1 /*
2 * Inkscape::Text::Layout - text layout engine output functions
3 *
4 * Authors:
5 * Richard Hughes <cyreve@users.sf.net>
6 *
7 * Copyright (C) 2005 Richard Hughes
8 *
9 * Released under GNU GPL, read the file 'COPYING' for more information
10 */
11 #include <glib/gmem.h>
12 #include "Layout-TNG.h"
13 #include "display/nr-arena-glyphs.h"
14 #include "style.h"
15 #include "print.h"
16 #include "extension/print.h"
17 #include "livarot/Path.h"
18 #include "libnr/nr-matrix-fns.h"
19 #include "libnr/nr-scale-matrix-ops.h"
20 #include "font-instance.h"
21 #include "svg/svg-length.h"
22 #include "extension/internal/cairo-render-context.h"
23 #include "display/curve.h"
25 namespace Inkscape {
26 namespace Extension {
27 namespace Internal {
28 class CairoRenderContext;
29 class CairoGlyphInfo;
30 }
31 }
32 }
34 using Inkscape::Extension::Internal::CairoRenderContext;
35 using Inkscape::Extension::Internal::CairoGlyphInfo;
37 namespace Inkscape {
38 namespace Text {
40 void Layout::_clearOutputObjects()
41 {
42 _paragraphs.clear();
43 _lines.clear();
44 _chunks.clear();
45 for (std::vector<Span>::iterator it_span = _spans.begin() ; it_span != _spans.end() ; it_span++)
46 if (it_span->font) it_span->font->Unref();
47 _spans.clear();
48 _characters.clear();
49 _glyphs.clear();
50 _path_fitted = NULL;
51 }
53 void Layout::LineHeight::max(LineHeight const &other)
54 {
55 if (other.ascent > ascent) ascent = other.ascent;
56 if (other.descent > descent) descent = other.descent;
57 if (other.leading > leading) leading = other.leading;
58 }
60 void Layout::_getGlyphTransformMatrix(int glyph_index, NR::Matrix *matrix) const
61 {
62 Span const &span = _glyphs[glyph_index].span(this);
63 double sin_rotation = sin(_glyphs[glyph_index].rotation);
64 double cos_rotation = cos(_glyphs[glyph_index].rotation);
65 (*matrix)[0] = span.font_size * cos_rotation;
66 (*matrix)[1] = span.font_size * sin_rotation;
67 (*matrix)[2] = span.font_size * sin_rotation;
68 (*matrix)[3] = -span.font_size * cos_rotation;
69 if (span.block_progression == LEFT_TO_RIGHT || span.block_progression == RIGHT_TO_LEFT) {
70 (*matrix)[4] = _lines[_chunks[span.in_chunk].in_line].baseline_y + _glyphs[glyph_index].y;
71 (*matrix)[5] = _chunks[span.in_chunk].left_x + _glyphs[glyph_index].x;
72 } else {
73 (*matrix)[4] = _chunks[span.in_chunk].left_x + _glyphs[glyph_index].x;
74 (*matrix)[5] = _lines[_chunks[span.in_chunk].in_line].baseline_y + _glyphs[glyph_index].y;
75 }
76 }
78 void Layout::show(NRArenaGroup *in_arena, NRRect const *paintbox) const
79 {
80 int glyph_index = 0;
81 for (unsigned span_index = 0 ; span_index < _spans.size() ; span_index++) {
82 if (_input_stream[_spans[span_index].in_input_stream_item]->Type() != TEXT_SOURCE) continue;
83 InputStreamTextSource const *text_source = static_cast<InputStreamTextSource const *>(_input_stream[_spans[span_index].in_input_stream_item]);
84 NRArenaGlyphsGroup *nr_group = NRArenaGlyphsGroup::create(in_arena->arena);
85 nr_arena_item_add_child(in_arena, nr_group, NULL);
86 nr_arena_item_unref(nr_group);
88 nr_arena_glyphs_group_set_style(nr_group, text_source->style);
89 while (glyph_index < (int)_glyphs.size() && _characters[_glyphs[glyph_index].in_character].in_span == span_index) {
90 if (_characters[_glyphs[glyph_index].in_character].in_glyph != -1) {
91 NR::Matrix glyph_matrix;
92 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
