4 // Copyright (C) 2006 Matthias Braun <matze@braunis.de>
5 // Ingo Ruhnke <grumbel@gmx.de>
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License
9 // as published by the Free Software Foundation; either version 2
10 // of the License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 #include <SDL_image.h>
28 #include "physfs/physfs_sdl.hpp"
30 #include "lisp/parser.hpp"
31 #include "lisp/lisp.hpp"
34 //#include "renderer.hpp"
35 #include <unison/video/Blittable.hpp>
36 #include "drawing_context.hpp"
40 bool has_multibyte_mark(unsigned char c);
41 uint32_t decode_utf8(const std::string& text, size_t& p);
45 const std::string& text;
46 std::string::size_type pos;
49 UTF8Iterator(const std::string& text_)
53 chr = decode_utf8(text, pos);
58 return pos > text.size();
61 UTF8Iterator& operator++() {
63 chr = decode_utf8(text, pos);
64 } catch (std::runtime_error) {
65 log_debug << "Malformed utf-8 sequence beginning with " << *((uint32_t*)(text.c_str() + pos)) << " found " << std::endl;
73 uint32_t operator*() const {
78 bool vline_empty(SDL_Surface* surface, int x, int start_y, int end_y, Uint8 threshold)
80 Uint8* pixels = (Uint8*)surface->pixels;
82 for(int y = start_y; y < end_y; ++y)
84 const Uint8& p = pixels[surface->pitch*y + x*surface->format->BytesPerPixel + 3];
94 Font::Font(GlyphWidth glyph_width_,
95 const std::string& filename,
96 const std::string& shadowfile,
97 int char_width, int char_height_,
99 : glyph_width(glyph_width_),
100 glyph_surface(0), shadow_glyph_surface(0),
101 char_height(char_height_),
102 shadowsize(shadowsize_)
104 glyph_surface = new Surface(filename);
105 shadow_glyph_surface = new Surface(shadowfile);
108 char_count = ((int) glyph_surface->get_height() / char_height) * 16;
110 if (glyph_width == FIXED)
112 for(uint32_t i = 0; i < char_count; ++i)
114 float x = (i % 16) * char_width;
115 float y = (i / 16) * char_height;
118 glyph.advance = char_width;
119 glyph.offset = Vector(0, 0);
120 glyph.rect = Rect(x, y, x + char_width, y + char_height);
122 glyphs.push_back(glyph);
123 shadow_glyphs.push_back(glyph);
126 else // glyph_width == VARIABLE
128 // Load the surface into RAM and scan the pixel data for characters
129 SDL_Surface* surface = IMG_Load_RW(get_physfs_SDLRWops(filename), 1);
130 if(surface == NULL) {
131 std::ostringstream msg;
132 msg << "Couldn't load image '" << filename << "' :" << SDL_GetError();
133 throw std::runtime_error(msg.str());
136 SDL_LockSurface(surface);
138 for(uint32_t i = 0; i < char_count; ++i)
140 int x = (i % 16) * char_width;
141 int y = (i / 16) * char_height;
144 while (left < x + char_width &&
145 vline_empty(surface, left, y, y + char_height, 64))
148 int right = x + char_width - 1;
149 while (right > left &&
150 vline_empty(surface, right, y, y + char_height, 64))
154 glyph.offset = Vector(0, 0);
157 glyph.rect = Rect(left, y, right+1, y + char_height);
158 else // glyph is completly transparent
159 glyph.rect = Rect(x, y, x + char_width, y + char_height);
161 glyph.advance = glyph.rect.get_width() + 1; // FIXME: might be usefull to make spacing configurable
163 glyphs.push_back(glyph);
164 shadow_glyphs.push_back(glyph);
167 SDL_UnlockSurface(surface);
169 SDL_FreeSurface(surface);
175 delete glyph_surface;
176 delete shadow_glyph_surface;
180 Font::get_text_width(const std::string& text) const
182 float curr_width = 0;
183 float last_width = 0;
185 for(UTF8Iterator it(text); !it.done(); ++it)
189 last_width = std::max(last_width, curr_width);
194 int idx = chr2glyph(*it);
