Files
@ r27266:57086da699c4
Branch filter:
Location: cpp/openttd-patchpack/source/src/gfx_layout_fallback.cpp
r27266:57086da699c4
11.4 KiB
text/x-c
Fix: [Win32] Text line breaking did not properly handle punctuation characters. (#10775)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 | /*
* 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_fallback.cpp Handling of laying out text as fallback. */
#include "stdafx.h"
#include "gfx_layout_fallback.h"
#include "string_func.h"
#include "zoom_func.h"
#include "table/control_codes.h"
#include "safeguards.h"
/*** Paragraph layout ***/
/**
* Class handling the splitting of a paragraph of text into lines and
* visual runs.
*
* One constructs this class with the text that needs to be split into
* lines. Then nextLine is called with the maximum width until nullptr is
* returned. Each nextLine call creates VisualRuns which contain the
* length of text that are to be drawn with the same font. In other
* words, the result of this class is a list of sub strings with their
* font. The sub strings are then already fully laid out, and only
* need actual drawing.
*
* The positions in a visual run are sequential pairs of X,Y of the
* begin of each of the glyphs plus an extra pair to mark the end.
*
* @note This variant does not handle right-to-left properly.
*/
class FallbackParagraphLayout : public ParagraphLayouter {
public:
/** Visual run contains data about the bit of text with the same font. */
class FallbackVisualRun : public ParagraphLayouter::VisualRun {
Font *font; ///< The font used to layout these.
GlyphID *glyphs; ///< The glyphs we're drawing.
float *positions; ///< The positions of the glyphs.
int *glyph_to_char; ///< The char index of the glyphs.
int glyph_count; ///< The number of glyphs.
public:
FallbackVisualRun(Font *font, const WChar *chars, int glyph_count, int x);
FallbackVisualRun(FallbackVisualRun &&other) noexcept;
~FallbackVisualRun() override;
const Font *GetFont() const override;
int GetGlyphCount() const override;
const GlyphID *GetGlyphs() const override;
const float *GetPositions() const override;
int GetLeading() const override;
const int *GetGlyphToCharMap() const override;
};
/** A single line worth of VisualRuns. */
class FallbackLine : public std::vector<FallbackVisualRun>, public ParagraphLayouter::Line {
public:
int GetLeading() const override;
int GetWidth() const override;
int CountRuns() const override;
const ParagraphLayouter::VisualRun &GetVisualRun(int run) const override;
int GetInternalCharLength(WChar c) const override { return 1; }
};
const WChar *buffer_begin; ///< Begin of the buffer.
const WChar *buffer; ///< The current location in the buffer.
FontMap &runs; ///< The fonts we have to use for this paragraph.
FallbackParagraphLayout(WChar *buffer, int length, FontMap &runs);
void Reflow() override;
std::unique_ptr<const Line> NextLine(int max_width) override;
};
/**
* Get the actual ParagraphLayout for the given buffer.
* @param buff The begin of the buffer.
* @param buff_end The location after the last element in the buffer.
* @param fontMapping THe mapping of the fonts.
* @return The ParagraphLayout instance.
*/
/* static */ ParagraphLayouter *FallbackParagraphLayoutFactory::GetParagraphLayout(WChar *buff, WChar *buff_end, FontMap &fontMapping)
{
return new FallbackParagraphLayout(buff, buff_end - buff, fontMapping);
}
/**
* Append a wide character to the internal buffer.
* @param buff The buffer to append to.
* @param buffer_last The end of the buffer.
* @param c The character to add.
* @return The number of buffer spaces that were used.
*/
/* static */ size_t FallbackParagraphLayoutFactory::AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c)
{
*buff = c;
return 1;
}
/**
* Create the visual run.
* @param font The font to use for this run.
* @param chars The characters to use for this run.
* @param char_count The number of characters in this run.
* @param x The initial x position for this run.
*/
FallbackParagraphLayout::FallbackVisualRun::FallbackVisualRun(Font *font, const WChar *chars, int char_count, int x) :
font(font), glyph_count(char_count)
{
const bool isbuiltin = font->fc->IsBuiltInFont();
this->glyphs = MallocT<GlyphID>(this->glyph_count);
this->glyph_to_char = MallocT<int>(this->glyph_count);
/* Positions contains the location of the begin of each of the glyphs, and the end of the last one. */
this->positions = MallocT<float>(this->glyph_count * 2 + 2);
this->positions[0] = x;
for (int i = 0; i < this->glyph_count; i++) {
this->glyphs[i] = font->fc->MapCharToGlyph(chars[i]);
if (isbuiltin) {
this->positions[2 * i + 1] = font->fc->GetAscender(); // Apply sprite font's ascender.
} else if (chars[i] >= SCC_SPRITE_START && chars[i] <= SCC_SPRITE_END) {
this->positions[2 * i + 1] = (font->fc->GetHeight() - ScaleSpriteTrad(FontCache::GetDefaultFontHeight(font->fc->GetSize()))) / 2; // Align sprite font to centre
} else {
this->positions[2 * i + 1] = 0; // No ascender adjustment.
}
this->positions[2 * i + 2] = this->positions[2 * i] + font->fc->GetGlyphWidth(this->glyphs[i]);
this->glyph_to_char[i] = i;
}
}
/** Move constructor for visual runs.*/
FallbackParagraphLayout::FallbackVisualRun::FallbackVisualRun(FallbackVisualRun &&other) noexcept : font(other.font), glyph_count(other.glyph_count)
{
this->positions = other.positions;
this->glyph_to_char = other.glyph_to_char;
this->glyphs = other.glyphs;
other.positions = nullptr;
other.glyph_to_char = nullptr;
other.glyphs = nullptr;
}
/** Free all data. */
FallbackParagraphLayout::FallbackVisualRun::~FallbackVisualRun()
{
free(this->positions);
free(this->glyph_to_char);
free(this->glyphs);
}
/**
* Get the font associated with this run.