93 nr_arena_glyphs_group_add_component(nr_group, _spans[span_index].font, _glyphs[glyph_index].glyph, &glyph_matrix);
94 }
95 glyph_index++;
96 }
97 nr_arena_glyphs_group_set_paintbox(NR_ARENA_GLYPHS_GROUP(nr_group), paintbox);
98 }
99 nr_arena_item_request_update(NR_ARENA_ITEM(in_arena), NR_ARENA_ITEM_STATE_ALL, FALSE);
100 }
102 void Layout::getBoundingBox(NRRect *bounding_box, NR::Matrix const &transform, int start, int length) const
103 {
104 for (unsigned glyph_index = 0 ; glyph_index < _glyphs.size() ; glyph_index++) {
105 if (_characters[_glyphs[glyph_index].in_character].in_glyph == -1) continue;
106 if (start != -1 && (int) _glyphs[glyph_index].in_character < start) continue;
107 if (length != -1) {
108 if (start == -1)
109 start = 0;
110 if ((int) _glyphs[glyph_index].in_character > start + length) continue;
111 }
112 // this could be faster
113 NR::Matrix glyph_matrix;
114 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
115 NR::Matrix total_transform = glyph_matrix;
116 total_transform *= transform;
117 NR::Maybe<NR::Rect> glyph_rect = _glyphs[glyph_index].span(this).font->BBox(_glyphs[glyph_index].glyph);
118 if (glyph_rect) {
119 NR::Point bmi = glyph_rect->min(), bma = glyph_rect->max();
120 NR::Point tlp(bmi[0],bmi[1]), trp(bma[0],bmi[1]), blp(bmi[0],bma[1]), brp(bma[0],bma[1]);
121 tlp *= total_transform;
122 trp *= total_transform;
123 blp *= total_transform;
124 brp *= total_transform;
125 *glyph_rect = NR::Rect(tlp,trp);
126 glyph_rect->expandTo(blp);
127 glyph_rect->expandTo(brp);
128 if ( (glyph_rect->min())[0] < bounding_box->x0 ) bounding_box->x0=(glyph_rect->min())[0];
129 if ( (glyph_rect->max())[0] > bounding_box->x1 ) bounding_box->x1=(glyph_rect->max())[0];
130 if ( (glyph_rect->min())[1] < bounding_box->y0 ) bounding_box->y0=(glyph_rect->min())[1];
131 if ( (glyph_rect->max())[1] > bounding_box->y1 ) bounding_box->y1=(glyph_rect->max())[1];
132 }
133 }
134 }
136 void Layout::print(SPPrintContext *ctx,
137 NRRect const *pbox, NRRect const *dbox, NRRect const *bbox,
138 NR::Matrix const &ctm) const
139 {
140 if (_input_stream.empty()) return;
142 Direction block_progression = _blockProgression();
143 bool text_to_path = ctx->module->textToPath();
144 for (unsigned glyph_index = 0 ; glyph_index < _glyphs.size() ; ) {
145 if (_characters[_glyphs[glyph_index].in_character].in_glyph == -1) {
146 // invisible glyphs
147 unsigned same_character = _glyphs[glyph_index].in_character;
148 while (_glyphs[glyph_index].in_character == same_character)
149 glyph_index++;
150 continue;
151 }
152 NR::Matrix glyph_matrix;
153 Span const &span = _spans[_characters[_glyphs[glyph_index].in_character].in_span];
154 InputStreamTextSource const *text_source = static_cast<InputStreamTextSource const *>(_input_stream[span.in_input_stream_item]);
155 if (text_to_path || _path_fitted) {
156 NRBPath bpath;
157 bpath.path = (NArtBpath*)span.font->ArtBPath(_glyphs[glyph_index].glyph);
158 if (bpath.path) {
159 const_NRBPath abp;
160 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
161 NArtBpath *temp_bpath = nr_artpath_affine(bpath.path, glyph_matrix);
162 abp.path = temp_bpath;
163 if (!text_source->style->fill.isNone())
164 sp_print_fill(ctx, &abp, &ctm, text_source->style, pbox, dbox, bbox);
165 if (!text_source->style->stroke.isNone())
166 sp_print_stroke(ctx, &abp, &ctm, text_source->style, pbox, dbox, bbox);
167 g_free(temp_bpath);
168 }
169 glyph_index++;
170 } else {