195 curr_width += glyphs[idx].advance;
199 return std::max(curr_width, last_width);
203 Font::get_text_height(const std::string& text) const
205 std::string::size_type text_height = char_height;
207 for(std::string::const_iterator it = text.begin(); it != text.end(); ++it)
208 { // since UTF8 multibyte characters are decoded with values
209 // outside the ASCII range there is no risk of overlapping and
210 // thus we don't need to decode the utf-8 string
212 text_height += char_height + 2;
219 Font::get_height() const
225 Font::wrap_to_chars(const std::string& s, int line_length, std::string* overflow)
227 // if text is already smaller, return full text
228 if ((int)s.length() <= line_length) {
229 if (overflow) *overflow = "";
233 // if we can find a whitespace character to break at, return text up to this character
235 while ((i > 0) && (s[i] != ' ')) i--;
237 if (overflow) *overflow = s.substr(i+1);
238 return s.substr(0, i);
241 // FIXME: wrap at line_length, taking care of multibyte characters
242 if (overflow) *overflow = "";
247 Font::wrap_to_width(const std::string& s, float width, std::string* overflow)
249 // if text is already smaller, return full text
250 if (get_text_width(s) <= width) {
251 if (overflow) *overflow = "";
255 // if we can find a whitespace character to break at, return text up to this character
256 for (int i = s.length()-1; i >= 0; i--) {
257 std::string s2 = s.substr(0,i);
258 if (s[i] != ' ') continue;
259 if (get_text_width(s2) <= width) {
260 if (overflow) *overflow = s.substr(i+1);
261 return s.substr(0, i);
265 // FIXME: hard-wrap at width, taking care of multibyte characters
266 if (overflow) *overflow = "";
271 Font::draw(Unison::Video::Blittable &dst, const std::string& text, const Vector& pos_,
272 FontAlignment alignment, DrawingEffect drawing_effect,
278 std::string::size_type last = 0;
279 for(std::string::size_type i = 0;; ++i)
281 if (text[i] == '\n' || i == text.size())
283 std::string temp = text.substr(last, i - last);
285 // calculate X positions based on the alignment type
286 Vector pos = Vector(x, y);
288 if(alignment == ALIGN_CENTER)
289 pos.x -= get_text_width(temp) / 2;
290 else if(alignment == ALIGN_RIGHT)
291 pos.x -= get_text_width(temp);
293 // Cast font position to integer to get a clean drawing result and
294 // no bluring as we would get with subpixel positions
295 pos.x = static_cast<int>(pos.x);
297 draw_text(dst, temp, pos, drawing_effect, alpha);
299 if (i == text.size())
302 y += char_height + 2;
309 Font::draw_text(Unison::Video::Blittable &dst, const std::string& text, const Vector& pos,
310 DrawingEffect drawing_effect, float alpha) const
314 // FIXME: shadow_glyph_surface and glyph_surface do currently
315 // share the same glyph array, this is incorrect and should be
316 // fixed, it is however hardly noticable
317 draw_chars(dst, shadow_glyph_surface, text,
318 pos + Vector(shadowsize, shadowsize), drawing_effect, alpha);
321 draw_chars(dst, glyph_surface, text, pos, drawing_effect, alpha);
325 Font::chr2glyph(uint32_t chr) const
327 int glyph_index = chr - first_char;
329 // we don't have the control chars 0x80-0xa0 in the font
330 if (chr >= 0x80) { // non-ascii character
333 log_debug << "Unsupported utf-8 character '" << chr << "' found" << std::endl;
338 if(glyph_index < 0 || glyph_index >= (int) char_count) {
339 log_debug << "Unsupported utf-8 character found" << std::endl;
347 Font::draw_chars(Unison::Video::Blittable &dst, Surface* pchars, const std::string& text,
348 const Vector& pos, DrawingEffect drawing_effect,
