add text_measure_span (c72be025) · Commits · github_fork / Clip

common/graphics/text_layout.cc

+45 −0

Original line number	Diff line number	Diff line
		@@ -33,6 +33,51 @@
		namespace plotfx {
		namespace text {

		Status text_measure_span(
		const std::string& text,
		const FontInfo& font_info,
		double font_size,
		double dpi,
		TextHAlign align,
		TextShaper* shaper,
		Rectangle* rect) {
		double line_length = 0;
		double top = 0.0f;
		double bottom = 0.0f;

		std::vector<GlyphInfo> glyphs;
		auto rc = shaper->shapeText(
		text,
		font_info,
		font_size,
		dpi,
		[&] (const GlyphInfo& gi) {
		line_length += gi.advance_x;
		top = std::min(-gi.metrics_ascender, top);
		bottom = std::max(-gi.metrics_descender, bottom);
		glyphs.emplace_back(gi);
		});

		if (rc != OK) {
		return rc;
		}

		auto left = 0;
		switch (align) {
		case TextHAlign::LEFT:
		break;
		case TextHAlign::CENTER:
		left = -line_length / 2;
		break;
		case TextHAlign::RIGHT:
		left = -line_length;
		break;
		}

		*rect = Rectangle(left, top, line_length, bottom - top);
		return OK;
		}

		Status layoutTextLTR(
		const std::string& text,
		double x,

+14 −0

Original line number	Diff line number	Diff line
		@@ -30,10 +30,24 @@
		#pragma once
		#include <graphics/text.h>
		#include <graphics/text_shaper.h>
		#include <graphics/layout.h>

		namespace plotfx {
		namespace text {

		/**
		* Measure the size of a span of text where (0, 0) is the baseline of the first
		* glyph
		*/
		Status text_measure_span(
		const std::string& text,
		const FontInfo& font_info,
		double font_size,
		double dpi,
		TextHAlign align,
		TextShaper* shaper,
		Rectangle* rect);

		/**
		* Layout a single line of text
		*/