171 NR::Point g_pos(0,0); // all strings are output at (0,0) because we do the translation using the matrix
172 glyph_matrix = NR::Matrix(NR::scale(1.0, -1.0) * NR::Matrix(NR::rotate(_glyphs[glyph_index].rotation)));
173 if (block_progression == LEFT_TO_RIGHT || block_progression == RIGHT_TO_LEFT) {
174 glyph_matrix[4] = span.line(this).baseline_y + span.baseline_shift;
175 // since we're outputting character codes, not glyphs, we want the character x
176 glyph_matrix[5] = span.chunk(this).left_x + span.x_start + _characters[_glyphs[glyph_index].in_character].x;
177 } else {
178 glyph_matrix[4] = span.chunk(this).left_x + span.x_start + _characters[_glyphs[glyph_index].in_character].x;
179 glyph_matrix[5] = span.line(this).baseline_y + span.baseline_shift;
180 }
181 Glib::ustring::const_iterator span_iter = span.input_stream_first_character;
182 unsigned char_index = _glyphs[glyph_index].in_character;
183 unsigned original_span = _characters[char_index].in_span;
184 while (char_index && _characters[char_index - 1].in_span == original_span) {
185 char_index--;
186 span_iter++;
187 }
189 // try to output as many characters as possible in one go by detecting kerning and stopping when we encounter it
190 Glib::ustring span_string;
191 double char_x = _characters[_glyphs[glyph_index].in_character].x;
192 unsigned this_span_index = _characters[_glyphs[glyph_index].in_character].in_span;
193 do {
194 span_string += *span_iter;
195 span_iter++;
197 unsigned same_character = _glyphs[glyph_index].in_character;
198 while (glyph_index < _glyphs.size() && _glyphs[glyph_index].in_character == same_character) {
199 char_x += _glyphs[glyph_index].width;
200 glyph_index++;
201 }
202 } while (glyph_index < _glyphs.size()
203 && _path_fitted == NULL
204 && _characters[_glyphs[glyph_index].in_character].in_span == this_span_index
205 && fabs(char_x - _characters[_glyphs[glyph_index].in_character].x) < 1e-5);
206 sp_print_bind(ctx, glyph_matrix, 1.0);
207 sp_print_text(ctx, span_string.c_str(), g_pos, text_source->style);
208 sp_print_release(ctx);
209 }
210 }
211 }
213 #ifdef HAVE_CAIRO_PDF
214 void Layout::showGlyphs(CairoRenderContext *ctx) const
215 {
216 if (_input_stream.empty()) return;
218 bool clip_mode = false;//(ctx->getRenderMode() == CairoRenderContext::RENDER_MODE_CLIP);
219 std::vector<CairoGlyphInfo> glyphtext;
221 for (unsigned glyph_index = 0 ; glyph_index < _glyphs.size() ; ) {
222 if (_characters[_glyphs[glyph_index].in_character].in_glyph == -1) {
223 // invisible glyphs
224 unsigned same_character = _glyphs[glyph_index].in_character;
225 while (_glyphs[glyph_index].in_character == same_character)
226 glyph_index++;
227 continue;
228 }
229 Span const &span = _spans[_characters[_glyphs[glyph_index].in_character].in_span];
230 InputStreamTextSource const *text_source = static_cast<InputStreamTextSource const *>(_input_stream[span.in_input_stream_item]);
232 NR::Matrix glyph_matrix;
233 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
234 if (clip_mode) {
235 NArtBpath *bpath = (NArtBpath*)span.font->ArtBPath(_glyphs[glyph_index].glyph);
236 if (bpath) {
237 NArtBpath *abp = nr_artpath_affine(bpath, glyph_matrix);
238 const_NRBPath bpath;
239 bpath.path = abp;
240 SPStyle const *style = text_source->style;
241 ctx->renderPath(&bpath, style, NULL);
242 g_free(abp);
243 }
244 glyph_index++;
245 continue;
246 }
248 NR::Matrix font_matrix;
249 if (_path_fitted == NULL) {
250 font_matrix = glyph_matrix;
251 font_matrix[4] = 0;
252 font_matrix[5] = 0;
