CairoOutputDev.cc 55 KB
Newer Older
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1 2 3 4 5 6 7 8
//========================================================================
//
// CairoOutputDev.cc
//
// Copyright 2003 Glyph & Cog, LLC
// Copyright 2004 Red Hat, Inc
//
//========================================================================
9 10 11 12 13

//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
14 15 16
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
17 18
// Copyright (C) 2005-2008 Jeff Muizelaar <jeff@infidigm.net>
// Copyright (C) 2005, 2006 Kristian Høgsberg <krh@redhat.com>
19
// Copyright (C) 2005, 2009 Albert Astals Cid <aacid@kde.org>
20
// Copyright (C) 2005 Nickolay V. Shmyrev <nshmyrev@yandex.ru>
21
// Copyright (C) 2006-2009 Carlos Garcia Campos <carlosgc@gnome.org>
22 23 24 25
// Copyright (C) 2008 Carl Worth <cworth@cworth.org>
// Copyright (C) 2008 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2008 Michael Vrable <mvrable@cs.ucsd.edu>
// Copyright (C) 2008 Chris Wilson <chris@chris-wilson.co.uk>
26
// Copyright (C) 2008 Hib Eris <hib@hiberis.nl>
27 28 29 30 31
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
Kristian Høgsberg's avatar
Kristian Høgsberg committed
32 33 34 35 36 37 38 39 40

#include <config.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <string.h>
#include <math.h>
41
#include <assert.h>
Kristian Høgsberg's avatar
Kristian Høgsberg committed
42 43 44 45 46 47 48 49 50 51 52
#include <cairo.h>

#include "goo/gfile.h"
#include "GlobalParams.h"
#include "Error.h"
#include "Object.h"
#include "GfxState.h"
#include "GfxFont.h"
#include "Link.h"
#include "CharCodeToUnicode.h"
#include "FontEncodingTables.h"
53
#include "PDFDocEncoding.h"
Kristian Høgsberg's avatar
Kristian Høgsberg committed
54 55 56 57 58 59
#include <fofi/FoFiTrueType.h>
#include <splash/SplashBitmap.h>
#include "CairoOutputDev.h"
#include "CairoFontEngine.h"
//------------------------------------------------------------------------

60
// #define LOG_CAIRO
Kristian Høgsberg's avatar
Kristian Høgsberg committed
61 62 63 64 65 66 67

#ifdef LOG_CAIRO
#define LOG(x) (x)
#else
#define LOG(x)
#endif

68 69 70 71 72 73
static inline void printMatrix(cairo_matrix_t *matrix){
	printf("%f %f, %f %f (%f %f)\n", matrix->xx, matrix->yx,
			matrix->xy, matrix->yy,
			matrix->x0, matrix->y0);
}

74 75 76 77
//------------------------------------------------------------------------
// CairoImage
//------------------------------------------------------------------------

78 79
CairoImage::CairoImage (double x1, double y1, double x2, double y2) {
  this->image = NULL;
80 81 82 83 84 85 86 87 88 89
  this->x1 = x1;
  this->y1 = y1;
  this->x2 = x2;
  this->y2 = y2;
}

CairoImage::~CairoImage () {
  if (image)
    cairo_surface_destroy (image);
}
Kristian Høgsberg's avatar
Kristian Høgsberg committed
90

91 92 93 94 95 96
void CairoImage::setImage (cairo_surface_t *image) {
  if (this->image)
    cairo_surface_destroy (this->image);
  this->image = cairo_surface_reference (image);
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
97 98 99 100
//------------------------------------------------------------------------
// CairoOutputDev
//------------------------------------------------------------------------

101 102 103 104 105 106 107 108 109
// We cannot tie the lifetime of an FT_Library object to that of
// CairoOutputDev, since any FT_Faces created with it may end up with a
// reference by Cairo which can be held long after the CairoOutputDev is
// deleted.  The simplest way to avoid problems is to never tear down the
// FT_Library instance; to avoid leaks, just use a single global instance
// initialized the first time it is needed.
FT_Library CairoOutputDev::ft_lib;
GBool CairoOutputDev::ft_lib_initialized = gFalse;

110
CairoOutputDev::CairoOutputDev() {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
111
  xref = NULL;
112
  catalog = NULL;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
113

114 115 116 117 118
  if (!ft_lib_initialized) {
    FT_Init_FreeType(&ft_lib);
    ft_lib_initialized = gTrue;
  }

Kristian Høgsberg's avatar
Kristian Høgsberg committed
119
  fontEngine = NULL;
120
  fontEngine_owner = gFalse;
121
  glyphs = NULL;
122 123
  fill_pattern = NULL;
  stroke_pattern = NULL;
124 125
  stroke_opacity = 1.0;
  fill_opacity = 1.0;
126
  textClipPath = NULL;
127
  cairo = NULL;
128
  currentFont = NULL;
129
  prescaleImages = gTrue;
130
  printing = gTrue;
131
  inType3Char = gFalse;
132
  t3_glyph_has_bbox = gFalse;
133 134

  groupColorSpaceStack = NULL;
135
  maskStack = NULL;
136 137
  group = NULL;
  mask = NULL;
138 139 140
  shape = NULL;
  cairo_shape = NULL;
  knockoutCount = 0;
141 142

  text = NULL;
143
  actualText = NULL;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
144 145 146
}

CairoOutputDev::~CairoOutputDev() {
147
  if (fontEngine_owner && fontEngine) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
148 149
    delete fontEngine;
  }
150

