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/* $Id$ */
/*
* 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.cpp Handling of laying out text. */
#include "stdafx.h"
#include "gfx_layout.h"
#include "string_func.h"
#include "strings_func.h"
#include "table/control_codes.h"
#ifdef WITH_ICU
#include <unicode/ustring.h>
#endif /* WITH_ICU */
/**
* Construct a new font.
* @param size The font size to use for this font.
* @param colour The colour to draw this font in.
*/
Font::Font(FontSize size, TextColour colour) :
fc(FontCache::Get(size)), colour(colour)
{
assert(size < FS_END);
}
#ifdef WITH_ICU
/* Implementation details of LEFontInstance */
le_int32 Font::getUnitsPerEM() const
{
return this->fc->GetUnitsPerEM();
}
le_int32 Font::getAscent() const
{
return this->fc->GetAscender();
}
le_int32 Font::getDescent() const
{
return -this->fc->GetDescender();
}
le_int32 Font::getLeading() const
{
return this->fc->GetHeight();
}
float Font::getXPixelsPerEm() const
{
return (float)this->fc->GetHeight();
}
float Font::getYPixelsPerEm() const
{
return (float)this->fc->GetHeight();
}
float Font::getScaleFactorX() const
{
return 1.0f;
}
float Font::getScaleFactorY() const
{
return 1.0f;
}
const void *Font::getFontTable(LETag tableTag) const
{
return this->fc->GetFontTable(tableTag);
}
LEGlyphID Font::mapCharToGlyph(LEUnicode32 ch) const
{
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;
}
size_t Layouter::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;
}
ParagraphLayout *Layouter::GetParagraphLayout(UChar *buff)
{
int32 length = buff - this->buffer;
if (length == 0) {
/* ICU's ParagraphLayout cannot handle empty strings, so fake one. */
this->buffer[0] = ' ';
length = 1;
this->fonts.End()[-1].first++;
}
/* Fill ICU's FontRuns with the right data. */
FontRuns runs(this->fonts.Length());
for (FontMap::iterator iter = this->fonts.Begin(); iter != this->fonts.End(); iter++) {
runs.add(iter->second, iter->first);
}
LEErrorCode status = LE_NO_ERROR;
return new ParagraphLayout(this->buffer, length, &runs, NULL, NULL, NULL, _current_text_dir == TD_RTL ? UBIDI_DEFAULT_RTL : UBIDI_DEFAULT_LTR, false, status);
}
#else /* WITH_ICU */
/*** Paragraph layout ***/
/**
* 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.
*/
ParagraphLayout::VisualRun::VisualRun(Font *font, const WChar *chars, int char_count, int x) :
font(font), glyph_count(char_count)
{
this->glyphs = MallocT<GlyphID>(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;
this->positions[1] = 0;
for (int i = 0; i < this->glyph_count; i++) {
this->glyphs[i] = font->fc->MapCharToGlyph(chars[i]);
this->positions[2 * i + 2] = this->positions[2 * i] + font->fc->GetGlyphWidth(this->glyphs[i]);
this->positions[2 * i + 3] = 0;
}
}
/** Free all data. */
ParagraphLayout::VisualRun::~VisualRun()
{
free(this->positions);
free(this->glyphs);
}
/**
* Get the font associated with this run.
* @return The font.
*/
Font *ParagraphLayout::VisualRun::getFont() const
{
return this->font;
}
/**
* Get the number of glyhps in this run.
* @return The number of glyphs.
*/
int ParagraphLayout::VisualRun::getGlyphCount() const
{
return this->glyph_count;
}
/**
* Get the glyhps of this run.
* @return The glyphs.
*/
const GlyphID *ParagraphLayout::VisualRun::getGlyphs() const
{
return this->glyphs;
}
/**
* Get the positions of this run.
* @return The positions.
*/
float *ParagraphLayout::VisualRun::getPositions() const
{
return this->positions;
}
/**
* Get the height of this font.
* @return The height of the font.
*/
int ParagraphLayout::VisualRun::getLeading() const
{
return this->getFont()->fc->GetHeight();
}
/**
* Get the height of the line.
* @return The maximum height of the line.
*/
int ParagraphLayout::Line::getLeading() const
{
int leading = 0;
for (const VisualRun * const *run = this->Begin(); run != this->End(); run++) {
leading = max(leading, (*run)->getLeading());
}
return leading;
}
/**
* Get the width of this line.
* @return The width of the line.
*/
int ParagraphLayout::Line::getWidth() const
{
if (this->Length() == 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 VisualRun *run = this->getVisualRun(this->countRuns() - 1);
return run->getPositions()[run->getGlyphCount() * 2];
}
/**
* Get the number of runs in this line.
* @return The number of runs.
*/
int ParagraphLayout::Line::countRuns() const
{
return this->Length();
}
/**
* Get a specific visual run.
* @return The visual run.
