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Location: cpp/openttd-patchpack/source/src/os/windows/string_uniscribe.cpp
r24803:d9506734523b
21.4 KiB
text/x-c
Codechange: turn a constant variable into a real constant.
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* 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 string_uniscribe.cpp Functions related to laying out text on Win32. */
#include "../../stdafx.h"
#include "../../debug.h"
#include "string_uniscribe.h"
#include "../../language.h"
#include "../../strings_func.h"
#include "../../string_func.h"
#include "../../table/control_codes.h"
#include "win32.h"
#include <vector>
#include <windows.h>
#include <usp10.h>
#include "../../safeguards.h"
#ifdef _MSC_VER
# pragma comment(lib, "usp10")
#endif
/** Uniscribe cache for internal font information, cleared when OTTD changes fonts. */
static SCRIPT_CACHE _script_cache[FS_END];
/**
* Contains all information about a run of characters. A run are consecutive
* characters that share a single font and language.
*/
struct UniscribeRun {
int pos;
int len;
Font *font;
std::vector<GlyphID> ft_glyphs;
SCRIPT_ANALYSIS sa;
std::vector<WORD> char_to_glyph;
std::vector<SCRIPT_VISATTR> vis_attribs;
std::vector<WORD> glyphs;
std::vector<int> advances;
std::vector<GOFFSET> offsets;
int total_advance;
UniscribeRun(int pos, int len, Font *font, SCRIPT_ANALYSIS &sa) : pos(pos), len(len), font(font), sa(sa) {}
};
/** Break a string into language formatting ranges. */
static std::vector<SCRIPT_ITEM> UniscribeItemizeString(UniscribeParagraphLayoutFactory::CharType *buff, int32 length);
/** Generate and place glyphs for a run of characters. */
static bool UniscribeShapeRun(const UniscribeParagraphLayoutFactory::CharType *buff, UniscribeRun &range);
/**
* Wrapper for doing layouts with Uniscribe.
*/
class UniscribeParagraphLayout : public ParagraphLayouter {
private:
const UniscribeParagraphLayoutFactory::CharType *text_buffer;
std::vector<UniscribeRun> ranges; ///< All runs of the text.
std::vector<UniscribeRun>::iterator cur_range; ///< The next run to be output.
int cur_range_offset = 0; ///< Offset from the start of the current run from where to output.
public:
/** Visual run contains data about the bit of text with the same font. */
class UniscribeVisualRun : public ParagraphLayouter::VisualRun {
private:
std::vector<GlyphID> glyphs;
std::vector<float> positions;
std::vector<WORD> char_to_glyph;
int start_pos;
int total_advance;
int num_glyphs;
Font *font;
mutable int *glyph_to_char = nullptr;
public:
UniscribeVisualRun(const UniscribeRun &range, int x);
UniscribeVisualRun(UniscribeVisualRun &&other) noexcept;
~UniscribeVisualRun() override
{
free(this->glyph_to_char);
}
const GlyphID *GetGlyphs() const override { return &this->glyphs[0]; }
const float *GetPositions() const override { return &this->positions[0]; }
const int *GetGlyphToCharMap() const override;
const Font *GetFont() const override { return this->font; }
int GetLeading() const override { return this->font->fc->GetHeight(); }
int GetGlyphCount() const override { return this->num_glyphs; }
int GetAdvance() const { return this->total_advance; }
};
/** A single line worth of VisualRuns. */
class UniscribeLine : public std::vector<UniscribeVisualRun>, public ParagraphLayouter::Line {
public:
int GetLeading() const override;
