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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_buffer.h"
#include "third_party/blink/renderer/platform/fonts/character_range.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_run.h"
#include "third_party/blink/renderer/platform/fonts/shaping/shape_result_view.h"
#include "third_party/blink/renderer/platform/fonts/simple_font_data.h"
#include "third_party/blink/renderer/platform/text/text_direction.h"
#include "third_party/blink/renderer/platform/text/text_run.h"
#include "ui/gfx/geometry/point_f.h"
namespace blink {
namespace {
unsigned CharactersInShapeResult(
const HeapVector<Member<const ShapeResult>, 64>& results) {
unsigned num_characters = 0;
for (const Member<const ShapeResult>& result : results) {
num_characters += result->NumCharacters();
}
return num_characters;
}
} // namespace
void ShapeResultBuffer::ComputeRangeIn(const ShapeResult& result,
const gfx::RectF& ink_bounds,
CharacterRangeContext& context) {
result.EnsureGraphemes(StringView(context.text, context.total_num_characters,
result.NumCharacters()));
if (context.is_rtl) {
// Convert logical offsets to visual offsets, because results are in
// logical order while runs are in visual order.
if (!context.from_x && context.from >= 0 &&
static_cast<unsigned>(context.from) < result.NumCharacters()) {
context.from = result.NumCharacters() - context.from - 1;
}
if (!context.to_x && context.to >= 0 &&
static_cast<unsigned>(context.to) < result.NumCharacters()) {
context.to = result.NumCharacters() - context.to - 1;
}
context.current_x -= result.Width();
}
for (unsigned i = 0; i < result.runs_.size(); i++) {
if (!result.runs_[i]) {
continue;
}
DCHECK_EQ(context.is_rtl, result.runs_[i]->IsRtl());
int num_characters = result.runs_[i]->num_characters_;
if (!context.from_x && context.from >= 0 && context.from < num_characters) {
context.from_x = result.runs_[i]->XPositionForVisualOffset(
context.from, AdjustMidCluster::kToStart) +
context.current_x;
} else {
context.from -= num_characters;
}
if (!context.to_x && context.to >= 0 && context.to < num_characters) {
context.to_x = result.runs_[i]->XPositionForVisualOffset(
context.to, AdjustMidCluster::kToEnd) +
context.current_x;
} else {
context.to -= num_characters;
}
if (context.from_x || context.to_x) {
context.min_y = std::min(context.min_y, ink_bounds.y());
context.max_y = std::max(context.max_y, ink_bounds.bottom());
}
if (context.from_x && context.to_x) {
break;
}
context.current_x += result.runs_[i]->width_;
}
if (context.is_rtl) {
context.current_x -= result.Width();
}
context.total_num_characters += result.NumCharacters();
}
CharacterRange ShapeResultBuffer::GetCharacterRange(
const StringView& text,
TextDirection direction,
float total_width,
unsigned absolute_from,
unsigned absolute_to) const {
DCHECK_EQ(CharactersInShapeResult(results_), text.length());
// The absolute_from and absolute_to arguments represent the start/end offset
// for the entire run, from/to are continuously updated to be relative to
// the current word (ShapeResult instance).
int from = absolute_from;
int to = absolute_to;
CharacterRangeContext context{text, IsRtl(direction), from, to,
IsRtl(direction) ? total_width : 0};
for (unsigned j = 0; j < results_.size(); j++) {
const ShapeResult* result = results_[j];
ComputeRangeIn(*result, result->GetDeprecatedInkBounds(), context);
}
// The position in question might be just after the text.
if (!context.from_x && absolute_from == context.total_num_characters) {
context.from_x = direction == TextDirection::kRtl ? 0 : total_width;
}
if (!context.to_x && absolute_to == context.total_num_characters) {
context.to_x = direction == TextDirection::kRtl ? 0 : total_width;
}
if (!context.from_x) {
context.from_x = 0;
}
if (!context.to_x) {
context.to_x = direction == TextDirection::kRtl ? 0 : total_width;
}
// None of our runs is part of the selection, possibly invalid arguments.
if (!context.to_x && !context.from_x) {
context.from_x = context.to_x = 0;
}
if (*context.from_x < *context.to_x) {
return CharacterRange(*context.from_x, *context.to_x, -context.min_y,
context.max_y);
}
return CharacterRange(*context.to_x, *context.from_x, -context.min_y,
context.max_y);
}
int ShapeResultBuffer::OffsetForPosition(
const TextRun& run,
float target_x,
IncludePartialGlyphsOption partial_glyphs,
BreakGlyphsOption break_glyphs) const {
StringView text = run.ToStringView();
unsigned total_offset;
if (run.Rtl()) {
total_offset = run.length();
for (unsigned i = results_.size(); i; --i) {
const Member<const ShapeResult>& word_result = results_[i - 1];
if (!word_result)
continue;
total_offset -= word_result->NumCharacters();
if (target_x >= 0 && target_x <= word_result->Width()) {
int offset_for_word = word_result->OffsetForPosition(
target_x,
StringView(text, total_offset, word_result->NumCharacters()),
partial_glyphs, break_glyphs);
return total_offset + offset_for_word;
}
target_x -= word_result->Width();
}
} else {
total_offset = 0;
for (const Member<const ShapeResult>& word_result : results_) {
if (!word_result)
continue;
int offset_for_word = word_result->OffsetForPosition(
target_x, StringView(text, 0, word_result->NumCharacters()),
partial_glyphs, break_glyphs);
DCHECK_GE(offset_for_word, 0);
total_offset += offset_for_word;
if (target_x >= 0 && target_x <= word_result->Width())
return total_offset;
text = StringView(text, word_result->NumCharacters());
target_x -= word_result->Width();
}
}
return total_offset;
}
HeapVector<ShapeResult::RunFontData> ShapeResultBuffer::GetRunFontData() const {
HeapVector<ShapeResult::RunFontData> font_data;
for (const auto& result : results_)
result->GetRunFontData(&font_data);
return font_data;
}
ShapeResultView* ShapeResultBuffer::ViewAt(wtf_size_t index) const {
return ShapeResultView::Create(results_[index]);
}
GlyphData ShapeResultBuffer::EmphasisMarkGlyphData(
const FontDescription& font_description) const {
for (const auto& result : results_) {
for (const auto& run : result->runs_) {
DCHECK(run->font_data_);
if (run->glyph_data_.IsEmpty())
continue;
return GlyphData(run->glyph_data_[0].glyph,
run->font_data_->EmphasisMarkFontData(font_description),
run->CanvasRotation());
}
}
return GlyphData();
}
} // namespace blink
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