*/
ParagraphLayout::VisualRun *ParagraphLayout::Line::getVisualRun(int run) const
{
return *this->Get(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.
*/
ParagraphLayout::ParagraphLayout(WChar *buffer, int length, FontMap &runs) : buffer_begin(buffer), buffer(buffer), runs(runs)
{
assert(runs.End()[-1].first == length);
}
/**
* Construct a new line with a maximum width.
* @param max_width The maximum width of the string.
* @return A Line, or NULL when at the end of the paragraph.
*/
ParagraphLayout::Line *ParagraphLayout::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 == NULL|| *this->buffer == '\0') return NULL;
Line *l = new Line();
const WChar *begin = this->buffer;
WChar *last_space = NULL;
const WChar *last_char = begin;
int width = 0;
int offset = this->buffer - this->buffer_begin;
FontMap::iterator iter = runs.Begin();
while (iter->first <= offset) {
iter++;
assert(iter != runs.End());
}
const FontCache *fc = iter->second->fc;
const WChar *next_run = this->buffer_begin + iter->first + 1;
for (;;) {
WChar c = *this->buffer++;
if (c == '\0') {
this->buffer = NULL;
break;
}
if (c == '\n') break;
if (this->buffer == next_run) {
*l->Append() = new VisualRun(iter->second, begin, this->buffer - begin, l->getWidth());
iter++;
assert(iter != runs.End());
next_run = this->buffer_begin + iter->first + 1;
begin = this->buffer;
}
if (IsWhitespace(c)) last_space = this->buffer;
last_char = 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 = NULL;
return l;
}
if (last_space == NULL) {
/* 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. */
this->buffer--;
last_char = this->buffer;
} else {
/* A space is found; perfect place to terminate */
this->buffer = last_space;
last_char = last_space - 1;
}
break;
}
}
}
if (last_char - begin != 0) {
*l->Append() = new VisualRun(iter->second, begin, last_char - begin, l->getWidth());
}
return l;
}
/**
* Appand 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.
*/
size_t Layouter::AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c)
{
*buff = c;
return 1;
}
/**
* Get the actual ParagraphLayout for the given buffer.
* @param buff_end The location after the last element in the buffer.
* @return The ParagraphLayout instance.
*/
ParagraphLayout *Layouter::GetParagraphLayout(WChar *buff_end)
{
return new ParagraphLayout(this->buffer, buff_end - this->buffer, this->fonts);
}
#endif /* !WITH_ICU */
/**
* Create a new layouter.
* @param str The string to create the layout for.
* @param maxw The maximum width.
* @param colour The colour of the font.
* @param fontsize The size of font to use.
*/
Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsize)
{
const CharType *buffer_last = lastof(this->buffer);
CharType *buff = this->buffer;
TextColour cur_colour = colour, prev_colour = colour;
Font *f = new Font(fontsize, cur_colour);
/*
* Go through the whole string while adding Font instances to the font map
* whenever the font changes, and convert the wide characters into a format
* usable by ParagraphLayout.
*/
for (; buff < buffer_last;) {
WChar c = Utf8Consume(const_cast<const char **>(&str));
if (c == 0) {
break;
} else if (c >= SCC_BLUE && c <= SCC_BLACK) {
prev_colour = cur_colour;
cur_colour = (TextColour)(c - SCC_BLUE);
} else if (c == SCC_PREVIOUS_COLOUR) { // Revert to the previous colour.
Swap(prev_colour, cur_colour);
} else if (c == SCC_TINYFONT) {
fontsize = FS_SMALL;
} else if (c == SCC_BIGFONT) {
fontsize = FS_LARGE;
} else {
buff += AppendToBuffer(buff, buffer_last, c);
continue;
}
if (!this->fonts.Contains(buff - this->buffer)) {
this->fonts.Insert(buff - this->buffer, f);
} else {
delete f;
}
f = new Font(fontsize, cur_colour);
}
/* Better safe than sorry. */
*buff = '\0';
if (!this->fonts.Contains(buff - this->buffer)) {
this->fonts.Insert(buff - this->buffer, f);
}
ParagraphLayout *p = GetParagraphLayout(buff);
/* Copy all lines into a local cache so we can reuse them later on more easily. */
ParagraphLayout::Line *l;
while ((l = p->nextLine(maxw)) != NULL) {
*this->Append() = l;
}
delete p;
}
/** Free everything we allocated. */
Layouter::~Layouter()
{
for (FontMap::iterator iter = this->fonts.Begin(); iter != this->fonts.End(); iter++) {
delete iter->second;
}
}
/**
* Get the boundaries of this paragraph.
* @return The boundaries.
*/
Dimension Layouter::GetBounds()
{
Dimension d = { 0, 0 };
for (ParagraphLayout::Line **l = this->Begin(); l != this->End(); l++) {
d.width = max<uint>(d.width, (*l)->getWidth());
d.height += (*l)->getLeading();
}
return d;
}
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