353 for(UTF8Iterator it(text); !it.done(); ++it)
355 int font_index = chr2glyph(*it);
360 p.y += char_height + 2;
364 p.x += glyphs[font_index].advance;
368 const Glyph& glyph = glyphs[font_index];
372 Unison::Video::TextureSection texture = pchars->get_texture();
373 texture.clip_rect.pos.x += (int) glyph.rect.p1.x;
374 texture.clip_rect.pos.y += (int) glyph.rect.p1.y;
375 texture.clip_rect.size.x += (unsigned int) glyph.rect.get_width();
376 texture.clip_rect.size.y += (unsigned int) glyph.rect.get_height();
378 Unison::Video::RenderOptions options;
379 options.alpha = (unsigned char) alpha * 0xff;
380 options.h_flip = (drawing_effect == HORIZONTAL_FLIP);
381 options.v_flip = (drawing_effect == VERTICAL_FLIP);
383 Vector transformed = p + glyph.offset;
384 Unison::Video::Point dst_pos((int) transformed.x, (int) transformed.y);
386 dst.blit_section(texture, dst_pos, options);
388 /*DrawingRequest request;
390 request.pos = p + glyph.offset;
391 request.drawing_effect = drawing_effect;
392 request.alpha = alpha;
394 SurfacePartRequest surfacepartrequest;
395 surfacepartrequest.size = glyph.rect.p2 - glyph.rect.p1;
396 surfacepartrequest.source = glyph.rect.p1;
397 surfacepartrequest.surface = pchars;
399 request.request_data = &surfacepartrequest;
400 renderer->draw_surface_part(request);
402 p.x += glyphs[font_index].advance;*/
411 * returns true if this byte matches a bitmask of 10xx.xxxx, i.e. it is the 2nd, 3rd or 4th byte of a multibyte utf8 string
413 bool has_multibyte_mark(unsigned char c) {
414 return ((c & 0300) == 0200);
418 * gets unicode character at byte position @a p of UTF-8 encoded @a
419 * text, then advances @a p to the next character.
421 * @throws std::runtime_error if decoding fails.
422 * See unicode standard section 3.10 table 3-5 and 3-6 for details.
424 uint32_t decode_utf8(const std::string& text, size_t& p)
426 uint32_t c1 = (unsigned char) text[p+0];
428 if (has_multibyte_mark(c1)) std::runtime_error("Malformed utf-8 sequence");
430 if ((c1 & 0200) == 0000) {
431 // 0xxx.xxxx: 1 byte sequence
435 else if ((c1 & 0340) == 0300) {
436 // 110x.xxxx: 2 byte sequence
437 if(p+1 >= text.size()) throw std::range_error("Malformed utf-8 sequence");
438 uint32_t c2 = (unsigned char) text[p+1];
439 if (!has_multibyte_mark(c2)) throw std::runtime_error("Malformed utf-8 sequence");
441 return (c1 & 0037) << 6 | (c2 & 0077);
443 else if ((c1 & 0360) == 0340) {
444 // 1110.xxxx: 3 byte sequence
445 if(p+2 >= text.size()) throw std::range_error("Malformed utf-8 sequence");
446 uint32_t c2 = (unsigned char) text[p+1];
447 uint32_t c3 = (unsigned char) text[p+2];
448 if (!has_multibyte_mark(c2)) throw std::runtime_error("Malformed utf-8 sequence");
449 if (!has_multibyte_mark(c3)) throw std::runtime_error("Malformed utf-8 sequence");
451 return (c1 & 0017) << 12 | (c2 & 0077) << 6 | (c3 & 0077);
453 else if ((c1 & 0370) == 0360) {
454 // 1111.0xxx: 4 byte sequence
455 if(p+3 >= text.size()) throw std::range_error("Malformed utf-8 sequence");
456 uint32_t c2 = (unsigned char) text[p+1];
457 uint32_t c3 = (unsigned char) text[p+2];
458 uint32_t c4 = (unsigned char) text[p+4];
459 if (!has_multibyte_mark(c2)) throw std::runtime_error("Malformed utf-8 sequence");
460 if (!has_multibyte_mark(c3)) throw std::runtime_error("Malformed utf-8 sequence");
461 if (!has_multibyte_mark(c4)) throw std::runtime_error("Malformed utf-8 sequence");
463 return (c1 & 0007) << 18 | (c2 & 0077) << 12 | (c3 & 0077) << 6 | (c4 & 0077);
465 throw std::runtime_error("Malformed utf-8 sequence");