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#include "cru/platform/graphics/cairo/PangoTextLayout.h"
#include "cru/base/StringUtil.h"
#include "cru/platform/Check.h"
#include "cru/platform/GraphicsBase.h"
#include "cru/platform/graphics/Base.h"
#include "cru/platform/graphics/cairo/CairoGraphicsFactory.h"
#include "cru/platform/graphics/cairo/PangoFont.h"
#include <pango/pangocairo.h>
namespace cru::platform::graphics::cairo {
namespace {
Rect ConvertFromPango(const Rect& rect) {
auto result = rect;
result.left /= PANGO_SCALE;
result.top /= PANGO_SCALE;
result.width /= PANGO_SCALE;
result.height /= PANGO_SCALE;
return result;
}
} // namespace
PangoTextLayout::PangoTextLayout(CairoGraphicsFactory* factory,
std::shared_ptr<IFont> font)
: CairoResource(factory) {
Expects(font);
font_ = CheckPlatform<PangoFont>(font, GetPlatformId());
pango_layout_ = pango_cairo_create_layout(factory->GetDefaultCairo());
pango_layout_set_font_description(pango_layout_,
font_->GetPangoFontDescription());
};
PangoTextLayout::~PangoTextLayout() { g_object_unref(pango_layout_); }
String PangoTextLayout::GetText() { return text_; }
void PangoTextLayout::SetText(String new_text) {
text_ = std::move(new_text);
utf8_text_ = text_.ToUtf8();
pango_layout_set_text(pango_layout_, utf8_text_.c_str(), utf8_text_.size());
}
std::shared_ptr<IFont> PangoTextLayout::GetFont() { return font_; }
void PangoTextLayout::SetFont(std::shared_ptr<IFont> font) {
Expects(font);
font_ = CheckPlatform<PangoFont>(font, GetPlatformId());
pango_layout_set_font_description(pango_layout_,
font_->GetPangoFontDescription());
}
void PangoTextLayout::SetMaxWidth(float max_width) {
return pango_layout_set_width(pango_layout_, max_width * PANGO_SCALE);
}
void PangoTextLayout::SetMaxHeight(float max_height) {
return pango_layout_set_height(pango_layout_, max_height * PANGO_SCALE);
}
bool PangoTextLayout::IsEditMode() { return edit_mode_; }
void PangoTextLayout::SetEditMode(bool enable) { edit_mode_ = enable; }
Index PangoTextLayout::GetLineIndexFromCharIndex(Index char_index) {
int line;
pango_layout_index_to_line_x(pango_layout_,
FromUtf16IndexToUtf8Index(char_index), false,
&line, nullptr);
return line;
}
Index PangoTextLayout::GetLineCount() {
return pango_layout_get_line_count(pango_layout_);
}
float PangoTextLayout::GetLineHeight(Index line_index) {
auto line = pango_layout_get_line_readonly(pango_layout_, line_index);
int height;
pango_layout_line_get_height(line, &height);
return static_cast<float>(height) / PANGO_SCALE;
}
Index PangoTextLayout::FromUtf8IndexToUtf16Index(Index index) {
Utf8CodePointIterator iter(utf8_text_.data(), utf8_text_.size());
int cp_count = 0;
while ((!iter.IsPastEnd()) && iter.GetPosition() < index) {
++iter;
cp_count++;
}
return text_.IndexFromCodePointToCodeUnit(cp_count);
}
Index PangoTextLayout::FromUtf16IndexToUtf8Index(Index index) {
Index cp_index = text_.IndexFromCodeUnitToCodePoint(index);
Utf8CodePointIterator iter(utf8_text_.data(), utf8_text_.size());
for (Index i = 0; i < cp_index; ++i) {
++iter;
}
return iter.GetPosition();
}
Rect PangoTextLayout::GetTextBounds(bool includingTrailingSpace) {
PangoRectangle rectangle;
pango_layout_get_extents(pango_layout_, &rectangle, nullptr);
return ConvertFromPango(
Rect(rectangle.x, rectangle.y, rectangle.width, rectangle.height));
}
std::vector<Rect> PangoTextLayout::TextRangeRect(const TextRange& text_range) {
auto tr = text_range.Normalize();
auto utf8_start_index = FromUtf16IndexToUtf8Index(tr.GetStart());
auto utf8_end_index = FromUtf16IndexToUtf8Index(tr.GetEnd());
int start_line_index, end_line_index, start_x_pos, end_x_pos;
pango_layout_index_to_line_x(pango_layout_, utf8_start_index, false,
&start_line_index, &start_x_pos);
pango_layout_index_to_line_x(pango_layout_, utf8_end_index, false,
&end_line_index, &end_x_pos);
if (start_line_index == end_line_index) {
auto line = pango_layout_get_line(pango_layout_, start_line_index);
PangoRectangle rectangle;
pango_layout_line_get_extents(line, &rectangle, nullptr);
return {ConvertFromPango(Rect(rectangle.x + start_x_pos, rectangle.y,
end_x_pos - start_x_pos, rectangle.height))};
} else {
std::vector<Rect> result;
PangoRectangle rectangle;
auto start_line = pango_layout_get_line(pango_layout_, start_line_index);
pango_layout_line_get_extents(start_line, &rectangle, nullptr);
result.push_back(Rect(rectangle.x + start_x_pos, rectangle.y,
rectangle.width - start_x_pos, rectangle.height));
for (int line_index = start_line_index + 1; line_index < end_line_index;
line_index++) {
auto line = pango_layout_get_line(pango_layout_, line_index);
pango_layout_line_get_extents(line, &rectangle, nullptr);
result.push_back(
Rect(rectangle.x, rectangle.y, rectangle.width, rectangle.height));
}
auto end_line = pango_layout_get_line(pango_layout_, end_line_index);
pango_layout_line_get_extents(end_line, &rectangle, nullptr);
result.push_back(
Rect(rectangle.x, rectangle.y, end_x_pos, rectangle.height));
for (auto& r : result) {
r = ConvertFromPango(r);
}
return result;
}
}
Rect PangoTextLayout::TextSinglePoint(Index position, bool trailing) {
auto utf8_index = FromUtf16IndexToUtf8Index(position);
int line_index, x_pos;
pango_layout_index_to_line_x(pango_layout_, utf8_index, trailing, &line_index,
&x_pos);
auto line = pango_layout_get_line(pango_layout_, line_index);
PangoRectangle rectangle;
pango_layout_line_get_extents(line, &rectangle, nullptr);
return ConvertFromPango(
Rect(rectangle.x + x_pos, rectangle.y, 0, rectangle.height));
}
TextHitTestResult PangoTextLayout::HitTest(const Point& point) {
int index, trailing;
auto inside_text =
pango_layout_xy_to_index(pango_layout_, point.x * PANGO_SCALE,
point.y * PANGO_SCALE, &index, &trailing);
return TextHitTestResult{FromUtf8IndexToUtf16Index(index), trailing != 0,
inside_text != 0};
}
} // namespace cru::platform::graphics::cairo
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