Codechange: split implementations of ParagraphLayouterFactory into their own file
Patric Stout
1 year ago
committed by
Patric Stout
parent
4cceaae8dc
commit
9cb60768fe
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file gfx_layout_fallback.cpp Handling of laying out text as fallback. */
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#include "stdafx.h"
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#include "gfx_layout_fallback.h"
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#include "string_func.h"
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#include "zoom_func.h"
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#include "table/control_codes.h"
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#include "safeguards.h"
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/*** Paragraph layout ***/
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/**
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* Class handling the splitting of a paragraph of text into lines and
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* visual runs.
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*
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* One constructs this class with the text that needs to be split into
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* lines. Then nextLine is called with the maximum width until nullptr is
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* returned. Each nextLine call creates VisualRuns which contain the
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* length of text that are to be drawn with the same font. In other
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* words, the result of this class is a list of sub strings with their
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* font. The sub strings are then already fully laid out, and only
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* need actual drawing.
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*
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* The positions in a visual run are sequential pairs of X,Y of the
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* begin of each of the glyphs plus an extra pair to mark the end.
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*
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* @note This variant does not handle left-to-right properly. This
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* is supported in the one ParagraphLayout coming from ICU.
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*/
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class FallbackParagraphLayout : public ParagraphLayouter {
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public:
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/** Visual run contains data about the bit of text with the same font. */
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class FallbackVisualRun : public ParagraphLayouter::VisualRun {
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Font *font; ///< The font used to layout these.
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GlyphID *glyphs; ///< The glyphs we're drawing.
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float *positions; ///< The positions of the glyphs.
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int *glyph_to_char; ///< The char index of the glyphs.
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int glyph_count; ///< The number of glyphs.
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public:
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FallbackVisualRun(Font *font, const WChar *chars, int glyph_count, int x);
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FallbackVisualRun(FallbackVisualRun &&other) noexcept;
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~FallbackVisualRun() override;
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const Font *GetFont() const override;
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int GetGlyphCount() const override;
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const GlyphID *GetGlyphs() const override;
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const float *GetPositions() const override;
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int GetLeading() const override;
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const int *GetGlyphToCharMap() const override;
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};
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/** A single line worth of VisualRuns. */
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class FallbackLine : public std::vector<FallbackVisualRun>, public ParagraphLayouter::Line {
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public:
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int GetLeading() const override;
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int GetWidth() const override;
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int CountRuns() const override;
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const ParagraphLayouter::VisualRun &GetVisualRun(int run) const override;
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int GetInternalCharLength(WChar c) const override { return 1; }
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};
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const WChar *buffer_begin; ///< Begin of the buffer.
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const WChar *buffer; ///< The current location in the buffer.
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FontMap &runs; ///< The fonts we have to use for this paragraph.
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FallbackParagraphLayout(WChar *buffer, int length, FontMap &runs);
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void Reflow() override;
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std::unique_ptr<const Line> NextLine(int max_width) override;
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};
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/**
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* Get the actual ParagraphLayout for the given buffer.
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* @param buff The begin of the buffer.
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* @param buff_end The location after the last element in the buffer.
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* @param fontMapping THe mapping of the fonts.
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* @return The ParagraphLayout instance.
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*/
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/* static */ ParagraphLayouter *FallbackParagraphLayoutFactory::GetParagraphLayout(WChar *buff, WChar *buff_end, FontMap &fontMapping)
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{
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return new FallbackParagraphLayout(buff, buff_end - buff, fontMapping);
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}
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/**
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* Append a wide character to the internal buffer.
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* @param buff The buffer to append to.
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* @param buffer_last The end of the buffer.
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* @param c The character to add.
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* @return The number of buffer spaces that were used.
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*/
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/* static */ size_t FallbackParagraphLayoutFactory::AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c)
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{
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*buff = c;
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return 1;
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}
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/**
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* Create the visual run.
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* @param font The font to use for this run.
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* @param chars The characters to use for this run.
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* @param char_count The number of characters in this run.
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* @param x The initial x position for this run.
