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// Copyright 2013 The Flutter 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 "flutter/flow/layers/texture_layer.h"
#include "flutter/common/graphics/texture.h"
namespace flutter {
TextureLayer::TextureLayer(const SkPoint& offset,
const SkSize& size,
int64_t texture_id,
bool freeze,
DlImageSampling sampling)
: offset_(offset),
size_(size),
texture_id_(texture_id),
freeze_(freeze),
sampling_(sampling) {}
void TextureLayer::Diff(DiffContext* context, const Layer* old_layer) {
DiffContext::AutoSubtreeRestore subtree(context);
if (!context->IsSubtreeDirty()) {
FML_DCHECK(old_layer);
auto prev = old_layer->as_texture_layer();
// TODO(knopp) It would be nice to be able to determine that a texture is
// dirty
context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(prev));
}
// Make sure DiffContext knows there is a TextureLayer in this subtree.
// This prevents ContainerLayer from skipping TextureLayer diffing when
// TextureLayer is inside retained layer.
// See ContainerLayer::DiffChildren
// https://github.com/flutter/flutter/issues/92925
context->MarkSubtreeHasTextureLayer();
context->AddLayerBounds(SkRect::MakeXYWH(offset_.x(), offset_.y(),
size_.width(), size_.height()));
context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion());
}
void TextureLayer::Preroll(PrerollContext* context) {
set_paint_bounds(SkRect::MakeXYWH(offset_.x(), offset_.y(), size_.width(),
size_.height()));
context->has_texture_layer = true;
context->renderable_state_flags = LayerStateStack::kCallerCanApplyOpacity;
}
void TextureLayer::Paint(PaintContext& context) const {
FML_DCHECK(needs_painting(context));
std::shared_ptr<Texture> texture =
context.texture_registry
? context.texture_registry->GetTexture(texture_id_)
: nullptr;
if (!texture) {
TRACE_EVENT_INSTANT0("flutter", "null texture");
return;
}
DlPaint paint;
Texture::PaintContext ctx{
.canvas = context.canvas,
.gr_context = context.gr_context,
.aiks_context = context.aiks_context,
.paint = context.state_stack.fill(paint),
};
texture->Paint(ctx, paint_bounds(), freeze_, sampling_);
}
} // namespace flutter