151 152
  if (cairo)
    cairo_destroy (cairo);
153 154
  cairo_pattern_destroy (stroke_pattern);
  cairo_pattern_destroy (fill_pattern);
155 156
  if (group)
    cairo_pattern_destroy (group);
Chris Wilson's avatar
Chris Wilson committed
157 158
  if (mask)
    cairo_pattern_destroy (mask);
159 160
  if (shape)
    cairo_pattern_destroy (shape);
161
  if (text) 
162 163 164
    text->decRefCnt();
  if (actualText)
    delete actualText;  
165
}
Kristian Høgsberg's avatar
Kristian Høgsberg committed
166

167
void CairoOutputDev::setCairo(cairo_t *cairo)
168
{
169 170 171 172 173
  if (this->cairo != NULL) {
    cairo_status_t status = cairo_status (this->cairo);
    if (status) {
      warning("cairo context error: %s\n", cairo_status_to_string(status));
    }
174
    cairo_destroy (this->cairo);
175
    assert(!cairo_shape);
176
  }
177
  if (cairo != NULL) {
178
    this->cairo = cairo_reference (cairo);
179 180 181 182
	/* save the initial matrix so that we can use it for type3 fonts. */
	//XXX: is this sufficient? could we miss changes to the matrix somehow?
	cairo_get_matrix(cairo, &orig_matrix);
  } else {
183
    this->cairo = NULL;
184
    this->cairo_shape = NULL;
185
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
186 187
}

188 189 190 191
void CairoOutputDev::setTextPage(TextPage *text)
{
  if (this->text) 
    this->text->decRefCnt();
192 193
  if (actualText)
    delete actualText;
194 195 196
  if (text) {
    this->text = text;
    this->text->incRefCnt();
197
    actualText = new ActualText(text);
198 199
  } else {
    this->text = NULL;
200
    actualText = NULL;
201 202 203
  }
}

204 205
void CairoOutputDev::startDoc(XRef *xrefA, Catalog *catalogA,
			      CairoFontEngine *parentFontEngine) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
206
  xref = xrefA;
207
  catalog = catalogA;
208 209 210 211 212 213 214 215
  if (parentFontEngine) {
    fontEngine = parentFontEngine;
  } else {
    if (fontEngine) {
      delete fontEngine;
    }
    fontEngine = new CairoFontEngine(ft_lib);
    fontEngine_owner = gTrue;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
216 217 218
  }
}

219 220 221 222 223 224 225
void CairoOutputDev::startPage(int pageNum, GfxState *state) {
  /* set up some per page defaults */
  cairo_pattern_destroy(fill_pattern);
  fill_pattern = cairo_pattern_create_rgb(0., 0., 0.);

  cairo_pattern_destroy(stroke_pattern);
  stroke_pattern = cairo_pattern_create_rgb(0., 0., 0.);
226 227 228 229 230 231 232 233 234 235

  if (text)
    text->startPage(state);
}

void CairoOutputDev::endPage() {
  if (text) {
    text->endPage();
    text->coalesce(gTrue, gFalse);
  }
236 237
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
238 239 240 241 242 243
void CairoOutputDev::drawLink(Link *link, Catalog *catalog) {
}

void CairoOutputDev::saveState(GfxState *state) {
  LOG(printf ("save\n"));
  cairo_save (cairo);
244 245
  if (cairo_shape)
      cairo_save (cairo_shape);
246 247 248 249 250

  MaskStack *ms = new MaskStack;
  ms->mask = cairo_pattern_reference(mask);
  ms->next = maskStack;
  maskStack = ms;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
251 252 253 254 255
}

void CairoOutputDev::restoreState(GfxState *state) {
  LOG(printf ("restore\n"));
  cairo_restore (cairo);
256 257
  if (cairo_shape)
      cairo_restore (cairo_shape);
258 259 260 261 262 263 264

  /* These aren't restored by cairo_restore() since we keep them in
   * the output device. */
  updateFillColor(state);
  updateStrokeColor(state);
  updateFillOpacity(state);
  updateStrokeOpacity(state);
265 266 267 268 269 270 271 272

  MaskStack* ms = maskStack;
  if (mask)
    cairo_pattern_destroy(mask);

  mask = ms->mask;
  maskStack = ms->next;
  delete ms;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
273 274 275 276 277 278 279 280 281 282 283
}

void CairoOutputDev::updateAll(GfxState *state) {
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
  updateFlatness(state);
  updateMiterLimit(state);
  updateFillColor(state);
  updateStrokeColor(state);
284 285
  updateFillOpacity(state);
  updateStrokeOpacity(state);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
286 287 288
  needFontUpdate = gTrue;
}

289 290 291 292 293 294 295 296 297
void CairoOutputDev::setDefaultCTM(double *ctm) {
  cairo_matrix_t matrix;
  matrix.xx = ctm[0];
  matrix.yx = ctm[1];
  matrix.xy = ctm[2];
  matrix.yy = ctm[3];
  matrix.x0 = ctm[4];
  matrix.y0 = ctm[5];

298
  cairo_transform (cairo, &matrix);
299
  if (cairo_shape)
300
      cairo_transform (cairo_shape, &matrix);
301 302 303 304

  OutputDev::setDefaultCTM(ctm);
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
305 306 307
void CairoOutputDev::updateCTM(GfxState *state, double m11, double m12,
				double m21, double m22,
				double m31, double m32) {
308
  cairo_matrix_t matrix, invert_matrix;
309 310 311 312 313 314 315
  matrix.xx = m11;
  matrix.yx = m12;
  matrix.xy = m21;
  matrix.yy = m22;
  matrix.x0 = m31;
  matrix.y0 = m32;