int GetWidth() const override;
int CountRuns() const override { return (uint)this->size(); }
const VisualRun &GetVisualRun(int run) const override { return this->at(run); }
int GetInternalCharLength(WChar c) const override
{
/* Uniscribe uses UTF-16 internally which means we need to account for surrogate pairs. */
return c >= 0x010000U ? 2 : 1;
}
};
UniscribeParagraphLayout(std::vector<UniscribeRun> &ranges, const UniscribeParagraphLayoutFactory::CharType *buffer) : text_buffer(buffer), ranges(ranges)
{
this->Reflow();
}
~UniscribeParagraphLayout() override {}
void Reflow() override
{
this->cur_range = this->ranges.begin();
this->cur_range_offset = 0;
}
std::unique_ptr<const Line> NextLine(int max_width) override;
};
void UniscribeResetScriptCache(FontSize size)
{
if (_script_cache[size] != nullptr) {
ScriptFreeCache(&_script_cache[size]);
_script_cache[size] = nullptr;
}
}
/** Load the matching native Windows font. */
static HFONT HFontFromFont(Font *font)
{
if (font->fc->GetOSHandle() != nullptr) return CreateFontIndirect((const PLOGFONT)font->fc->GetOSHandle());
LOGFONT logfont;
ZeroMemory(&logfont, sizeof(LOGFONT));
logfont.lfHeight = font->fc->GetHeight();
logfont.lfWeight = FW_NORMAL;
logfont.lfCharSet = DEFAULT_CHARSET;
convert_to_fs(font->fc->GetFontName(), logfont.lfFaceName, lengthof(logfont.lfFaceName));
return CreateFontIndirect(&logfont);
}
/** Determine the glyph positions for a run. */
static bool UniscribeShapeRun(const UniscribeParagraphLayoutFactory::CharType *buff, UniscribeRun &range)
{
/* Initial size guess for the number of glyphs recommended by Uniscribe. */
range.glyphs.resize(range.len * 3 / 2 + 16);
range.vis_attribs.resize(range.glyphs.size());
/* The char-to-glyph array is the same size as the input. */
range.char_to_glyph.resize(range.len);
HDC temp_dc = nullptr;
HFONT old_font = nullptr;
HFONT cur_font = nullptr;
while (true) {
/* Shape the text run by determining the glyphs needed for display. */
int glyphs_used = 0;
HRESULT hr = ScriptShape(temp_dc, &_script_cache[range.font->fc->GetSize()], buff + range.pos, range.len, (int)range.glyphs.size(), &range.sa, &range.glyphs[0], &range.char_to_glyph[0], &range.vis_attribs[0], &glyphs_used);
if (SUCCEEDED(hr)) {
range.glyphs.resize(glyphs_used);
range.vis_attribs.resize(glyphs_used);
/* Calculate the glyph positions. */
ABC abc;
range.advances.resize(range.glyphs.size());
range.offsets.resize(range.glyphs.size());
hr = ScriptPlace(temp_dc, &_script_cache[range.font->fc->GetSize()], &range.glyphs[0], (int)range.glyphs.size(), &range.vis_attribs[0], &range.sa, &range.advances[0], &range.offsets[0], &abc);
if (SUCCEEDED(hr)) {
/* We map our special sprite chars to values that don't fit into a WORD. Copy the glyphs
* into a new vector and query the real glyph to use for these special chars. */
range.ft_glyphs.resize(range.glyphs.size());
for (size_t g_id = 0; g_id < range.glyphs.size(); g_id++) {
range.ft_glyphs[g_id] = range.glyphs[g_id];
}
for (int i = 0; i < range.len; i++) {
if (buff[range.pos + i] >= SCC_SPRITE_START && buff[range.pos + i] <= SCC_SPRITE_END) {
auto pos = range.char_to_glyph[i];
range.ft_glyphs[pos] = range.font->fc->MapCharToGlyph(buff[range.pos + i]);
range.offsets[pos].dv = range.font->fc->GetAscender() - range.font->fc->GetGlyph(range.ft_glyphs[pos])->height - 1; // Align sprite glyphs to font baseline.