253 } else {
254 font_matrix.set_identity();
255 }
257 Glib::ustring::const_iterator span_iter = span.input_stream_first_character;
258 unsigned char_index = _glyphs[glyph_index].in_character;
259 unsigned original_span = _characters[char_index].in_span;
260 while (char_index && _characters[char_index - 1].in_span == original_span) {
261 char_index--;
262 span_iter++;
263 }
265 // try to output as many characters as possible in one go
266 Glib::ustring span_string;
267 unsigned this_span_index = _characters[_glyphs[glyph_index].in_character].in_span;
268 unsigned int first_index = glyph_index;
269 glyphtext.clear();
270 do {
271 span_string += *span_iter;
272 span_iter++;
274 unsigned same_character = _glyphs[glyph_index].in_character;
275 while (glyph_index < _glyphs.size() && _glyphs[glyph_index].in_character == same_character) {
276 if (glyph_index != first_index)
277 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
279 CairoGlyphInfo info;
280 info.index = _glyphs[glyph_index].glyph;
281 if (_path_fitted == NULL) {
282 info.x = glyph_matrix[4];
283 info.y = glyph_matrix[5];
284 } else {
285 info.x = 0;
286 info.y = 0;
287 }
288 glyphtext.push_back(info);
290 glyph_index++;
291 }
292 } while (glyph_index < _glyphs.size()
293 && _path_fitted == NULL
294 && NR::transform_equalp(font_matrix, glyph_matrix, NR_EPSILON)
295 && _characters[_glyphs[glyph_index].in_character].in_span == this_span_index);
297 // remove vertical flip
298 font_matrix[3] *= -1.0;
300 SPStyle const *style = text_source->style;
301 float opacity = SP_SCALE24_TO_FLOAT(style->opacity.value);
303 if (_path_fitted) {
304 ctx->pushState();
305 ctx->transform(&glyph_matrix);
306 } else if (opacity != 1.0) {
307 ctx->pushState();
308 ctx->setStateForStyle(style);
309 ctx->pushLayer();
310 }
311 if (glyph_index - first_index > 0)
312 ctx->renderGlyphtext(span.font->pFont, &font_matrix, glyphtext, style);
313 if (_path_fitted)
314 ctx->popState();
315 else if (opacity != 1.0) {
316 ctx->popLayer();
317 ctx->popState();
318 }
319 }
320 }
321 #endif
323 // these functions are for dumpAsText() only. No need to translate
324 static char const *direction_to_text(Layout::Direction d)
325 {
326 switch (d) {
327 case Layout::LEFT_TO_RIGHT: return "ltr";
328 case Layout::RIGHT_TO_LEFT: return "rtl";
329 case Layout::TOP_TO_BOTTOM: return "ttb";
330 case Layout::BOTTOM_TO_TOP: return "btt";
331 }
332 return "???";
333 }
335 static char const *style_to_text(PangoStyle s)
336 {
337 switch (s) {
338 case PANGO_STYLE_NORMAL: return "upright";
339 case PANGO_STYLE_ITALIC: return "italic";
340 case PANGO_STYLE_OBLIQUE: return "oblique";
341 }
342 return "???";
343 }
345 static char const *weight_to_text(PangoWeight w)
346 {
347 switch (w) {
348 case PANGO_WEIGHT_ULTRALIGHT: return "ultralight";
349 case PANGO_WEIGHT_LIGHT : return "light";
350 case PANGO_WEIGHT_SEMIBOLD : return "semibold";
351 case PANGO_WEIGHT_NORMAL : return "normalweight";
352 case PANGO_WEIGHT_BOLD : return "bold";
353 case PANGO_WEIGHT_ULTRABOLD : return "ultrabold";
354 case PANGO_WEIGHT_HEAVY : return "heavy";
355 }
356 return "???";
357 }
359 Glib::ustring Layout::dumpAsText() const
360 {
361 Glib::ustring result;
363 for (unsigned span_index = 0 ; span_index < _spans.size() ; span_index++) {
364 char line[256];
365 snprintf(line, sizeof(line), "==== span %d\n", span_index);
366 result += line;