316 317 318 319 320 321 322 323
  /* Make sure the matrix is invertible before setting it.
   * cairo will blow up if we give it a matrix that's not
   * invertible, so we need to check before passing it
   * to cairo_transform. Ignoring it is likely to give better
   * results than not rendering anything at all. See #14398
   *
   * Ideally, we could do the cairo_transform
   * and then check if anything went wrong and fix it then
324 325 326
   * instead of having to invert the matrix. */
  invert_matrix = matrix;
  if (cairo_matrix_invert(&invert_matrix)) {
327 328 329 330
    warning("matrix not invertible\n");
    return;
  }

331
  cairo_transform (cairo, &matrix);
332 333
  if (cairo_shape)
    cairo_transform (cairo_shape, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
334 335 336 337 338 339 340 341 342 343 344 345
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
}

void CairoOutputDev::updateLineDash(GfxState *state) {
  double *dashPattern;
  int dashLength;
  double dashStart;

  state->getLineDash(&dashPattern, &dashLength, &dashStart);
346
  cairo_set_dash (cairo, dashPattern, dashLength, dashStart);
347 348
  if (cairo_shape)
    cairo_set_dash (cairo_shape, dashPattern, dashLength, dashStart);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
349 350 351
}

void CairoOutputDev::updateFlatness(GfxState *state) {
352
  // cairo_set_tolerance (cairo, state->getFlatness());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
353 354 355 356 357 358 359 360 361 362 363 364 365 366
}

void CairoOutputDev::updateLineJoin(GfxState *state) {
  switch (state->getLineJoin()) {
  case 0:
    cairo_set_line_join (cairo, CAIRO_LINE_JOIN_MITER);
    break;
  case 1:
    cairo_set_line_join (cairo, CAIRO_LINE_JOIN_ROUND);
    break;
  case 2:
    cairo_set_line_join (cairo, CAIRO_LINE_JOIN_BEVEL);
    break;
  }
367 368
  if (cairo_shape)
    cairo_set_line_join (cairo_shape, cairo_get_line_join(cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
369 370 371 372 373 374 375 376 377 378 379 380 381 382
}

void CairoOutputDev::updateLineCap(GfxState *state) {
  switch (state->getLineCap()) {
  case 0:
    cairo_set_line_cap (cairo, CAIRO_LINE_CAP_BUTT);
    break;
  case 1:
    cairo_set_line_cap (cairo, CAIRO_LINE_CAP_ROUND);
    break;
  case 2:
    cairo_set_line_cap (cairo, CAIRO_LINE_CAP_SQUARE);
    break;
  }
383 384
  if (cairo_shape)
    cairo_set_line_cap (cairo_shape, cairo_get_line_cap(cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
385 386 387 388
}

void CairoOutputDev::updateMiterLimit(GfxState *state) {
  cairo_set_miter_limit (cairo, state->getMiterLimit());
389 390
  if (cairo_shape)
    cairo_set_miter_limit (cairo_shape, state->getMiterLimit());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
391 392
}

393
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
394

Kristian Høgsberg's avatar
Kristian Høgsberg committed
395
void CairoOutputDev::updateLineWidth(GfxState *state) {
396 397
  LOG(printf ("line width: %f\n", state->getLineWidth()));
  if (state->getLineWidth() == 0.0) {
398 399 400 401 402
    /* find out how big pixels (device unit) are in the x and y directions
     * choose the smaller of the two as our line width */
    double x = 1.0, y = 1.0;
    cairo_device_to_user_distance(cairo, &x, &y);
    cairo_set_line_width (cairo, MIN(fabs(x),fabs(y)));
403
  } else {
404
    cairo_set_line_width (cairo, state->getLineWidth());
405
  }
406 407
  if (cairo_shape)
    cairo_set_line_width (cairo_shape, cairo_get_line_width (cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
408 409 410 411
}

void CairoOutputDev::updateFillColor(GfxState *state) {
  state->getFillRGB(&fill_color);
412 413 414 415 416 417 418 419 420

  cairo_pattern_destroy(fill_pattern);
  fill_pattern = cairo_pattern_create_rgba(fill_color.r / 65535.0,
					   fill_color.g / 65535.0,
					   fill_color.b / 65535.0,
					   fill_opacity);

  LOG(printf ("fill color: %d %d %d\n",
	      fill_color.r, fill_color.g, fill_color.b));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
421 422 423 424
}

void CairoOutputDev::updateStrokeColor(GfxState *state) {
  state->getStrokeRGB(&stroke_color);
425 426 427 428 429 430 431 432 433

  cairo_pattern_destroy(stroke_pattern);
  stroke_pattern = cairo_pattern_create_rgba(stroke_color.r / 65535.0,
					     stroke_color.g / 65535.0,
					     stroke_color.b / 65535.0,
					     stroke_opacity);
  
  LOG(printf ("stroke color: %d %d %d\n",
	      stroke_color.r, stroke_color.g, stroke_color.b));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
434 435
}

436 437
void CairoOutputDev::updateFillOpacity(GfxState *state) {
  fill_opacity = state->getFillOpacity();
438 439 440 441 442 443 444

  cairo_pattern_destroy(fill_pattern);
  fill_pattern = cairo_pattern_create_rgba(fill_color.r / 65535.0,
					   fill_color.g / 65535.0,
					   fill_color.b / 65535.0,
					   fill_opacity);