range.advances[pos] = range.font->fc->GetGlyphWidth(range.ft_glyphs[pos]);
}
}
range.total_advance = 0;
for (size_t i = 0; i < range.advances.size(); i++) {
#ifdef WITH_FREETYPE
/* FreeType and GDI/Uniscribe seems to occasionally disagree over the width of a glyph. */
if (range.advances[i] > 0 && range.ft_glyphs[i] != 0xFFFF) range.advances[i] = range.font->fc->GetGlyphWidth(range.ft_glyphs[i]);
#endif
range.total_advance += range.advances[i];
}
break;
}
}
if (hr == E_OUTOFMEMORY) {
/* The glyph buffer needs to be larger. Just double it every time. */
range.glyphs.resize(range.glyphs.size() * 2);
range.vis_attribs.resize(range.vis_attribs.size() * 2);
} else if (hr == E_PENDING) {
/* Glyph data is not in cache, load native font. */
cur_font = HFontFromFont(range.font);
if (cur_font == nullptr) return false; // Sorry, no dice.
temp_dc = CreateCompatibleDC(nullptr);
SetMapMode(temp_dc, MM_TEXT);
old_font = (HFONT)SelectObject(temp_dc, cur_font);
} else if (hr == USP_E_SCRIPT_NOT_IN_FONT && range.sa.eScript != SCRIPT_UNDEFINED) {
/* Try again with the generic shaping engine. */
range.sa.eScript = SCRIPT_UNDEFINED;
} else {
/* Some unknown other error. */
if (temp_dc != nullptr) {
SelectObject(temp_dc, old_font);
DeleteObject(cur_font);
ReleaseDC(nullptr, temp_dc);
}
return false;
}
}
if (temp_dc != nullptr) {
SelectObject(temp_dc, old_font);
DeleteObject(cur_font);
ReleaseDC(nullptr, temp_dc);
}
return true;
}
static std::vector<SCRIPT_ITEM> UniscribeItemizeString(UniscribeParagraphLayoutFactory::CharType *buff, int32 length)
{
/* Itemize text. */
SCRIPT_CONTROL control;
ZeroMemory(&control, sizeof(SCRIPT_CONTROL));
control.uDefaultLanguage = _current_language->winlangid;
SCRIPT_STATE state;
ZeroMemory(&state, sizeof(SCRIPT_STATE));
state.uBidiLevel = _current_text_dir == TD_RTL ? 1 : 0;
std::vector<SCRIPT_ITEM> items(16);
while (true) {
/* We subtract one from max_items to work around a buffer overflow on some older versions of Windows. */
int generated = 0;
HRESULT hr = ScriptItemize(buff, length, (int)items.size() - 1, &control, &state, &items[0], &generated);
if (SUCCEEDED(hr)) {
/* Resize the item buffer. Note that Uniscribe will always add an additional end sentinel item. */
items.resize(generated + 1);
break;
}
/* Some kind of error except item buffer too small. */
if (hr != E_OUTOFMEMORY) return std::vector<SCRIPT_ITEM>();
items.resize(items.size() * 2);
}
return items;
}
/* static */ ParagraphLayouter *UniscribeParagraphLayoutFactory::GetParagraphLayout(CharType *buff, CharType *buff_end, FontMap &fontMapping)
{
int32 length = buff_end - buff;
/* Can't layout an empty string. */
if (length == 0) return nullptr;
/* Can't layout our in-built sprite fonts. */
for (auto const &pair : fontMapping) {
if (pair.second->fc->IsBuiltInFont()) return nullptr;
}
/* Itemize text. */
std::vector<SCRIPT_ITEM> items = UniscribeItemizeString(buff, length);
if (items.size() == 0) return nullptr;
/* Build ranges from the items and the font map. A range is a run of text
* that is part of a single item and formatted using a single font style. */
std::vector<UniscribeRun> ranges;
int cur_pos = 0;
std::vector<SCRIPT_ITEM>::iterator cur_item = items.begin();
for (auto const &i : fontMapping) {
while (cur_pos < i.first && cur_item != items.end() - 1) {
/* Add a range that spans the intersection of the remaining item and font run. */
int stop_pos = std::min(i.first, (cur_item + 1)->iCharPos);
assert(stop_pos - cur_pos > 0);
ranges.push_back(UniscribeRun(cur_pos, stop_pos - cur_pos, i.second, cur_item->a));
/* Shape the range. */