367 snprintf(line, sizeof(line), " in para %d (direction=%s)\n", _lines[_chunks[_spans[span_index].in_chunk].in_line].in_paragraph,
368 direction_to_text(_paragraphs[_lines[_chunks[_spans[span_index].in_chunk].in_line].in_paragraph].base_direction));
369 result += line;
370 snprintf(line, sizeof(line), " in source %d (type=%d, cookie=%p)\n", _spans[span_index].in_input_stream_item,
371 _input_stream[_spans[span_index].in_input_stream_item]->Type(),
372 _input_stream[_spans[span_index].in_input_stream_item]->source_cookie);
373 result += line;
374 snprintf(line, sizeof(line), " in line %d (baseline=%f, shape=%d)\n", _chunks[_spans[span_index].in_chunk].in_line,
375 _lines[_chunks[_spans[span_index].in_chunk].in_line].baseline_y,
376 _lines[_chunks[_spans[span_index].in_chunk].in_line].in_shape);
377 result += line;
378 snprintf(line, sizeof(line), " in chunk %d (x=%f, baselineshift=%f)\n", _spans[span_index].in_chunk, _chunks[_spans[span_index].in_chunk].left_x, _spans[span_index].baseline_shift);
379 result += line;
380 if (_spans[span_index].font) {
381 snprintf(line, sizeof(line), " font '%s' %f %s %s\n", pango_font_description_get_family(_spans[span_index].font->descr), _spans[span_index].font_size, style_to_text(pango_font_description_get_style(_spans[span_index].font->descr)), weight_to_text(pango_font_description_get_weight(_spans[span_index].font->descr)));
382 result += line;
383 }
384 snprintf(line, sizeof(line), " x_start = %f, x_end = %f\n", _spans[span_index].x_start, _spans[span_index].x_end);
385 result += line;
386 snprintf(line, sizeof(line), " line height: ascent %f, descent %f leading %f\n", _spans[span_index].line_height.ascent, _spans[span_index].line_height.descent, _spans[span_index].line_height.leading);
387 result += line;
388 snprintf(line, sizeof(line), " direction %s, block-progression %s\n", direction_to_text(_spans[span_index].direction), direction_to_text(_spans[span_index].block_progression));
389 result += line;
390 result += " ** characters:\n";
391 Glib::ustring::const_iterator iter_char = _spans[span_index].input_stream_first_character;
392 // very inefficent code. what the hell, it's only debug stuff.
393 for (unsigned char_index = 0 ; char_index < _characters.size() ; char_index++) {
394 if (_characters[char_index].in_span != span_index) continue;
395 if (_input_stream[_spans[span_index].in_input_stream_item]->Type() != TEXT_SOURCE) {
396 snprintf(line, sizeof(line), " %d: control x=%f flags=%03x glyph=%d\n", char_index, _characters[char_index].x, *(unsigned*)&_characters[char_index].char_attributes, _characters[char_index].in_glyph);
397 } else {
398 snprintf(line, sizeof(line), " %d: '%c' x=%f flags=%03x glyph=%d\n", char_index, *iter_char, _characters[char_index].x, *(unsigned*)&_characters[char_index].char_attributes, _characters[char_index].in_glyph);
399 iter_char++;
400 }
401 result += line;
402 }
403 result += " ** glyphs:\n";
404 for (unsigned glyph_index = 0 ; glyph_index < _glyphs.size() ; glyph_index++) {
405 if (_characters[_glyphs[glyph_index].in_character].in_span != span_index) continue;
406 snprintf(line, sizeof(line), " %d: %d (%f,%f) rot=%f cx=%f char=%d\n", glyph_index, _glyphs[glyph_index].glyph, _glyphs[glyph_index].x, _glyphs[glyph_index].y, _glyphs[glyph_index].rotation, _glyphs[glyph_index].width, _glyphs[glyph_index].in_character);
407 result += line;
408 }
409 result += "\n";
410 }
411 result += "EOT\n";
412 return result;
413 }
415 void Layout::fitToPathAlign(SVGLength const &startOffset, Path const &path)