445 446 447 448 449
  LOG(printf ("fill opacity: %f\n", fill_opacity));
}

void CairoOutputDev::updateStrokeOpacity(GfxState *state) {
  stroke_opacity = state->getStrokeOpacity();
450 451 452 453 454 455 456

  cairo_pattern_destroy(stroke_pattern);
  stroke_pattern = cairo_pattern_create_rgba(stroke_color.r / 65535.0,
					     stroke_color.g / 65535.0,
					     stroke_color.b / 65535.0,
					     stroke_opacity);
  
457 458 459
  LOG(printf ("stroke opacity: %f\n", stroke_opacity));
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
460
void CairoOutputDev::updateFont(GfxState *state) {
461
  cairo_font_face_t *font_face;
462
  cairo_matrix_t matrix, invert_matrix;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
463 464

  LOG(printf ("updateFont() font=%s\n", state->getFont()->getName()->getCString()));
465

Kristian Høgsberg's avatar
Kristian Høgsberg committed
466 467
  needFontUpdate = gFalse;

468 469 470 471
  //FIXME: use cairo font engine?
  if (text)
    text->updateFont(state);
  
472
  currentFont = fontEngine->getFont (state->getFont(), xref, catalog, printing);
473

474 475
  if (!currentFont)
    return;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
476

477
  LOG(printf ("font matrix: %f %f %f %f\n", m11, m12, m21, m22));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
478
  
479 480
  font_face = currentFont->getFontFace();
  cairo_set_font_face (cairo, font_face);
481 482 483
 
  double fontSize = state->getFontSize();
  double *m = state->getTextMat();
484 485 486 487 488 489
  /* NOTE: adjusting by a constant is hack. The correct solution
   * is probably to use user-fonts and compute the scale on a per
   * glyph basis instead of for the entire font */
  double w = currentFont->getSubstitutionCorrection(state->getFont());
  matrix.xx = m[0] * fontSize * state->getHorizScaling() * w;
  matrix.yx = m[1] * fontSize * state->getHorizScaling() * w;
490 491
  matrix.xy = -m[2] * fontSize;
  matrix.yy = -m[3] * fontSize;
492 493
  matrix.x0 = 0;
  matrix.y0 = 0;
494 495 496 497 498 499 500 501 502 503 504 505 506

 /* Make sure the font matrix is invertible before setting it.  cairo
  * will blow up if we give it a matrix that's not invertible, so we
  * need to check before passing it to cairo_set_font_matrix. Ignoring it
  * is likely to give better results than not rendering anything at
  * all. See #18254.
  */
  invert_matrix = matrix;
  if (cairo_matrix_invert(&invert_matrix)) {
    warning("font matrix not invertible\n");
    return;
  }

507
  cairo_set_font_matrix (cairo, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
508 509
}

510
void CairoOutputDev::doPath(cairo_t *cairo, GfxState *state, GfxPath *path) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
511 512 513 514 515
  GfxSubpath *subpath;
  int i, j;
  for (i = 0; i < path->getNumSubpaths(); ++i) {
    subpath = path->getSubpath(i);
    if (subpath->getNumPoints() > 0) {
516 517
      cairo_move_to (cairo, subpath->getX(0), subpath->getY(0));
         j = 1;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
518 519
      while (j < subpath->getNumPoints()) {
	if (subpath->getCurve(j)) {
520 521 522 523 524
	  cairo_curve_to( cairo,
			  subpath->getX(j), subpath->getY(j),
			  subpath->getX(j+1), subpath->getY(j+1),
			  subpath->getX(j+2), subpath->getY(j+2));

Kristian Høgsberg's avatar
Kristian Høgsberg committed
525 526
	  j += 3;
	} else {
527
	  cairo_line_to (cairo, subpath->getX(j), subpath->getY(j));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
528 529 530 531 532 533 534 535 536 537 538 539
	  ++j;
	}
      }
      if (subpath->isClosed()) {
	LOG (printf ("close\n"));
	cairo_close_path (cairo);
      }
    }
  }
}

void CairoOutputDev::stroke(GfxState *state) {
540
  doPath (cairo, state, state->getPath());
541
  cairo_set_source (cairo, stroke_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
542 543
  LOG(printf ("stroke\n"));
  cairo_stroke (cairo);
544 545 546 547
  if (cairo_shape) {
    doPath (cairo_shape, state, state->getPath());
    cairo_stroke (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
548 549 550
}

void CairoOutputDev::fill(GfxState *state) {
551
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
552
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);
553
  cairo_set_source (cairo, fill_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
554
  LOG(printf ("fill\n"));
555
  //XXX: how do we get the path
Kristian Høgsberg's avatar
Kristian Høgsberg committed
556
  cairo_fill (cairo);
557 558 559 560 561
  if (cairo_shape) {
    cairo_set_fill_rule (cairo_shape, CAIRO_FILL_RULE_WINDING);
    doPath (cairo_shape, state, state->getPath());
    cairo_fill (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
562 563 564
}

void CairoOutputDev::eoFill(GfxState *state) {
565
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
566
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_EVEN_ODD);
567
  cairo_set_source (cairo, fill_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
568 569
  LOG(printf ("fill-eo\n"));
  cairo_fill (cairo);
570 571 572 573 574 575 576

  if (cairo_shape) {
    cairo_set_fill_rule (cairo_shape, CAIRO_FILL_RULE_EVEN_ODD);
    doPath (cairo_shape, state, state->getPath());
    cairo_fill (cairo_shape);
  }

