| // Copyright 2019 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 "components/exo/wayland/zcr_alpha_compositing.h" |
| |
| #include <alpha-compositing-unstable-v1-server-protocol.h> |
| |
| #include "components/exo/surface.h" |
| #include "components/exo/surface_observer.h" |
| #include "components/exo/wayland/server_util.h" |
| |
| namespace exo { |
| namespace wayland { |
| namespace { |
| |
| // A property key containing a boolean set to true if a blending object is |
| // associated with surface object. |
| DEFINE_UI_CLASS_PROPERTY_KEY(bool, kSurfaceHasBlendingKey, false) |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // blending_interface: |
| |
| // Implements the blending interface to a Surface. The "blend mode" and |
| // "alpha"-state is set to SrcOver and 1 upon destruction. A window property |
| // will be set during the lifetime of this class to prevent multiple instances |
| // from being created for the same Surface. |
| class Blending : public SurfaceObserver { |
| public: |
| explicit Blending(Surface* surface) : surface_(surface) { |
| surface_->AddSurfaceObserver(this); |
| surface_->SetProperty(kSurfaceHasBlendingKey, true); |
| } |
| ~Blending() override { |
| if (surface_) { |
| surface_->RemoveSurfaceObserver(this); |
| surface_->SetBlendMode(SkBlendMode::kSrcOver); |
| surface_->SetAlpha(1.0f); |
| surface_->SetProperty(kSurfaceHasBlendingKey, false); |
| } |
| } |
| |
| void SetBlendMode(SkBlendMode blend_mode) { |
| if (surface_) |
| surface_->SetBlendMode(blend_mode); |
| } |
| |
| void SetAlpha(float value) { |
| if (surface_) |
| surface_->SetAlpha(value); |
| } |
| |
| // Overridden from SurfaceObserver: |
| void OnSurfaceDestroying(Surface* surface) override { |
| surface->RemoveSurfaceObserver(this); |
| surface_ = nullptr; |
| } |
| |
| private: |
| Surface* surface_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Blending); |
| }; |
| |
| void blending_destroy(wl_client* client, wl_resource* resource) { |
| wl_resource_destroy(resource); |
| } |
| |
| void blending_set_blending(wl_client* client, |
| wl_resource* resource, |
| uint32_t equation) { |
| switch (equation) { |
| case ZCR_BLENDING_V1_BLENDING_EQUATION_NONE: |
| GetUserDataAs<Blending>(resource)->SetBlendMode(SkBlendMode::kSrc); |
| break; |
| case ZCR_BLENDING_V1_BLENDING_EQUATION_PREMULT: |
| GetUserDataAs<Blending>(resource)->SetBlendMode(SkBlendMode::kSrcOver); |
| break; |
| case ZCR_BLENDING_V1_BLENDING_EQUATION_COVERAGE: |
| NOTIMPLEMENTED(); |
| break; |
| default: |
| DLOG(WARNING) << "Unsupported blending equation: " << equation; |
| break; |
| } |
| } |
| |
| void blending_set_alpha(wl_client* client, |
| wl_resource* resource, |
| wl_fixed_t alpha) { |
| GetUserDataAs<Blending>(resource)->SetAlpha(wl_fixed_to_double(alpha)); |
| } |
| |
| const struct zcr_blending_v1_interface blending_implementation = { |
| blending_destroy, blending_set_blending, blending_set_alpha}; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // alpha_compositing_interface: |
| |
| void alpha_compositing_destroy(wl_client* client, wl_resource* resource) { |
| wl_resource_destroy(resource); |
| } |
| |
| void alpha_compositing_get_blending(wl_client* client, |
| wl_resource* resource, |
| uint32_t id, |
| wl_resource* surface_resource) { |
| Surface* surface = GetUserDataAs<Surface>(surface_resource); |
| if (surface->GetProperty(kSurfaceHasBlendingKey)) { |
| wl_resource_post_error(resource, |
| ZCR_ALPHA_COMPOSITING_V1_ERROR_BLENDING_EXISTS, |
| "a blending object for that surface already exists"); |
| return; |
| } |
| |
| wl_resource* blending_resource = |
| wl_resource_create(client, &zcr_blending_v1_interface, 1, id); |
| |
| SetImplementation(blending_resource, &blending_implementation, |
| std::make_unique<Blending>(surface)); |
| } |
| |
| const struct zcr_alpha_compositing_v1_interface |
| alpha_compositing_implementation = {alpha_compositing_destroy, |
| alpha_compositing_get_blending}; |
| |
| } // namespace |
| |
| void bind_alpha_compositing(wl_client* client, |
| void* data, |
| uint32_t version, |
| uint32_t id) { |
| wl_resource* resource = |
| wl_resource_create(client, &zcr_alpha_compositing_v1_interface, 1, id); |
| |
| wl_resource_set_implementation(resource, &alpha_compositing_implementation, |
| data, nullptr); |
| } |
| |
| } // namespace wayland |
| } // namespace exo |