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// Copyright 2014 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/overlay_strategy_single_on_top.h"
#include <limits>
#include "cc/quads/draw_quad.h"
#include "cc/quads/solid_color_draw_quad.h"
#include "cc/quads/stream_video_draw_quad.h"
#include "cc/quads/texture_draw_quad.h"
#include "ui/gfx/geometry/point3_f.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/transform.h"
namespace cc {
OverlayStrategySingleOnTop::OverlayStrategySingleOnTop(
OverlayCandidateValidator* capability_checker,
ResourceProvider* resource_provider)
: capability_checker_(capability_checker),
resource_provider_(resource_provider) {}
bool OverlayStrategySingleOnTop::IsOverlayQuad(const DrawQuad* draw_quad) {
unsigned int resource_id;
switch (draw_quad->material) {
case DrawQuad::TEXTURE_CONTENT:
resource_id = TextureDrawQuad::MaterialCast(draw_quad)->resource_id;
break;
case DrawQuad::STREAM_VIDEO_CONTENT:
resource_id = StreamVideoDrawQuad::MaterialCast(draw_quad)->resource_id;
break;
default:
return false;
}
return resource_provider_->AllowOverlay(resource_id);
}
bool OverlayStrategySingleOnTop::GetTextureQuadInfo(
const TextureDrawQuad& quad,
OverlayCandidate* quad_info) {
gfx::OverlayTransform overlay_transform =
OverlayCandidate::GetOverlayTransform(quad.quadTransform(), quad.flipped);
if (quad.background_color != SK_ColorTRANSPARENT ||
quad.premultiplied_alpha ||
overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
return false;
quad_info->resource_id = quad.resource_id;
quad_info->transform = overlay_transform;
quad_info->uv_rect = BoundingRect(quad.uv_top_left, quad.uv_bottom_right);
return true;
}
bool OverlayStrategySingleOnTop::GetVideoQuadInfo(
const StreamVideoDrawQuad& quad,
OverlayCandidate* quad_info) {
gfx::OverlayTransform overlay_transform =
OverlayCandidate::GetOverlayTransform(quad.quadTransform(), false);
if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
return false;
if (!quad.matrix.IsScaleOrTranslation()) {
// We cannot handle anything other than scaling & translation for texture
// coordinates yet.
return false;
}
quad_info->resource_id = quad.resource_id;
quad_info->transform = overlay_transform;
gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
quad.matrix.TransformPoint(&uv0);
quad.matrix.TransformPoint(&uv1);
gfx::Vector3dF delta = uv1 - uv0;
if (delta.x() < 0) {
quad_info->transform = OverlayCandidate::ModifyTransform(
quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL);
float x0 = uv0.x();
uv0.set_x(uv1.x());
uv1.set_x(x0);
delta.set_x(-delta.x());
}
if (delta.y() < 0) {
// In this situation, uv0y < uv1y. Since we overlay inverted, a request
// to invert the source texture means we can just output the texture
// normally and it will be correct.
quad_info->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
} else {
quad_info->transform = OverlayCandidate::ModifyTransform(
quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL);
quad_info->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
}
return true;
}
bool OverlayStrategySingleOnTop::GetCandidateQuadInfo(
const DrawQuad& draw_quad,
OverlayCandidate* quad_info) {
// All quad checks.
if (draw_quad.needs_blending || draw_quad.shared_quad_state->opacity != 1.f ||
draw_quad.shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
return false;
if (draw_quad.material == DrawQuad::TEXTURE_CONTENT) {
const TextureDrawQuad& quad = *TextureDrawQuad::MaterialCast(&draw_quad);
if (!GetTextureQuadInfo(quad, quad_info))
return false;
} else if (draw_quad.material == DrawQuad::STREAM_VIDEO_CONTENT) {
const StreamVideoDrawQuad& quad =
*StreamVideoDrawQuad::MaterialCast(&draw_quad);
if (!GetVideoQuadInfo(quad, quad_info))
return false;
}
quad_info->format = RGBA_8888;
quad_info->display_rect = OverlayCandidate::GetOverlayRect(
draw_quad.quadTransform(), draw_quad.rect);
return true;
}
bool OverlayStrategySingleOnTop::Attempt(
RenderPassList* render_passes_in_draw_order,
OverlayCandidateList* candidate_list) {
// Only attempt to handle very simple case for now.
if (!capability_checker_)
return false;
RenderPass* root_render_pass = render_passes_in_draw_order->back();
DCHECK(root_render_pass);
OverlayCandidate candidate;
QuadList& quad_list = root_render_pass->quad_list;
auto candidate_iterator = quad_list.end();
for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
const DrawQuad* draw_quad = *it;
if (IsOverlayQuad(draw_quad)) {
// Check that no prior quads overlap it.
bool intersects = false;
gfx::RectF rect = draw_quad->rect;
draw_quad->quadTransform().TransformRect(&rect);
for (auto overlap_iter = quad_list.cbegin(); overlap_iter != it;
++overlap_iter) {
gfx::RectF overlap_rect = overlap_iter->rect;
overlap_iter->quadTransform().TransformRect(&overlap_rect);
if (rect.Intersects(overlap_rect)) {
intersects = true;
break;
}
}
if (intersects || !GetCandidateQuadInfo(*draw_quad, &candidate))
continue;
candidate_iterator = it;
break;
}
}
if (candidate_iterator == quad_list.end())
return false;
// Add our primary surface.
OverlayCandidateList candidates;
OverlayCandidate main_image;
main_image.display_rect = root_render_pass->output_rect;
candidates.push_back(main_image);
// Add the overlay.
candidate.plane_z_order = 1;
candidates.push_back(candidate);
// Check for support.
capability_checker_->CheckOverlaySupport(&candidates);
// If the candidate can be handled by an overlay, create a pass for it.
if (candidates[1].overlay_handled) {
quad_list.EraseAndInvalidateAllPointers(candidate_iterator);
candidate_list->swap(candidates);
return true;
}
return false;
}
} // namespace cc
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