Kristian Høgsberg's avatar
Kristian Høgsberg committed
577 578
}

579
void CairoOutputDev::clip(GfxState *state) {
580
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
581 582 583
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);
  cairo_clip (cairo);
  LOG (printf ("clip\n"));
584 585 586 587 588
  if (cairo_shape) {
    doPath (cairo_shape, state, state->getPath());
    cairo_set_fill_rule (cairo_shape, CAIRO_FILL_RULE_WINDING);
    cairo_clip (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
589 590 591
}

void CairoOutputDev::eoClip(GfxState *state) {
592
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
593 594 595
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_EVEN_ODD);
  cairo_clip (cairo);
  LOG (printf ("clip-eo\n"));
596 597 598 599 600 601
  if (cairo_shape) {
    doPath (cairo_shape, state, state->getPath());
    cairo_set_fill_rule (cairo_shape, CAIRO_FILL_RULE_EVEN_ODD);
    cairo_clip (cairo_shape);
  }

Kristian Høgsberg's avatar
Kristian Høgsberg committed
602 603
}

604
void CairoOutputDev::beginString(GfxState *state, GooString *s)
605 606
{
  int len = s->getLength();
607

608 609 610
  if (needFontUpdate)
    updateFont(state);

611 612 613
  if (!currentFont)
    return;

614
  glyphs = (cairo_glyph_t *) gmallocn (len, sizeof (cairo_glyph_t));
615 616 617 618 619 620
  glyphCount = 0;
}

void CairoOutputDev::drawChar(GfxState *state, double x, double y,
			      double dx, double dy,
			      double originX, double originY,
621
			      CharCode code, int nBytes, Unicode *u, int uLen)
622
{
623 624 625 626 627 628 629 630
  if (currentFont) {
    glyphs[glyphCount].index = currentFont->getGlyph (code, u, uLen);
    glyphs[glyphCount].x = x - originX;
    glyphs[glyphCount].y = y - originY;
    glyphCount++;
  }

  if (!text)
631
    return;
632
  actualText->addChar (state, x, y, dx, dy, code, nBytes, u, uLen);
633 634 635 636 637 638 639
}

void CairoOutputDev::endString(GfxState *state)
{
  int render;

  if (!currentFont)
Kristian Høgsberg's avatar
Kristian Høgsberg committed
640
    return;
641 642 643 644 645 646 647

  // endString can be called without a corresponding beginString. If this
  // happens glyphs will be null so don't draw anything, just return.
  // XXX: OutputDevs should probably not have to deal with this...
  if (!glyphs)
    return;

648 649
  // ignore empty strings and invisible text -- this is used by
  // Acrobat Capture
Kristian Høgsberg's avatar
Kristian Høgsberg committed
650
  render = state->getRender();
651
  if (render == 3 || glyphCount == 0) {
652 653
    gfree(glyphs);
    glyphs = NULL;
654
    return;
655
  }
656
  
Kristian Høgsberg's avatar
Kristian Høgsberg committed
657
  if (!(render & 1)) {
658
    LOG (printf ("fill string\n"));
659
    cairo_set_source (cairo, fill_pattern);
660
    cairo_show_glyphs (cairo, glyphs, glyphCount);
661 662
    if (cairo_shape)
      cairo_show_glyphs (cairo_shape, glyphs, glyphCount);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
663
  }
664
  
Kristian Høgsberg's avatar
Kristian Høgsberg committed
665 666
  // stroke
  if ((render & 3) == 1 || (render & 3) == 2) {
667
    LOG (printf ("stroke string\n"));
668
    cairo_set_source (cairo, stroke_pattern);
669
    cairo_glyph_path (cairo, glyphs, glyphCount);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
670
    cairo_stroke (cairo);
671 672 673 674
    if (cairo_shape) {
      cairo_glyph_path (cairo_shape, glyphs, glyphCount);
      cairo_stroke (cairo_shape);
    }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
675 676 677 678
  }

  // clip
  if (render & 4) {
679
    LOG (printf ("clip string\n"));
680 681 682 683 684
    // append the glyph path to textClipPath.

    // set textClipPath as the currentPath
    if (textClipPath) {
      cairo_append_path (cairo, textClipPath);
685 686 687
      if (cairo_shape) {
	cairo_append_path (cairo_shape, textClipPath);
      }
688 689 690 691
      cairo_path_destroy (textClipPath);
    }
    
    // append the glyph path
692
    cairo_glyph_path (cairo, glyphs, glyphCount);
693 694 695 696 697
   
    // move the path back into textClipPath 
    // and clear the current path
    textClipPath = cairo_copy_path (cairo);
    cairo_new_path (cairo);
698 699 700
    if (cairo_shape) {
      cairo_new_path (cairo_shape);
    }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
701
  }
702

703
  gfree (glyphs);
704
  glyphs = NULL;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
705 706
}

