From 9e0c9d3499bc50c3534b4dc500d8b5d0b5f22752 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 15 May 2022 13:56:40 +0800
Subject: ...

---
 src/platform/graphics/direct2d/TextLayout.cpp | 162 ++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 src/platform/graphics/direct2d/TextLayout.cpp

(limited to 'src/platform/graphics/direct2d/TextLayout.cpp')

diff --git a/src/platform/graphics/direct2d/TextLayout.cpp b/src/platform/graphics/direct2d/TextLayout.cpp
new file mode 100644
index 00000000..5bc392de
--- /dev/null
+++ b/src/platform/graphics/direct2d/TextLayout.cpp
@@ -0,0 +1,162 @@
+#include "cru/platform/graphics/direct2d/TextLayout.h"
+#include <dwrite.h>
+
+#include "cru/common/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, String text)
+    : DirectGraphicsResource(factory), text_(std::move(text)) {
+  Expects(font);
+  font_ = CheckPlatform<DWriteFont>(font, GetPlatformId());
+
+  ThrowIfFailed(factory->GetDWriteFactory()->CreateTextLayout(
+      reinterpret_cast<const wchar_t*>(text_.c_str()),
+      static_cast<UINT32>(text_.size()), font_->GetComInterface(), max_width_,
+      max_height_, &text_layout_));
+}
+
+DWriteTextLayout::~DWriteTextLayout() = default;
+
+String DWriteTextLayout::GetText() { return text_; }
+
+void DWriteTextLayout::SetText(String new_text) {
+  text_ = std::move(new_text);
+  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_));
+}
+
+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] == u'\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 = text_range_arg.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) {
+  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 = metrics.textPosition;
+  result.trailing = trailing != 0;
+  return result;
+}
+}  // namespace cru::platform::graphics::direct2d
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