if (!UniscribeShapeRun(buff, ranges.back())) {
return nullptr;
}
/* If we are at the end of the current item, advance to the next item. */
if (stop_pos == (cur_item + 1)->iCharPos) cur_item++;
cur_pos = stop_pos;
}
}
return new UniscribeParagraphLayout(ranges, buff);
}
/* virtual */ std::unique_ptr<const ParagraphLayouter::Line> UniscribeParagraphLayout::NextLine(int max_width)
{
std::vector<UniscribeRun>::iterator start_run = this->cur_range;
std::vector<UniscribeRun>::iterator last_run = this->cur_range;
if (start_run == this->ranges.end()) return nullptr;
/* Add remaining width of the first run if it is a broken run. */
int cur_width = 0;
if (this->cur_range_offset != 0) {
std::vector<int> dx(start_run->len);
ScriptGetLogicalWidths(&start_run->sa, start_run->len, (int)start_run->glyphs.size(), &start_run->advances[0], &start_run->char_to_glyph[0], &start_run->vis_attribs[0], &dx[0]);
for (std::vector<int>::const_iterator c = dx.begin() + this->cur_range_offset; c != dx.end(); c++) {
cur_width += *c;
}
++last_run;
}
/* Gather runs until the line is full. */
while (last_run != this->ranges.end() && cur_width < max_width) {
cur_width += last_run->total_advance;
++last_run;
}
/* If the text does not fit into the available width, find a suitable breaking point. */
int remaing_offset = (last_run - 1)->len;
if (cur_width > max_width) {
std::vector<SCRIPT_LOGATTR> log_attribs;
/* Get word break information. */
int width_avail = max_width;
int num_chars = this->cur_range_offset;
int start_offs = this->cur_range_offset;
int last_cluster = this->cur_range_offset + 1;
for (std::vector<UniscribeRun>::iterator r = start_run; r != last_run; r++) {
log_attribs.resize(r->pos - start_run->pos + r->len);
if (FAILED(ScriptBreak(this->text_buffer + r->pos + start_offs, r->len - start_offs, &r->sa, &log_attribs[r->pos - start_run->pos + start_offs]))) return nullptr;
std::vector<int> dx(r->len);
ScriptGetLogicalWidths(&r->sa, r->len, (int)r->glyphs.size(), &r->advances[0], &r->char_to_glyph[0], &r->vis_attribs[0], &dx[0]);
/* Count absolute max character count on the line. */
for (int c = start_offs; c < r->len && width_avail > 0; c++, num_chars++) {
if (c > start_offs && log_attribs[num_chars].fCharStop) last_cluster = num_chars;
width_avail -= dx[c];
}
start_offs = 0;
}
/* Walk backwards to find the last suitable breaking point. */
while (--num_chars > this->cur_range_offset && !log_attribs[num_chars].fSoftBreak && !log_attribs[num_chars].fWhiteSpace) {}
if (num_chars == this->cur_range_offset) {
/* Didn't find any suitable word break point, just break on the last cluster boundary. */
num_chars = last_cluster;
}
/* Include whitespace characters after the breaking point. */
while (num_chars < (int)log_attribs.size() && log_attribs[num_chars].fWhiteSpace) {
num_chars++;
}
/* Get last run that corresponds to the number of characters to show. */
for (std::vector<UniscribeRun>::iterator run = start_run; run != last_run; run++) {
num_chars -= run->len;
if (num_chars <= 0) {
remaing_offset = num_chars + run->len + 1;
last_run = run + 1;
assert(remaing_offset - 1 > 0);
break;
}
}
}
/* Build display order from the runs. */
std::vector<BYTE> bidi_level;
for (std::vector<UniscribeRun>::iterator r = start_run; r != last_run; r++) {
bidi_level.push_back(r->sa.s.uBidiLevel);
}
std::vector<INT> vis_to_log(bidi_level.size());
if (FAILED(ScriptLayout((int)bidi_level.size(), &bidi_level[0], &vis_to_log[0], nullptr))) return nullptr;
/* Create line. */
std::unique_ptr<UniscribeLine> line(new UniscribeLine());
int cur_pos = 0;