707

Kristian Høgsberg's avatar
Kristian Høgsberg committed
708 709 710
GBool CairoOutputDev::beginType3Char(GfxState *state, double x, double y,
				      double dx, double dy,
				      CharCode code, Unicode *u, int uLen) {
711 712 713 714 715 716 717 718 719 720 721 722

  cairo_save (cairo);
  double *ctm;
  cairo_matrix_t matrix;

  ctm = state->getCTM();
  matrix.xx = ctm[0];
  matrix.yx = ctm[1];
  matrix.xy = ctm[2];
  matrix.yy = ctm[3];
  matrix.x0 = ctm[4];
  matrix.y0 = ctm[5];
723 724 725 726
  /* Restore the original matrix and then transform to matrix needed for the
   * type3 font. This is ugly but seems to work. Perhaps there is a better way to do it?*/
  cairo_set_matrix(cairo, &orig_matrix);
  cairo_transform(cairo, &matrix);
727 728 729 730 731
  if (cairo_shape) {
    cairo_save (cairo_shape);
    cairo_set_matrix(cairo_shape, &orig_matrix);
    cairo_transform(cairo_shape, &matrix);
  }
732 733
  cairo_pattern_destroy(stroke_pattern);
  cairo_pattern_reference(fill_pattern);
734
  stroke_pattern = fill_pattern;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
735 736 737 738
  return gFalse;
}

void CairoOutputDev::endType3Char(GfxState *state) {
739
  cairo_restore (cairo);
740 741 742
  if (cairo_shape) {
    cairo_restore (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
743 744 745
}

void CairoOutputDev::type3D0(GfxState *state, double wx, double wy) {
746 747
  t3_glyph_wx = wx;
  t3_glyph_wy = wy;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
748 749 750
}

void CairoOutputDev::type3D1(GfxState *state, double wx, double wy,
751
			     double llx, double lly, double urx, double ury) {
752 753 754 755 756 757 758
  t3_glyph_wx = wx;
  t3_glyph_wy = wy;
  t3_glyph_bbox[0] = llx;
  t3_glyph_bbox[1] = lly;
  t3_glyph_bbox[2] = urx;
  t3_glyph_bbox[3] = ury;
  t3_glyph_has_bbox = gTrue;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
759 760 761
}

void CairoOutputDev::endTextObject(GfxState *state) {
762 763 764 765
  if (textClipPath) {
    // clip the accumulated text path
    cairo_append_path (cairo, textClipPath);
    cairo_clip (cairo);
766 767 768 769
    if (cairo_shape) {
      cairo_append_path (cairo_shape, textClipPath);
      cairo_clip (cairo_shape);
    }
770 771 772
    cairo_path_destroy (textClipPath);
    textClipPath = NULL;
  }
773
}
774

775 776
void CairoOutputDev::beginMarkedContent(char *name, Dict *properties)
{
777 778
  if (text)
    actualText->beginMC(properties);
779 780 781 782
}

void CairoOutputDev::endMarkedContent(GfxState *state)
{
783 784
  if (text)
    actualText->endMC(state);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
785 786
}

787 788 789 790 791 792 793 794 795 796 797 798
static inline int splashRound(SplashCoord x) {
  return (int)floor(x + 0.5);
}

static inline int splashCeil(SplashCoord x) {
  return (int)ceil(x);
}

static inline int splashFloor(SplashCoord x) {
  return (int)floor(x);
}

799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828
static
cairo_surface_t *cairo_surface_create_similar_clip (cairo_t *cairo, cairo_content_t content)
{
  double x1, y1, x2, y2;
  int width, height;
  cairo_clip_extents (cairo, &x1, &y1, &x2, &y2);
  cairo_matrix_t matrix;
  cairo_get_matrix (cairo, &matrix);
  //cairo_matrix_transform_point(&matrix, &x1, &y1);
  //cairo_matrix_transform_point(&matrix, &x2, &y2);*/
  cairo_user_to_device(cairo, &x1, &y1);
  cairo_user_to_device(cairo, &x2, &y2);
  width = splashCeil(x2) - splashFloor(x1);
  //XXX: negative matrix
  ////height = splashCeil(y2) - splashFloor(y1);
  height = splashFloor(y1) - splashCeil(y2);
  cairo_surface_t *target = cairo_get_target (cairo);
  cairo_surface_t *result;

  result = cairo_surface_create_similar (target, content, width, height);
  double x_offset, y_offset;
    cairo_surface_get_device_offset(target, &x_offset, &y_offset);
    cairo_surface_set_device_offset(result, x_offset, y_offset);

 
  return result;
}



829 830
void CairoOutputDev::beginTransparencyGroup(GfxState * /*state*/, double * /*bbox*/,
                                      GfxColorSpace * blendingColorSpace,
831
                                      GBool /*isolated*/, GBool knockout,
832 833 834 835
				      GBool forSoftMask) {
  /* push color space */
  ColorSpaceStack* css = new ColorSpaceStack;
  css->cs = blendingColorSpace;
836
  css->knockout = knockout;
837 838
  css->next = groupColorSpaceStack;
  groupColorSpaceStack = css;
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
  if (knockout) {
    knockoutCount++;
    if (!cairo_shape) {
      /* create a surface for tracking the shape */
      cairo_surface_t *cairo_shape_surface = cairo_surface_create_similar_clip (cairo, CAIRO_CONTENT_ALPHA);
      cairo_shape = cairo_create (cairo_shape_surface);
      cairo_surface_destroy (cairo_shape_surface);

      /* the color doesn't matter as long as it is opaque */
      cairo_set_source_rgb (cairo_shape, 0, 0, 0);
      cairo_matrix_t matrix;
      cairo_get_matrix (cairo, &matrix);
      //printMatrix(&matrix);
      cairo_set_matrix (cairo_shape, &matrix);
    } else {
      cairo_reference (cairo_shape);
    }
  }
  if (groupColorSpaceStack->next && groupColorSpaceStack->next->knockout) {
    /* we need to track the shape */
    cairo_push_group (cairo_shape);
  }
861 862 863 864
  if (0 && forSoftMask)
    cairo_push_group_with_content (cairo, CAIRO_CONTENT_ALPHA);
  else
    cairo_push_group (cairo);
865 866 867 868 869 870 871 872