* @return The font.
*/
const Font *FallbackParagraphLayout::FallbackVisualRun::GetFont() const
{
return this->font;
}
/**
* Get the number of glyphs in this run.
* @return The number of glyphs.
*/
int FallbackParagraphLayout::FallbackVisualRun::GetGlyphCount() const
{
return this->glyph_count;
}
/**
* Get the glyphs of this run.
* @return The glyphs.
*/
const GlyphID *FallbackParagraphLayout::FallbackVisualRun::GetGlyphs() const
{
return this->glyphs;
}
/**
* Get the positions of this run.
* @return The positions.
*/
const float *FallbackParagraphLayout::FallbackVisualRun::GetPositions() const
{
return this->positions;
}
/**
* Get the glyph-to-character map for this visual run.
* @return The glyph-to-character map.
*/
const int *FallbackParagraphLayout::FallbackVisualRun::GetGlyphToCharMap() const
{
return this->glyph_to_char;
}
/**
* Get the height of this font.
* @return The height of the font.
*/
int FallbackParagraphLayout::FallbackVisualRun::GetLeading() const
{
return this->GetFont()->fc->GetHeight();
}
/**
* Get the height of the line.
* @return The maximum height of the line.
*/
int FallbackParagraphLayout::FallbackLine::GetLeading() const
{
int leading = 0;
for (const auto &run : *this) {
leading = std::max(leading, run.GetLeading());
}
return leading;
}
/**
* Get the width of this line.
* @return The width of the line.
*/
int FallbackParagraphLayout::FallbackLine::GetWidth() const
{
if (this->size() == 0) return 0;
/*
* The last X position of a run contains is the end of that run.
* Since there is no left-to-right support, taking this value of
* the last run gives us the end of the line and thus the width.
*/
const auto &run = this->GetVisualRun(this->CountRuns() - 1);
return (int)run.GetPositions()[run.GetGlyphCount() * 2];
}
/**
* Get the number of runs in this line.
* @return The number of runs.
*/
int FallbackParagraphLayout::FallbackLine::CountRuns() const
{
return (uint)this->size();
}
/**
* Get a specific visual run.
* @return The visual run.
*/
const ParagraphLayouter::VisualRun &FallbackParagraphLayout::FallbackLine::GetVisualRun(int run) const
{
return this->at(run);
}
/**
* Create a new paragraph layouter.
* @param buffer The characters of the paragraph.
* @param length The length of the paragraph.
* @param runs The font mapping of this paragraph.
*/
FallbackParagraphLayout::FallbackParagraphLayout(WChar *buffer, int length, FontMap &runs) : buffer_begin(buffer), buffer(buffer), runs(runs)
{
assert(runs.End()[-1].first == length);
}
/**
* Reset the position to the start of the paragraph.
*/
void FallbackParagraphLayout::Reflow()
{
this->buffer = this->buffer_begin;
}
/**
* Construct a new line with a maximum width.
* @param max_width The maximum width of the string.
* @return A Line, or nullptr when at the end of the paragraph.
*/
std::unique_ptr<const ParagraphLayouter::Line> FallbackParagraphLayout::NextLine(int max_width)
{
/* Simple idea:
* - split a line at a newline character, or at a space where we can break a line.
* - split for a visual run whenever a new line happens, or the font changes.
*/
if (this->buffer == nullptr) return nullptr;
std::unique_ptr<FallbackLine> l(new FallbackLine());
if (*this->buffer == '\0') {
/* Only a newline. */
this->buffer = nullptr;
l->emplace_back(this->runs.front().second, this->buffer, 0, 0);
return l;
}
int offset = this->buffer - this->buffer_begin;
FontMap::iterator iter = this->runs.data();
while (iter->first <= offset) {
iter++;
assert(iter != this->runs.End());
}
const FontCache *fc = iter->second->fc;
const WChar *next_run = this->buffer_begin + iter->first;
const WChar *begin = this->buffer;
const WChar *last_space = nullptr;
const WChar *last_char;
int width = 0;
for (;;) {
WChar c = *this->buffer;
last_char = this->buffer;
if (c == '\0') {
this->buffer = nullptr;
break;
}
if (this->buffer == next_run) {
int w = l->GetWidth();
l->emplace_back(iter->second, begin, this->buffer - begin, w);
iter++;
assert(iter != this->runs.End());
next_run = this->buffer_begin + iter->first;
begin = this->buffer;
}
if (IsWhitespace(c)) last_space = this->buffer;
if (IsPrintable(c) && !IsTextDirectionChar(c)) {
int char_width = GetCharacterWidth(fc->GetSize(), c);
width += char_width;
if (width > max_width) {
/* The string is longer than maximum width so we need to decide
* what to do with it. */
if (width == char_width) {
/* The character is wider than allowed width; don't know
* what to do with this case... bail out! */
this->buffer = nullptr;
return l;
}
if (last_space == nullptr) {
/* No space has been found. Just terminate at our current
* location. This usually happens for languages that do not
* require spaces in strings, like Chinese, Japanese and
* Korean. For other languages terminating mid-word might
* not be the best, but terminating the whole string instead
* of continuing the word at the next line is worse. */
last_char = this->buffer;
} else {
/* A space is found; perfect place to terminate */
this->buffer = last_space + 1;
last_char = last_space;
}
break;
}
}
this->buffer++;
}
if (l->size() == 0 || last_char - begin > 0) {
int w = l->GetWidth();
l->emplace_back(iter->second, begin, last_char - begin, w);
}
return l;
}
|