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#include "cru/platform/graphics/direct2d/TextLayout.h"
#include <dwrite.h>
#include "cru/base/StringUtil.h"
#include "cru/base/log/Logger.h"
#include "cru/platform/Check.h"
#include "cru/platform/graphics/direct2d/Exception.h"
#include "cru/platform/graphics/direct2d/Factory.h"
#include "cru/platform/graphics/direct2d/Font.h"
#include <utility>
namespace cru::platform::graphics::direct2d {
DWriteTextLayout::DWriteTextLayout(DirectGraphicsFactory* factory,
std::shared_ptr<IFont> font,
std::string text)
: DirectGraphicsResource(factory), text_(std::move(text)) {
Expects(font);
font_ = CheckPlatform<DWriteFont>(font, GetPlatformId());
utf16_text_ = string::ToUtf16(text_);
ThrowIfFailed(factory->GetDWriteFactory()->CreateTextLayout(
utf16_text_.c_str(), static_cast<UINT32>(utf16_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_ = std::move(new_text);
utf16_text_ = string::ToUtf16(text_);
ThrowIfFailed(GetDirectFactory()->GetDWriteFactory()->CreateTextLayout(
utf16_text_.c_str(), static_cast<UINT32>(utf16_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(
reinterpret_cast<const wchar_t*>(text_.c_str()),
static_cast<UINT32>(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_));
}
bool DWriteTextLayout::IsEditMode() { return edit_mode_; }
void DWriteTextLayout::SetEditMode(bool enable) {
edit_mode_ = enable;
// TODO: Implement this.
}
Index DWriteTextLayout::GetLineIndexFromCharIndex(Index char_index) {
if (char_index < 0 || char_index >= text_.size()) {
return -1;
}
auto line_index = 0;
for (Index i = 0; i < char_index; ++i) {
if (text_[i] == '\n') {
line_index++;
}
}
return line_index;
}
float DWriteTextLayout::GetLineHeight(Index line_index) {
Index count = GetLineCount();
std::vector<DWRITE_LINE_METRICS> line_metrics(count);
UINT32 actual_line_count = 0;
text_layout_->GetLineMetrics(line_metrics.data(), static_cast<UINT32>(count),
&actual_line_count);
return line_metrics[line_index].height;
}
Index DWriteTextLayout::GetLineCount() {
UINT32 line_count = 0;
text_layout_->GetLineMetrics(nullptr, 0, &line_count);
return line_count;
}
Rect DWriteTextLayout::GetTextBounds(bool includingTrailingSpace) {
DWRITE_TEXT_METRICS metrics;
ThrowIfFailed(text_layout_->GetMetrics(&metrics));
return Rect{metrics.left, metrics.top,
includingTrailingSpace ? metrics.widthIncludingTrailingWhitespace
: metrics.width,
metrics.height};
}
std::vector<Rect> DWriteTextLayout::TextRangeRect(
const TextRange& text_range_arg) {
if (text_range_arg.count == 0) {
return {};
}
const auto text_range =
Range::FromTwoSides(
string::Utf16IndexCodePointToCodeUnit(
reinterpret_cast<const char16_t*>(utf16_text_.data()),
utf16_text_.size(),
string::Utf8IndexCodeUnitToCodePoint(text_.data(), text_.size(),
text_range_arg.GetStart())),
string::Utf16IndexCodePointToCodeUnit(
reinterpret_cast<const char16_t*>(utf16_text_.data()),
utf16_text_.size(),
string::Utf8IndexCodeUnitToCodePoint(text_.data(), text_.size(),
text_range_arg.GetEnd())))
.Normalize();
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;
ThrowIfFailed(text_layout_->HitTestTextRange(
static_cast<UINT32>(text_range.position),
static_cast<UINT32>(text_range.count), 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.width, metrics.height});
}
return result;
}
Rect DWriteTextLayout::TextSinglePoint(Index position, bool trailing) {
position = string::Utf16IndexCodePointToCodeUnit(
reinterpret_cast<const char16_t*>(utf16_text_.data()), utf16_text_.size(),
string::Utf8IndexCodeUnitToCodePoint(text_.data(), text_.size(),
position));
DWRITE_HIT_TEST_METRICS metrics;
FLOAT left;
FLOAT top;
ThrowIfFailed(text_layout_->HitTestTextPosition(static_cast<UINT32>(position),
static_cast<BOOL>(trailing),
&left, &top, &metrics));
return Rect{left, top, 0, GetFont()->GetFontSize()};
}
TextHitTestResult DWriteTextLayout::HitTest(const Point& point) {
BOOL trailing;
BOOL inside;
DWRITE_HIT_TEST_METRICS metrics;
ThrowIfFailed(text_layout_->HitTestPoint(point.x, point.y, &trailing, &inside,
&metrics));
TextHitTestResult result;
result.position = string::Utf8IndexCodePointToCodeUnit(
text_.data(), text_.size(),
string::Utf16IndexCodeUnitToCodePoint(
reinterpret_cast<const char16_t*>(utf16_text_.data()),
utf16_text_.size(), metrics.textPosition));
result.trailing = trailing != 0;
return result;
}
} // namespace cru::platform::graphics::direct2d
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