  /* push_group has an implicit cairo_save() */
  if (knockout) {
    /*XXX: let's hope this matches the semantics needed */
    cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
  } else {
    cairo_set_operator(cairo, CAIRO_OPERATOR_OVER);
  }
873
}
874

875
void CairoOutputDev::endTransparencyGroup(GfxState * /*state*/) {
876

877 878 879
  if (group)
    cairo_pattern_destroy(group);
  group = cairo_pop_group (cairo);
880 881 882 883 884 885

  if (groupColorSpaceStack->next && groupColorSpaceStack->next->knockout) {
    if (shape)
      cairo_pattern_destroy(shape);
    shape = cairo_pop_group (cairo_shape);
  }
886
}
887

888 889 890 891
void CairoOutputDev::paintTransparencyGroup(GfxState * /*state*/, double * /*bbox*/) {
  cairo_set_source (cairo, group);

  if (!mask) {
892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
    //XXX: deal with mask && shape case
    if (shape) {
      cairo_save (cairo);

      /* OPERATOR_SOURCE w/ a mask is defined as (src IN mask) ADD (dest OUT mask)
       * however our source has already been clipped to mask so we only need to
       * do ADD and OUT */

      /* clear the shape mask */
      cairo_set_source (cairo, shape);
      cairo_set_operator (cairo, CAIRO_OPERATOR_DEST_OUT);
      cairo_paint (cairo);

      cairo_set_operator (cairo, CAIRO_OPERATOR_ADD);
      cairo_set_source (cairo, group);
      cairo_paint (cairo);

      cairo_restore (cairo);

      cairo_pattern_destroy (shape);
      shape = NULL;
    } else {
      cairo_paint_with_alpha (cairo, fill_opacity);
    }
    cairo_status_t status = cairo_status(cairo);
    if (status)
      printf("BAD status: %s\n", cairo_status_to_string(status));
919 920 921 922 923 924 925
  } else {
    cairo_mask(cairo, mask);

    cairo_pattern_destroy(mask);
    mask = NULL;
  }

926
  popTransparencyGroup();
927 928 929 930 931 932 933 934 935
}

typedef unsigned int uint32_t;

static uint32_t luminocity(uint32_t x)
{
  int r = (x >> 16) & 0xff;
  int g = (x >>  8) & 0xff;
  int b = (x >>  0) & 0xff;
936 937
  // an arbitrary integer approximation of .3*r + .59*g + .11*b
  int y = (r*19661+g*38666+b*7209 + 32829)>>16;
938 939 940 941
  return y << 24;
}


942
/* XXX: do we need to deal with shape here? */
943 944
void CairoOutputDev::setSoftMask(GfxState * state, double * bbox, GBool alpha,
                                 Function * transferFunc, GfxColor * backdropColor) {
Chris Wilson's avatar
Chris Wilson committed
945 946
  cairo_pattern_destroy(mask);

947 948 949 950 951
  if (alpha == false) {
    /* We need to mask according to the luminocity of the group.
     * So we paint the group to an image surface convert it to a luminocity map
     * and then use that as the mask. */

952
    double x1, y1, x2, y2, tmp;
953
    cairo_clip_extents(cairo, &x1, &y1, &x2, &y2);
954 955 956 957 958 959 960 961 962 963 964 965 966 967
    cairo_user_to_device(cairo, &x1, &y1);
    cairo_user_to_device(cairo, &x2, &y2);
    if (x1 > x2) {
      tmp = x1;
      x1 = x2;
      x2 = tmp;
    }

    if (y1 > y2) {
      tmp = y1;
      y1 = y2;
      y2 = tmp;
    }

968 969
    int width = (int)(ceil(x2) - floor(x1));
    int height = (int)(ceil(y2) - floor(y1));
970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997

    cairo_surface_t *source = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
    cairo_t *maskCtx = cairo_create(source);

    //XXX: hopefully this uses the correct color space */
    GfxRGB backdropColorRGB;
    groupColorSpaceStack->cs->getRGB(backdropColor, &backdropColorRGB);
    /* paint the backdrop */
    cairo_set_source_rgb(maskCtx, backdropColorRGB.r / 65535.0,
			 backdropColorRGB.g / 65535.0,
			 backdropColorRGB.b / 65535.0);


    cairo_matrix_t mat;
    cairo_get_matrix(cairo, &mat);
    cairo_set_matrix(maskCtx, &mat);

    /* make the device offset of the new mask match that of the group */
    double x_offset, y_offset;
    cairo_surface_t *pats;
    cairo_pattern_get_surface(group, &pats);
    cairo_surface_get_device_offset(pats, &x_offset, &y_offset);
    cairo_surface_set_device_offset(source, x_offset, y_offset);

    /* paint the group */
    cairo_set_source(maskCtx, group);
    cairo_paint(maskCtx);

Chris Wilson's avatar
Chris Wilson committed
998 999 1000
    /* XXX status = cairo_status(maskCtx); */
    cairo_destroy(maskCtx);

1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
    /* convert to a luminocity map */
    uint32_t *source_data = (uint32_t*)cairo_image_surface_get_data(source);
    /* get stride in units of 32 bits */
    int stride = cairo_image_surface_get_stride(source)/4;
    for (int y=0; y<height; y++) {
      for (int x=0; x<width; x++) {
	source_data[y*stride + x] = luminocity(source_data[y*stride + x]);