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*/
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FallbackParagraphLayout::FallbackVisualRun::FallbackVisualRun(Font *font, const WChar *chars, int char_count, int x) :
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font(font), glyph_count(char_count)
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{
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const bool isbuiltin = font->fc->IsBuiltInFont();
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this->glyphs = MallocT<GlyphID>(this->glyph_count);
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this->glyph_to_char = MallocT<int>(this->glyph_count);
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/* Positions contains the location of the begin of each of the glyphs, and the end of the last one. */
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this->positions = MallocT<float>(this->glyph_count * 2 + 2);
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this->positions[0] = x;
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for (int i = 0; i < this->glyph_count; i++) {
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this->glyphs[i] = font->fc->MapCharToGlyph(chars[i]);
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if (isbuiltin) {
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this->positions[2 * i + 1] = font->fc->GetAscender(); // Apply sprite font's ascender.
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} else if (chars[i] >= SCC_SPRITE_START && chars[i] <= SCC_SPRITE_END) {
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this->positions[2 * i + 1] = (font->fc->GetHeight() - ScaleSpriteTrad(FontCache::GetDefaultFontHeight(font->fc->GetSize()))) / 2; // Align sprite font to centre
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} else {
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this->positions[2 * i + 1] = 0; // No ascender adjustment.
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}
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this->positions[2 * i + 2] = this->positions[2 * i] + font->fc->GetGlyphWidth(this->glyphs[i]);
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this->glyph_to_char[i] = i;
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}
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}
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/** Move constructor for visual runs.*/
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FallbackParagraphLayout::FallbackVisualRun::FallbackVisualRun(FallbackVisualRun &&other) noexcept : font(other.font), glyph_count(other.glyph_count)
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{
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this->positions = other.positions;
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this->glyph_to_char = other.glyph_to_char;
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this->glyphs = other.glyphs;
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other.positions = nullptr;
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other.glyph_to_char = nullptr;
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other.glyphs = nullptr;
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}
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/** Free all data. */
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FallbackParagraphLayout::FallbackVisualRun::~FallbackVisualRun()
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{
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free(this->positions);
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free(this->glyph_to_char);
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free(this->glyphs);
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}
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/**
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* Get the font associated with this run.
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* @return The font.
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*/
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const Font *FallbackParagraphLayout::FallbackVisualRun::GetFont() const
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{
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return this->font;
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}
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/**
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* Get the number of glyphs in this run.
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* @return The number of glyphs.
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*/
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int FallbackParagraphLayout::FallbackVisualRun::GetGlyphCount() const
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{
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return this->glyph_count;
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}
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/**
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* Get the glyphs of this run.
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* @return The glyphs.
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*/
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const GlyphID *FallbackParagraphLayout::FallbackVisualRun::GetGlyphs() const
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{
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return this->glyphs;
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}
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/**
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* Get the positions of this run.
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* @return The positions.
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*/
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const float *FallbackParagraphLayout::FallbackVisualRun::GetPositions() const
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{
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return this->positions;
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}
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/**
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* Get the glyph-to-character map for this visual run.
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* @return The glyph-to-character map.
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*/
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const int *FallbackParagraphLayout::FallbackVisualRun::GetGlyphToCharMap() const
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{
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return this->glyph_to_char;
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}
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/**
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* Get the height of this font.
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* @return The height of the font.
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*/
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int FallbackParagraphLayout::FallbackVisualRun::GetLeading() const
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{
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return this->GetFont()->fc->GetHeight();
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}
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/**
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* Get the height of the line.
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* @return The maximum height of the line.
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*/
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int FallbackParagraphLayout::FallbackLine::GetLeading() const
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{
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int leading = 0;
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for (const auto &run : *this) {
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leading = std::max(leading, run.GetLeading());
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}
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return leading;
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}
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/**
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* Get the width of this line.
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* @return The width of the line.
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*/
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int FallbackParagraphLayout::FallbackLine::GetWidth() const
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{
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if (this->size() == 0) return 0;
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/*
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* The last X position of a run contains is the end of that run.
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* Since there is no left-to-right support, taking this value of
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* the last run gives us the end of the line and thus the width.
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*/
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const auto &run = this->GetVisualRun(this->CountRuns() - 1);
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return (int)run.GetPositions()[run.GetGlyphCount() * 2];
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}
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/**
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* Get the number of runs in this line.
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* @return The number of runs.