for (std::vector<INT>::iterator l = vis_to_log.begin(); l != vis_to_log.end(); l++) {
std::vector<UniscribeRun>::iterator i_run = start_run + *l;
UniscribeRun run = *i_run;
/* Partial run after line break (either start or end)? Reshape run to get the first/last glyphs right. */
if (i_run == last_run - 1 && remaing_offset < (last_run - 1)->len) {
run.len = remaing_offset - 1;
if (!UniscribeShapeRun(this->text_buffer, run)) return nullptr;
}
if (i_run == start_run && this->cur_range_offset > 0) {
assert(run.len - this->cur_range_offset > 0);
run.pos += this->cur_range_offset;
run.len -= this->cur_range_offset;
if (!UniscribeShapeRun(this->text_buffer, run)) return nullptr;
}
line->emplace_back(run, cur_pos);
cur_pos += run.total_advance;
}
if (remaing_offset < (last_run - 1)->len) {
/* We didn't use up all of the last run, store remainder for the next line. */
this->cur_range_offset = remaing_offset - 1;
this->cur_range = last_run - 1;
assert(this->cur_range->len > this->cur_range_offset);
} else {
this->cur_range_offset = 0;
this->cur_range = last_run;
}
return line;
}
/**
* Get the height of the line.
* @return The maximum height of the line.
*/
int UniscribeParagraphLayout::UniscribeLine::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 UniscribeParagraphLayout::UniscribeLine::GetWidth() const
{
int length = 0;
for (const auto &run : *this) {
length += run.GetAdvance();
}
return length;
}
UniscribeParagraphLayout::UniscribeVisualRun::UniscribeVisualRun(const UniscribeRun &range, int x) : glyphs(range.ft_glyphs), char_to_glyph(range.char_to_glyph), start_pos(range.pos), total_advance(range.total_advance), font(range.font)
{
this->num_glyphs = (int)glyphs.size();
this->positions.resize(this->num_glyphs * 2 + 2);
int advance = 0;
for (int i = 0; i < this->num_glyphs; i++) {
this->positions[i * 2 + 0] = range.offsets[i].du + advance + x;
this->positions[i * 2 + 1] = range.offsets[i].dv;
advance += range.advances[i];
}
this->positions[this->num_glyphs * 2] = advance + x;
}
UniscribeParagraphLayout::UniscribeVisualRun::UniscribeVisualRun(UniscribeVisualRun&& other) noexcept
: glyphs(std::move(other.glyphs)), positions(std::move(other.positions)), char_to_glyph(std::move(other.char_to_glyph)),
start_pos(other.start_pos), total_advance(other.total_advance), num_glyphs(other.num_glyphs), font(other.font)
{
this->glyph_to_char = other.glyph_to_char;
other.glyph_to_char = nullptr;
}
const int *UniscribeParagraphLayout::UniscribeVisualRun::GetGlyphToCharMap() const
{
if (this->glyph_to_char == nullptr) {
this->glyph_to_char = CallocT<int>(this->GetGlyphCount());
/* The char to glyph array contains the first glyph index of the cluster that is associated
* with each character. It is possible for a cluster to be formed of several chars. */
for (int c = 0; c < (int)this->char_to_glyph.size(); c++) {
/* If multiple chars map to one glyph, only refer back to the first character. */
if (this->glyph_to_char[this->char_to_glyph[c]] == 0) this->glyph_to_char[this->char_to_glyph[c]] = c + this->start_pos;
}
/* We only marked the first glyph of each cluster in the loop above. Fill the gaps. */
int last_char = this->glyph_to_char[0];
for (int g = 0; g < this->GetGlyphCount(); g++) {
if (this->glyph_to_char[g] != 0) last_char = this->glyph_to_char[g];
this->glyph_to_char[g] = last_char;
}
}
return this->glyph_to_char;
}
/* virtual */ void UniscribeStringIterator::SetString(const char *s)
{
const char *string_base = s;
this->utf16_to_utf8.clear();
this->str_info.clear();
this->cur_pos = 0;
/* Uniscribe operates on UTF-16, thus we have to convert the input string.
