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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/paint_preview/common/paint_preview_tracker.h"
#include <stdint.h>
#include <string>
#include <utility>
#include "base/check.h"
#include "base/containers/contains.h"
#include "components/paint_preview/common/glyph_usage.h"
#include "components/paint_preview/common/mojom/paint_preview_recorder.mojom.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkMatrix.h"
#include "third_party/skia/include/core/SkTextBlob.h"
#include "third_party/skia/include/core/SkTypeface.h"
#include "ui/gfx/geometry/rect.h"
#include "url/gurl.h"
namespace paint_preview {
namespace {
constexpr int kMaxGlyphsForDenseGlyphUsage = 10000;
// Heuristically choose between a dense and sparse glyph usage map.
// TODO(crbug.com/40101107): Gather data to make this heuristic better.
bool ShouldUseDenseGlyphUsage(SkTypeface* typeface) {
// DenseGlyphUsage is a bitset; it is efficient if lots of glyphs are used.
// SparseGlyphUsage is a set; it is efficient if few glyphs are used.
// Generally, smaller fonts have a higher percentage of used glyphs so set a
// maximum threshold for number of glyphs before using SparseGlyphUsage.
return typeface->countGlyphs() < kMaxGlyphsForDenseGlyphUsage;
}
} // namespace
PaintPreviewTracker::PaintPreviewTracker(
const base::UnguessableToken& guid,
const std::optional<base::UnguessableToken>& embedding_token,
bool is_main_frame)
: guid_(guid),
embedding_token_(embedding_token),
is_main_frame_(is_main_frame) {}
PaintPreviewTracker::~PaintPreviewTracker() {
DCHECK(states_.empty());
}
void PaintPreviewTracker::Save() {
states_.push_back(matrix_);
}
void PaintPreviewTracker::SetMatrix(const SkMatrix& matrix) {
matrix_ = matrix;
}
void PaintPreviewTracker::Restore() {
if (states_.size() == 0) {
DLOG(ERROR) << "No state to restore";
return;
}
matrix_ = states_.back();
states_.pop_back();
}
void PaintPreviewTracker::Concat(const SkMatrix& matrix) {
if (matrix.isIdentity())
return;
matrix_.preConcat(matrix);
}
void PaintPreviewTracker::Scale(SkScalar x, SkScalar y) {
if (x != 1 || y != 1) {
matrix_.preScale(x, y);
}
}
void PaintPreviewTracker::Rotate(SkScalar degrees) {
SkMatrix m;
m.setRotate(degrees);
Concat(m);
}
void PaintPreviewTracker::Translate(SkScalar x, SkScalar y) {
if (x || y) {
matrix_.preTranslate(x, y);
}
}
uint32_t PaintPreviewTracker::CreateContentForRemoteFrame(
const gfx::Rect& rect,
const base::UnguessableToken& embedding_token) {
sk_sp<SkPicture> pic = SkPicture::MakePlaceholder(
SkRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height()));
const uint32_t content_id = pic->uniqueID();
DCHECK(!base::Contains(picture_context_.content_id_to_embedding_token,
content_id));
picture_context_.content_id_to_embedding_token[content_id] = embedding_token;
subframe_pics_[content_id] = pic;
return content_id;
}
void PaintPreviewTracker::AddGlyphs(const SkTextBlob* blob) {
if (!blob)
return;
SkTextBlob::Iter::Run run;
for (SkTextBlob::Iter it(*blob); it.next(&run);) {
SkTypeface* typeface = run.fTypeface;
// Fail fast if the number of glyphs is undetermined or 0.
if (typeface->countGlyphs() <= 0)
continue;
if (!base::Contains(typeface_glyph_usage_, typeface->uniqueID())) {
if (ShouldUseDenseGlyphUsage(typeface)) {
typeface_glyph_usage_.insert(
{typeface->uniqueID(),
std::make_unique<DenseGlyphUsage>(
static_cast<uint16_t>(typeface->countGlyphs() - 1))});
} else {
typeface_glyph_usage_.insert(
{typeface->uniqueID(),
std::make_unique<SparseGlyphUsage>(
static_cast<uint16_t>(typeface->countGlyphs() - 1))});
}
// Always set the 0th glyph.
typeface_glyph_usage_[typeface->uniqueID()]->Set(0U);
}
const uint16_t* glyphs = run.fGlyphIndices;
for (int i = 0; i < run.fGlyphCount; ++i)
typeface_glyph_usage_[typeface->uniqueID()]->Set(glyphs[i]);
}
}
void PaintPreviewTracker::AnnotateLink(const GURL& url, const SkRect& rect) {
SkRect out_rect;
matrix_.mapRect(&out_rect, rect);
links_.push_back(mojom::LinkData::New(
url, gfx::Rect(out_rect.x(), out_rect.y(), out_rect.width(),
out_rect.height())));
}
void PaintPreviewTracker::TransformClipForFrame(uint32_t id) {
auto pic_it = subframe_pics_.find(id);
if (pic_it == subframe_pics_.end())
return;
SkRect out_rect;
matrix_.mapRect(&out_rect, pic_it->second->cullRect());
picture_context_.content_id_to_transformed_clip.emplace(id, out_rect);
}
void PaintPreviewTracker::CustomDataToSkPictureCallback(SkCanvas* canvas,
uint32_t content_id) {
auto map_it = picture_context_.content_id_to_embedding_token.find(content_id);
if (map_it == picture_context_.content_id_to_embedding_token.end())
return;
auto it = subframe_pics_.find(content_id);
// DCHECK is sufficient as |subframe_pics_| has same entries as
// |content_id_to_proxy_id|.
CHECK(it != subframe_pics_.end());
SkRect rect = it->second->cullRect();
SkMatrix subframe_offset = SkMatrix::Translate(rect.x(), rect.y());
canvas->drawPicture(it->second, &subframe_offset, nullptr);
}
void PaintPreviewTracker::MoveLinks(std::vector<mojom::LinkDataPtr>* out) {
std::move(links_.begin(), links_.end(), std::back_inserter(*out));
links_.clear();
}
} // namespace paint_preview
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