416 {
417 double offset = 0.0;
419 if (startOffset._set) {
420 if (startOffset.unit == SVGLength::PERCENT)
421 offset = startOffset.computed * const_cast<Path&>(path).Length();
422 else
423 offset = startOffset.computed;
424 }
426 switch (_paragraphs.front().alignment) {
427 case CENTER:
428 offset -= _getChunkWidth(0) * 0.5;
429 break;
430 case RIGHT:
431 offset -= _getChunkWidth(0);
432 break;
433 default:
434 break;
435 }
437 if (_characters.empty()) {
438 int unused = 0;
439 Path::cut_position *point_otp = const_cast<Path&>(path).CurvilignToPosition(1, &offset, unused);
440 if (offset >= 0.0 && point_otp != NULL && point_otp[0].piece >= 0) {
441 NR::Point point;
442 NR::Point tangent;
443 const_cast<Path&>(path).PointAndTangentAt(point_otp[0].piece, point_otp[0].t, point, tangent);
444 _empty_cursor_shape.position = point;
445 _empty_cursor_shape.rotation = atan2(tangent[NR::Y], tangent[NR::X]);
446 }
447 }
449 for (unsigned char_index = 0 ; char_index < _characters.size() ; ) {
450 int next_cluster_glyph_index;
451 unsigned next_cluster_char_index;
452 double character_advance;
453 Span const &span = _characters[char_index].span(this);
455 for (next_cluster_char_index = char_index + 1 ;
456 next_cluster_char_index < _characters.size() && !_characters[next_cluster_char_index].char_attributes.is_cursor_position;
457 next_cluster_char_index++);
459 if (next_cluster_char_index == _characters.size()) {
460 next_cluster_glyph_index = _glyphs.size();
461 character_advance = 0.0; // arbitrary because we're not going to advance
462 } else {
463 next_cluster_glyph_index = _characters[next_cluster_char_index].in_glyph;
464 character_advance = (_glyphs[next_cluster_glyph_index].x + _glyphs[next_cluster_glyph_index].chunk(this).left_x)
465 - (_glyphs[_characters[char_index].in_glyph].x + span.chunk(this).left_x);
466 }
468 double start_offset = offset + span.x_start + _characters[char_index].x;
469 double cluster_width = 0.0;
470 for (int glyph_index = _characters[char_index].in_glyph ; glyph_index < next_cluster_glyph_index ; glyph_index++)
471 cluster_width += _glyphs[glyph_index].width;
472 if (span.direction == RIGHT_TO_LEFT)
473 start_offset -= cluster_width;
474 double end_offset = start_offset + cluster_width;
476 int unused = 0;
477 double midpoint_offset = (start_offset + end_offset) * 0.5;
478 // as far as I know these functions are const, they're just not marked as such
479 Path::cut_position *midpoint_otp = const_cast<Path&>(path).CurvilignToPosition(1, &midpoint_offset, unused);
480 if (midpoint_offset >= 0.0 && midpoint_otp != NULL && midpoint_otp[0].piece >= 0) {
481 NR::Point midpoint;
482 NR::Point tangent;
484 const_cast<Path&>(path).PointAndTangentAt(midpoint_otp[0].piece, midpoint_otp[0].t, midpoint, tangent);
486 if (start_offset >= 0.0 && end_offset >= 0.0) {
487 Path::cut_position *start_otp = const_cast<Path&>(path).CurvilignToPosition(1, &start_offset, unused);
488 if (start_otp != NULL && start_otp[0].piece >= 0) {
489 Path::cut_position *end_otp = const_cast<Path&>(path).CurvilignToPosition(1, &end_offset, unused);
490 if (end_otp != NULL && end_otp[0].piece >= 0) {
491 bool on_same_subpath = true;
492 for (size_t i = 0 ; i < path.pts.size() ; i++) {
493 if (path.pts[i].piece <= start_otp[0].piece) continue;
494 if (path.pts[i].piece >= end_otp[0].piece) break;
495 if (path.pts[i].isMoveTo == polyline_moveto) {
496 on_same_subpath = false;