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*/
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int FallbackParagraphLayout::FallbackLine::CountRuns() const
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{
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return (uint)this->size();
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}
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/**
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* Get a specific visual run.
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* @return The visual run.
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*/
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const ParagraphLayouter::VisualRun &FallbackParagraphLayout::FallbackLine::GetVisualRun(int run) const
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{
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return this->at(run);
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}
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/**
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* Create a new paragraph layouter.
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* @param buffer The characters of the paragraph.
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* @param length The length of the paragraph.
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* @param runs The font mapping of this paragraph.
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*/
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FallbackParagraphLayout::FallbackParagraphLayout(WChar *buffer, int length, FontMap &runs) : buffer_begin(buffer), buffer(buffer), runs(runs)
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{
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assert(runs.End()[-1].first == length);
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}
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/**
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* Reset the position to the start of the paragraph.
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*/
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void FallbackParagraphLayout::Reflow()
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{
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this->buffer = this->buffer_begin;
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}
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/**
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* Construct a new line with a maximum width.
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* @param max_width The maximum width of the string.
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* @return A Line, or nullptr when at the end of the paragraph.
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*/
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std::unique_ptr<const ParagraphLayouter::Line> FallbackParagraphLayout::NextLine(int max_width)
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{
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/* Simple idea:
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* - split a line at a newline character, or at a space where we can break a line.
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* - split for a visual run whenever a new line happens, or the font changes.
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*/
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if (this->buffer == nullptr) return nullptr;
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std::unique_ptr<FallbackLine> l(new FallbackLine());
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if (*this->buffer == '\0') {
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/* Only a newline. */
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this->buffer = nullptr;
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l->emplace_back(this->runs.front().second, this->buffer, 0, 0);
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return l;
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}
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int offset = this->buffer - this->buffer_begin;
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FontMap::iterator iter = this->runs.data();
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while (iter->first <= offset) {
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iter++;
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assert(iter != this->runs.End());
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}
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const FontCache *fc = iter->second->fc;
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const WChar *next_run = this->buffer_begin + iter->first;
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const WChar *begin = this->buffer;
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const WChar *last_space = nullptr;
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const WChar *last_char;
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int width = 0;
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for (;;) {
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WChar c = *this->buffer;
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last_char = this->buffer;
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if (c == '\0') {
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this->buffer = nullptr;
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break;
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}
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if (this->buffer == next_run) {
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int w = l->GetWidth();
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l->emplace_back(iter->second, begin, this->buffer - begin, w);
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iter++;
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assert(iter != this->runs.End());
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next_run = this->buffer_begin + iter->first;
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begin = this->buffer;
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}
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if (IsWhitespace(c)) last_space = this->buffer;
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if (IsPrintable(c) && !IsTextDirectionChar(c)) {
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int char_width = GetCharacterWidth(fc->GetSize(), c);
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width += char_width;
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if (width > max_width) {
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/* The string is longer than maximum width so we need to decide
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* what to do with it. */
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if (width == char_width) {
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/* The character is wider than allowed width; don't know
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* what to do with this case... bail out! */
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this->buffer = nullptr;
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return l;
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}
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if (last_space == nullptr) {
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/* No space has been found. Just terminate at our current
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* location. This usually happens for languages that do not
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* require spaces in strings, like Chinese, Japanese and
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* Korean. For other languages terminating mid-word might
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* not be the best, but terminating the whole string instead
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* of continuing the word at the next line is worse. */
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last_char = this->buffer;
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} else {
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/* A space is found; perfect place to terminate */
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this->buffer = last_space + 1;
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last_char = last_space;
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}
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break;
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}
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}
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this->buffer++;
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}
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if (l->size() == 0 || last_char - begin > 0) {
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int w = l->GetWidth();
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l->emplace_back(iter->second, begin, last_char - begin, w);
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}
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return l;
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}
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@ -0,0 +1,30 @@
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file gfx_layout_fallback.h Functions related to laying out the texts as fallback. */
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#ifndef GFX_LAYOUT_FALLBACK_H
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#define GFX_LAYOUT_FALLBACK_H
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#include "gfx_layout.h"
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/**
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* Helper class to construct a new #FallbackParagraphLayout.
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*/
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class FallbackParagraphLayoutFactory {
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public:
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/** Helper for GetLayouter, to get the right type. */
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typedef WChar CharType;
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/** Helper for GetLayouter, to get whether the layouter supports RTL. */
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static const bool SUPPORTS_RTL = false;
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static ParagraphLayouter *GetParagraphLayout(WChar *buff, WChar *buff_end, FontMap &fontMapping);
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static size_t AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c);
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};
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#endif /* GFX_LAYOUT_FALLBACK_H */
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@ -0,0 +1,181 @@
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/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file gfx_layout_icu.cpp Handling of laying out text with ICU. */
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#include "stdafx.h"
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#include "gfx_layout_icu.h"
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#include <unicode/ustring.h>
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#include "safeguards.h"
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/* Implementation details of LEFontInstance */
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le_int32 Font::getUnitsPerEM() const
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{
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return this->fc->GetUnitsPerEM();
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}
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le_int32 Font::getAscent() const
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{
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return this->fc->GetAscender();
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}
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le_int32 Font::getDescent() const
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{
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return -this->fc->GetDescender();
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}
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le_int32 Font::getLeading() const
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{
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return this->fc->GetHeight();
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}
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float Font::getXPixelsPerEm() const
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{
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return (float)this->fc->GetHeight();
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}
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float Font::getYPixelsPerEm() const
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{
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return (float)this->fc->GetHeight();
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}
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float Font::getScaleFactorX() const
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{
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return 1.0f;
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}
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float Font::getScaleFactorY() const
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{
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return 1.0f;
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}
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const void *Font::getFontTable(LETag tableTag) const
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{
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size_t length;
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return this->getFontTable(tableTag, length);
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}
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const void *Font::getFontTable(LETag tableTag, size_t &length) const
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{
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return this->fc->GetFontTable(tableTag, length);
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}
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LEGlyphID Font::mapCharToGlyph(LEUnicode32 ch) const
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{
|
||||
if (IsTextDirectionChar(ch)) return 0;
|
||||
return this->fc->MapCharToGlyph(ch);
|
||||
}
|
||||
|
||||
void Font::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
|
||||
{
|
||||
advance.fX = glyph == 0xFFFF ? 0 : this->fc->GetGlyphWidth(glyph);
|
||||
advance.fY = 0;
|
||||
}
|
||||
|
||||
le_bool Font::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Wrapper for doing layouts with ICU.
|
||||
*/
|
||||
class ICUParagraphLayout : public ParagraphLayouter {
|
||||
icu::ParagraphLayout *p; ///< The actual ICU paragraph layout.
|
||||
public:
|
||||
/** Visual run contains data about the bit of text with the same font. */
|
||||
class ICUVisualRun : public ParagraphLayouter::VisualRun {
|
||||
const icu::ParagraphLayout::VisualRun *vr; ///< The actual ICU vr.
|
||||
|
||||
public:
|
||||
ICUVisualRun(const icu::ParagraphLayout::VisualRun *vr) : vr(vr) { }
|
||||
|
||||
const Font *GetFont() const override { return (const Font*)vr->getFont(); }
|
||||
int GetGlyphCount() const override { return vr->getGlyphCount(); }
|
||||
const GlyphID *GetGlyphs() const override { return vr->getGlyphs(); }
|
||||
const float *GetPositions() const override { return vr->getPositions(); }
|
||||
int GetLeading() const override { return vr->getLeading(); }
|
||||
const int *GetGlyphToCharMap() const override { return vr->getGlyphToCharMap(); }
|
||||
};
|
||||
|
||||
/** A single line worth of VisualRuns. */
|
||||
class ICULine : public std::vector<ICUVisualRun>, public ParagraphLayouter::Line {
|
||||
icu::ParagraphLayout::Line *l; ///< The actual ICU line.