* To be able to return proper offsets, we have to create a mapping at the same time. */
std::vector<wchar_t> utf16_str; ///< UTF-16 copy of the string.
while (*s != '\0') {
size_t idx = s - string_base;
WChar c = Utf8Consume(&s);
if (c < 0x10000) {
utf16_str.push_back((wchar_t)c);
} else {
/* Make a surrogate pair. */
utf16_str.push_back((wchar_t)(0xD800 + ((c - 0x10000) >> 10)));
utf16_str.push_back((wchar_t)(0xDC00 + ((c - 0x10000) & 0x3FF)));
this->utf16_to_utf8.push_back(idx);
}
this->utf16_to_utf8.push_back(idx);
}
this->utf16_to_utf8.push_back(s - string_base);
/* Query Uniscribe for word and cluster break information. */
this->str_info.resize(utf16_to_utf8.size());
if (utf16_str.size() > 0) {
/* Itemize string into language runs. */
std::vector<SCRIPT_ITEM> runs = UniscribeItemizeString(&utf16_str[0], (int32)utf16_str.size());
for (std::vector<SCRIPT_ITEM>::const_iterator run = runs.begin(); runs.size() > 0 && run != runs.end() - 1; run++) {
/* Get information on valid word and character break.s */
int len = (run + 1)->iCharPos - run->iCharPos;
std::vector<SCRIPT_LOGATTR> attr(len);
ScriptBreak(&utf16_str[run->iCharPos], len, &run->a, &attr[0]);
/* Extract the information we're interested in. */
for (size_t c = 0; c < attr.size(); c++) {
/* First character of a run is always a valid word break. */
this->str_info[c + run->iCharPos].word_stop = attr[c].fWordStop || c == 0;
this->str_info[c + run->iCharPos].char_stop = attr[c].fCharStop;
}
}
}
/* End-of-string is always a valid stopping point. */
this->str_info.back().char_stop = true;
this->str_info.back().word_stop = true;
}
/* virtual */ size_t UniscribeStringIterator::SetCurPosition(size_t pos)
{
/* Convert incoming position to an UTF-16 string index. */
size_t utf16_pos = 0;
for (size_t i = 0; i < this->utf16_to_utf8.size(); i++) {
if (this->utf16_to_utf8[i] == pos) {
utf16_pos = i;
break;
}
}
/* Sanitize in case we get a position inside a grapheme cluster. */
while (utf16_pos > 0 && !this->str_info[utf16_pos].char_stop) utf16_pos--;
this->cur_pos = utf16_pos;
return this->utf16_to_utf8[this->cur_pos];
}
/* virtual */ size_t UniscribeStringIterator::Next(IterType what)
{
assert(this->cur_pos <= this->utf16_to_utf8.size());
assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);
if (this->cur_pos == this->utf16_to_utf8.size()) return END;
do {
this->cur_pos++;
} while (this->cur_pos < this->utf16_to_utf8.size() && (what == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));
return this->cur_pos == this->utf16_to_utf8.size() ? END : this->utf16_to_utf8[this->cur_pos];
}
/*virtual */ size_t UniscribeStringIterator::Prev(IterType what)
{
assert(this->cur_pos <= this->utf16_to_utf8.size());
assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);
if (this->cur_pos == 0) return END;
do {
this->cur_pos--;
} while (this->cur_pos > 0 && (what == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));
return this->utf16_to_utf8[this->cur_pos];
}
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