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#include "cru/win/graph/direct/text_layout.hpp"
#include "cru/platform/check.hpp"
#include "cru/win/graph/direct/exception.hpp"
#include "cru/win/graph/direct/factory.hpp"
#include "cru/win/graph/direct/font.hpp"
#include "cru/win/string.hpp"
#include <cassert>
#include <utility>
namespace cru::platform::graph::win::direct {
using cru::platform::win::IndexUtf16ToUtf8;
using cru::platform::win::IndexUtf8ToUtf16;
DWriteTextLayout::DWriteTextLayout(DirectGraphFactory* factory,
std::shared_ptr<IFont> font,
std::string text)
: DirectGraphResource(factory), text_(std::move(text)) {
assert(font);
font_ = CheckPlatform<DWriteFont>(font, GetPlatformId());
w_text_ = cru::platform::win::ToUtf16String(text_);
ThrowIfFailed(factory->GetDWriteFactory()->CreateTextLayout(
w_text_.c_str(), static_cast<UINT32>(w_text_.size()),
font_->GetComInterface(), max_width_, max_height_, &text_layout_));
}
DWriteTextLayout::~DWriteTextLayout() = default;
std::string DWriteTextLayout::GetText() { return text_; }
void DWriteTextLayout::SetText(std::string new_text) {
text_.swap(new_text);
w_text_ = cru::platform::win::ToUtf16String(text_);
ThrowIfFailed(GetDirectFactory()->GetDWriteFactory()->CreateTextLayout(
w_text_.c_str(), static_cast<UINT32>(w_text_.size()),
font_->GetComInterface(), max_width_, max_height_, &text_layout_));
}
std::shared_ptr<IFont> DWriteTextLayout::GetFont() {
return std::dynamic_pointer_cast<IFont>(font_);
}
void DWriteTextLayout::SetFont(std::shared_ptr<IFont> font) {
font_ = CheckPlatform<DWriteFont>(font, GetPlatformId());
ThrowIfFailed(GetDirectFactory()->GetDWriteFactory()->CreateTextLayout(
w_text_.c_str(), static_cast<UINT32>(w_text_.size()),
font_->GetComInterface(), max_width_, max_height_, &text_layout_));
}
void DWriteTextLayout::SetMaxWidth(float max_width) {
max_width_ = max_width;
ThrowIfFailed(text_layout_->SetMaxWidth(max_width_));
}
void DWriteTextLayout::SetMaxHeight(float max_height) {
max_height_ = max_height;
ThrowIfFailed(text_layout_->SetMaxHeight(max_height_));
}
Rect DWriteTextLayout::GetTextBounds() {
DWRITE_TEXT_METRICS metrics;
ThrowIfFailed(text_layout_->GetMetrics(&metrics));
return Rect{metrics.left, metrics.top, metrics.width, metrics.height};
}
std::vector<Rect> DWriteTextLayout::TextRangeRect(const TextRange& text_range) {
// TODO: This can be faster with one iteration.
const int start_index =
IndexUtf8ToUtf16(text_, static_cast<int>(text_range.position), w_text_);
const int end_index = IndexUtf8ToUtf16(
text_, static_cast<int>(text_range.position + text_range.count), w_text_);
DWRITE_TEXT_METRICS text_metrics;
ThrowIfFailed(text_layout_->GetMetrics(&text_metrics));
const auto metrics_count =
text_metrics.lineCount * text_metrics.maxBidiReorderingDepth;
std::vector<DWRITE_HIT_TEST_METRICS> hit_test_metrics(metrics_count);
UINT32 actual_count;
text_layout_->HitTestTextRange(static_cast<UINT32>(start_index),
static_cast<UINT32>(end_index - start_index),
0, 0, hit_test_metrics.data(), metrics_count,
&actual_count);
hit_test_metrics.erase(hit_test_metrics.cbegin() + actual_count,
hit_test_metrics.cend());
std::vector<Rect> result;
result.reserve(actual_count);
for (const auto& metrics : hit_test_metrics) {
result.push_back(Rect{metrics.left, metrics.top,
metrics.left + metrics.width,
metrics.top + metrics.height});
}
return result;
}
} // namespace cru::platform::graph::win::direct
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