|
||||
|
||||
public:
|
||||
ICULine(icu::ParagraphLayout::Line *l) : l(l)
|
||||
{
|
||||
for (int i = 0; i < l->countRuns(); i++) {
|
||||
this->emplace_back(l->getVisualRun(i));
|
||||
}
|
||||
}
|
||||
~ICULine() override { delete l; }
|
||||
|
||||
int GetLeading() const override { return l->getLeading(); }
|
||||
int GetWidth() const override { return l->getWidth(); }
|
||||
int CountRuns() const override { return l->countRuns(); }
|
||||
const ParagraphLayouter::VisualRun &GetVisualRun(int run) const override { return this->at(run); }
|
||||
|
||||
int GetInternalCharLength(WChar c) const override
|
||||
{
|
||||
/* ICU uses UTF-16 internally which means we need to account for surrogate pairs. */
|
||||
return Utf8CharLen(c) < 4 ? 1 : 2;
|
||||
}
|
||||
};
|
||||
|
||||
ICUParagraphLayout(icu::ParagraphLayout *p) : p(p) { }
|
||||
~ICUParagraphLayout() override { delete p; }
|
||||
void Reflow() override { p->reflow(); }
|
||||
|
||||
std::unique_ptr<const Line> NextLine(int max_width) override
|
||||
{
|
||||
icu::ParagraphLayout::Line *l = p->nextLine(max_width);
|
||||
return std::unique_ptr<const Line>(l == nullptr ? nullptr : new ICULine(l));
|
||||
}
|
||||
};
|
||||
|
||||
/* static */ ParagraphLayouter *ICUParagraphLayoutFactory::GetParagraphLayout(UChar *buff, UChar *buff_end, FontMap &fontMapping)
|
||||
{
|
||||
int32 length = buff_end - buff;
|
||||
|
||||
if (length == 0) {
|
||||
/* ICU's ParagraphLayout cannot handle empty strings, so fake one. */
|
||||
buff[0] = ' ';
|
||||
length = 1;
|
||||
fontMapping.back().first++;
|
||||
}
|
||||
|
||||
/* Fill ICU's FontRuns with the right data. */
|
||||
icu::FontRuns runs(fontMapping.size());
|
||||
for (auto &pair : fontMapping) {
|
||||
runs.add(pair.second, pair.first);
|
||||
}
|
||||
|
||||
LEErrorCode status = LE_NO_ERROR;
|
||||
/* ParagraphLayout does not copy "buff", so it must stay valid.
|
||||
* "runs" is copied according to the ICU source, but the documentation does not specify anything, so this might break somewhen. */
|
||||
icu::ParagraphLayout *p = new icu::ParagraphLayout(buff, length, &runs, nullptr, nullptr, nullptr, _current_text_dir == TD_RTL ? 1 : 0, false, status);
|
||||
if (status != LE_NO_ERROR) {
|
||||
delete p;
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
return new ICUParagraphLayout(p);
|
||||
}
|
||||
|
||||
/* static */ size_t ICUParagraphLayoutFactory::AppendToBuffer(UChar *buff, const UChar *buffer_last, WChar c)
|
||||
{
|
||||
/* Transform from UTF-32 to internal ICU format of UTF-16. */
|
||||
int32 length = 0;
|
||||
UErrorCode err = U_ZERO_ERROR;
|
||||
u_strFromUTF32(buff, buffer_last - buff, &length, (UChar32*)&c, 1, &err);
|
||||
return length;
|
||||
}
|
||||
@ -0,0 +1,30 @@
|
||||
/*
|
||||
* This file is part of OpenTTD.
|
||||
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
|
||||
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
/** @file gfx_layout_icu.h Functions related to laying out the texts with ICU. */
|
||||
|
||||
#ifndef GFX_LAYOUT_ICU_H
|
||||
#define GFX_LAYOUT_ICU_H
|
||||
|
||||
#include "gfx_layout.h"
|
||||
#include <unicode/ustring.h>
|
||||
|
||||
/**
|
||||
* Helper class to construct a new #ICUParagraphLayout.
|
||||
*/
|
||||
class ICUParagraphLayoutFactory {
|
||||
public:
|
||||
/** Helper for GetLayouter, to get the right type. */
|
||||
typedef UChar CharType;
|
||||
/** Helper for GetLayouter, to get whether the layouter supports RTL. */
|
||||
static const bool SUPPORTS_RTL = true;
|
||||
|
||||
static ParagraphLayouter *GetParagraphLayout(UChar *buff, UChar *buff_end, FontMap &fontMapping);
|
||||
static size_t AppendToBuffer(UChar *buff, const UChar *buffer_last, WChar c);
|
||||
};
|
||||
|
||||
#endif /* GFX_LAYOUT_ICU_H */
|
||||
Loading…
Reference in New Issue