497 break;
498 }
499 }
500 if (on_same_subpath) {
501 // both points were on the same subpath (without this test the angle is very weird)
502 NR::Point startpoint, endpoint;
503 const_cast<Path&>(path).PointAt(start_otp[0].piece, start_otp[0].t, startpoint);
504 const_cast<Path&>(path).PointAt(end_otp[0].piece, end_otp[0].t, endpoint);
505 if (endpoint != startpoint) {
506 tangent = endpoint - startpoint;
507 tangent.normalize();
508 } else {
509 tangent = NR::Point (0,0);
510 }
511 }
512 g_free(end_otp);
513 }
514 g_free(start_otp);
515 }
516 }
518 double rotation = atan2(tangent[1], tangent[0]);
519 for (int glyph_index = _characters[char_index].in_glyph ; glyph_index < next_cluster_glyph_index ; glyph_index++) {
520 double tangent_shift = -cluster_width * 0.5 + _glyphs[glyph_index].x - (_characters[char_index].x + span.x_start);
521 double normal_shift = _glyphs[glyph_index].y;
522 if (span.direction == RIGHT_TO_LEFT)
523 tangent_shift += cluster_width;
524 _glyphs[glyph_index].x = midpoint[0] - span.chunk(this).left_x + tangent[0] * tangent_shift - tangent[1] * normal_shift;
525 _glyphs[glyph_index].y = midpoint[1] - _lines.front().baseline_y + tangent[1] * tangent_shift + tangent[0] * normal_shift;
526 _glyphs[glyph_index].rotation += rotation;
527 }
528 } else { // outside the bounds of the path: hide the glyphs
529 _characters[char_index].in_glyph = -1;
530 }
531 g_free(midpoint_otp);
533 char_index = next_cluster_char_index;
534 }
536 for (unsigned span_index = 0 ; span_index < _spans.size() ; span_index++) {
537 _spans[span_index].x_start += offset;
538 _spans[span_index].x_end += offset;
539 }
541 _path_fitted = &path;
542 }
544 SPCurve *Layout::convertToCurves(iterator const &from_glyph, iterator const &to_glyph) const
545 {
546 GSList *cc = NULL;
548 for (int glyph_index = from_glyph._glyph_index ; glyph_index < to_glyph._glyph_index ; glyph_index++) {
549 NR::Matrix glyph_matrix;
550 Span const &span = _glyphs[glyph_index].span(this);
551 _getGlyphTransformMatrix(glyph_index, &glyph_matrix);
553 NRBPath bpath;
554 bpath.path = (NArtBpath*)span.font->ArtBPath(_glyphs[glyph_index].glyph);
555 if (bpath.path) {
556 NArtBpath *abp = nr_artpath_affine(bpath.path, glyph_matrix);
557 SPCurve *c = SPCurve::new_from_bpath(abp);
558 if (c) cc = g_slist_prepend(cc, c);
559 }
560 }
561 cc = g_slist_reverse(cc);
563 SPCurve *curve;
564 if ( cc ) {
565 curve = SPCurve::concat(cc);
566 } else {
567 curve = new SPCurve();
568 }
570 while (cc) {
571 /* fixme: This is dangerous, as we are mixing art_alloc and g_new */
572 reinterpret_cast<SPCurve *>(cc->data)->unref();
573 cc = g_slist_remove(cc, cc->data);
574 }
576 return curve;
577 }
579 void Layout::transform(NR::Matrix const &transform)
580 {
581 // this is all massively oversimplified
582 // I can't actually think of anybody who'll want to use it at the moment, so it'll stay simple
583 for (unsigned glyph_index = 0 ; glyph_index < _glyphs.size() ; glyph_index++) {
584 NR::Point point(_glyphs[glyph_index].x, _glyphs[glyph_index].y);
585 point *= transform;
586 _glyphs[glyph_index].x = point[0];
587 _glyphs[glyph_index].y = point[1];
588 }
589 }
591 }//namespace Text
592 }//namespace Inkscape
595 /*
596 Local Variables:
597 mode:c++
598 c-file-style:"stroustrup"
599 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
600 indent-tabs-mode:nil
601 fill-column:99
602 End:
603 */
604 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :