out_content_rect) {
// Map the target to world space. This avoids scaling artifacts if the target
// is magnified.
math::RectF mapped_bounds = draw_state_.transform.MapRect(node->GetBounds());
if (!mapped_bounds.IsExpressibleAsRect()) {
DLOG(WARNING) << "Invalid rectangle of " << mapped_bounds.ToString()
<< " will not be rendered";
return;
}
// Check whether the node is visible.
math::RectF rounded_out_bounds = RoundOut(mapped_bounds, 0.0f);
math::RectF clipped_bounds =
math::IntersectRects(rounded_out_bounds, draw_state_.scissor);
if (clipped_bounds.IsEmpty()) {
out_content_rect->SetRect(0.0f, 0.0f, 0.0f, 0.0f);
return;
}
// Allocate an uncached render target. The smallest render target needed is
// the clipped bounds' size. However, this may be involved in an animation,
// so use the mapped size limited to the maximum visible area. This increases
// the chance that the render target can be recycled in the next frame.
OffscreenTargetManager::TargetInfo target_info;
math::SizeF target_size(rounded_out_bounds.size());
if (limit_to_screen_size) {
target_size.SetToMin(onscreen_render_target_->GetSize());
}
offscreen_target_manager_->AllocateUncachedTarget(target_size, &target_info);
if (!target_info.framebuffer) {
LOG(ERROR) << "Could not allocate framebuffer (" << target_size.width()
<< "x" << target_size.height()
<< ") for offscreen rasterization.";
out_content_rect->SetRect(0.0f, 0.0f, 0.0f, 0.0f);
return;
}
// Only the clipped bounds will be rendered.
DCHECK_GE(target_info.region.width(), clipped_bounds.width());
DCHECK_GE(target_info.region.height(), clipped_bounds.height());
target_info.region.set_size(clipped_bounds.size());
*out_content_rect = clipped_bounds;
*out_texture = target_info.framebuffer->GetColorTexture();
*out_texcoord_transform = GetTexcoordTransform(target_info);
// 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_;
fallback_render_target_ = target_info.skia_canvas;
render_target_ = target_info.framebuffer;
// The contents of this new render target will be used in a draw call to the
// previous render target. Inform the draw object manager of this dependency
// so it can sort offscreen draws appropriately.
draw_object_manager_->AddRenderTargetDependency(old_render_target,
render_target_);
// Clear the new render target. (Set the transform to the identity matrix so
// the bounds for the DrawClear comes out as the entire target region.)
draw_state_.scissor = math::Rect::RoundFromRectF(target_info.region);
draw_state_.transform = math::Matrix3F::Identity();
std::unique_ptr<DrawObject> draw_clear(
new DrawClear(graphics_state_, draw_state_, kTransparentBlack));
AddDraw(std::move(draw_clear), target_info.region,
DrawObjectManager::kBlendNone);
// Adjust the transform to render into target_info.region.
draw_state_.transform =
math::TranslateMatrix(target_info.region.x() - clipped_bounds.x(),
target_info.region.y() - clipped_bounds.y()) *
old_draw_state.transform;
node->Accept(this);
draw_state_ = old_draw_state;
fallback_render_target_ = old_fallback_render_target;
render_target_ = old_render_target;
}
bool RenderTreeNodeVisitor::IsVisible(const math::RectF& bounds) {
math::RectF rect_bounds = draw_state_.transform.MapRect(bounds);
math::RectF intersection = IntersectRects(rect_bounds, draw_state_.scissor);
return !intersection.IsEmpty();
}
void RenderTreeNodeVisitor::AddDraw(std::unique_ptr<DrawObject> object,
const math::RectF& local_bounds,
DrawObjectManager::BlendType blend_type) {
base::TypeId draw_type = object->GetTypeId();
math::RectF mapped_bounds = draw_state_.transform.MapRect(local_bounds);
if (render_target_ != onscreen_render_target_) {
last_draw_id_ = draw_object_manager_->AddOffscreenDraw(
std::move(object), blend_type, draw_type, render_target_,
mapped_bounds);
} else {
last_draw_id_ = draw_object_manager_->AddOnscreenDraw(
std::move(object), blend_type, draw_type, render_target_,
mapped_bounds);
}
}
void RenderTreeNodeVisitor::AddExternalDraw(std::unique_ptr<DrawObject> object,
const math::RectF& world_bounds,
base::TypeId draw_type) {
if (render_target_ != onscreen_render_target_) {
last_draw_id_ = draw_object_manager_->AddOffscreenDraw(
std::move(object), DrawObjectManager::kBlendExternal, draw_type,
render_target_, world_bounds);
} else {
last_draw_id_ = draw_object_manager_->AddOnscreenDraw(
std::move(object), DrawObjectManager::kBlendExternal, draw_type,
render_target_, world_bounds);
}
}
void RenderTreeNodeVisitor::AddClear(const math::RectF& rect,
const render_tree::ColorRGBA& color) {
// Check to see if we're simply trying to clear a non-transformed rectangle
// on the screen with no filters or effects applied, and if so, issue a
// clear command instead of a more general draw command, to give the GL
// driver a better chance to optimize.
if (!draw_state_.rounded_scissor_corners &&
draw_state_.transform.IsIdentity() && IsOpaque(draw_state_.opacity)) {
math::Rect old_scissor = draw_state_.scissor;
draw_state_.scissor.Intersect(math::Rect::RoundFromRectF(rect));
std::unique_ptr<DrawObject> draw_clear(
new DrawClear(graphics_state_, draw_state_, color));
AddDraw(std::move(draw_clear), rect, DrawObjectManager::kBlendNone);
draw_state_.scissor = old_scissor;
} else {
std::unique_ptr<DrawObject> draw(
new DrawPolyColor(graphics_state_, draw_state_, rect, color));
AddDraw(std::move(draw), rect, DrawObjectManager::kBlendNone);
}
}
} // namespace egl
} // namespace rasterizer
} // namespace renderer
} // namespace cobalt
#endif // SB_API_VERSION >= 12 || SB_HAS(GLES2)