#if 0
	here is how splash deals with the transferfunction we should deal with this
	  at some point
	if (transferFunc) {
	  transferFunc->transform(&lum, &lum2);
	} else {
	  lum2 = lum;
	}
	p[x] = (int)(lum2 * 255.0 + 0.5);
#endif

      }
    }

    /* setup the new mask pattern */
    mask = cairo_pattern_create_for_surface(source);
    cairo_matrix_t patMatrix;
    cairo_pattern_get_matrix(group, &patMatrix);
    cairo_pattern_set_matrix(mask, &patMatrix);

    cairo_surface_destroy(source);
  } else {
Chris Wilson's avatar
Chris Wilson committed
1031
    mask = cairo_pattern_reference(group);
1032
  }
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050

  popTransparencyGroup();
}

void CairoOutputDev::popTransparencyGroup() {
  /* pop color space */
  ColorSpaceStack *css = groupColorSpaceStack;
  if (css->knockout) {
    knockoutCount--;
    if (!knockoutCount) {
      /* we don't need to track the shape anymore because
       * we are not above any knockout groups */
      cairo_destroy(cairo_shape);
      cairo_shape = NULL;
    }
  }
  groupColorSpaceStack = css->next;
  delete css;
1051 1052
}

1053

1054
void CairoOutputDev::clearSoftMask(GfxState * /*state*/) {
1055 1056 1057
  if (mask)
    cairo_pattern_destroy(mask);
  mask = NULL;
1058
}
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1059 1060 1061 1062

void CairoOutputDev::drawImageMask(GfxState *state, Object *ref, Stream *str,
				    int width, int height, GBool invert,
				    GBool inlineImg) {
1063

1064 1065 1066 1067
  /* FIXME: Doesn't the image mask support any colorspace? */
  cairo_set_source (cairo, fill_pattern);

  /* work around a cairo bug when scaling 1x1 surfaces */
1068 1069
  if (width == 1 && height == 1) {
    cairo_save (cairo);
1070
    cairo_rectangle (cairo, 0., 0., width, height);
1071 1072
    cairo_fill (cairo);
    cairo_restore (cairo);
1073 1074 1075 1076 1077 1078
    if (cairo_shape) {
      cairo_save (cairo_shape);
      cairo_rectangle (cairo_shape, 0., 0., width, height);
      cairo_fill (cairo_shape);
      cairo_restore (cairo_shape);
    }
1079 1080 1081
    return;
  }

1082 1083
  /* shape is 1.0 for painted areas, 0.0 for unpainted ones */

1084 1085
  cairo_matrix_t matrix;
  cairo_get_matrix (cairo, &matrix);
1086 1087
  //XXX: it is possible that we should only do sub pixel positioning if 
  // we are rendering fonts */
1088
  if (!printing && prescaleImages && matrix.xy == 0.0 && matrix.yx == 0.0) {
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
    drawImageMaskPrescaled(state, ref, str, width, height, invert, inlineImg);
  } else {
    drawImageMaskRegular(state, ref, str, width, height, invert, inlineImg);
  }
}

void CairoOutputDev::drawImageMaskRegular(GfxState *state, Object *ref, Stream *str,
				    int width, int height, GBool invert,
				    GBool inlineImg) {
  unsigned char *buffer;
  unsigned char *dest;
  cairo_surface_t *image;
  cairo_pattern_t *pattern;
  int x, y;
  ImageStream *imgStr;
  Guchar *pix;
  cairo_matrix_t matrix;
  int invert_bit;
  int row_stride;

1109 1110
  row_stride = (width + 3) & ~3;
  buffer = (unsigned char *) malloc (height * row_stride);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1111 1112 1113 1114 1115 1116
  if (buffer == NULL) {
    error(-1, "Unable to allocate memory for image.");
    return;
  }

  /* TODO: Do we want to cache these? */
1117
  imgStr = new ImageStream(str, width, 1, 1);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1118 1119
  imgStr->reset();

1120 1121
  invert_bit = invert ? 1 : 0;

Kristian Høgsberg's avatar
Kristian Høgsberg committed
1122
  for (y = 0; y < height; y++) {
1123
    pix = imgStr->getLine();
1124
    dest = buffer + y * row_stride;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1125
    for (x = 0; x < width; x++) {
1126 1127

      if (pix[x] ^ invert_bit)
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1128
	*dest++ = 0;
1129 1130
      else
	*dest++ = 255;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1131 1132 1133
    }
  }

1134
  image = cairo_image_surface_create_for_data (buffer, CAIRO_FORMAT_A8,
1135
					       width, height, row_stride);
1136
  if (image == NULL) {
1137
    imgStr->close();
1138
    delete imgStr;
1139
    return;
1140
  }
1141
  pattern = cairo_pattern_create_for_surface (image);
1142
  if (pattern == NULL) {
1143
    imgStr->close();
1144
    delete imgStr;
1145
    return;
1146
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1147

1148 1149 1150
  cairo_matrix_init_translate (&matrix, 0, height);
  cairo_matrix_scale (&matrix, width, -height);

1151
  cairo_pattern_set_matrix (pattern, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1152

1153 1154 1155
  /* we should actually be using CAIRO_FILTER_NEAREST here. However,
   * cairo doesn't yet do minifaction filtering causing scaled down
   * images with CAIRO_FILTER_NEAREST to look really bad */
1156
  cairo_pattern_set_filter (pattern, CAIRO_FILTER_BEST);
1157

1158
  cairo_mask (cairo, pattern);
1159

1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
  if (cairo_shape) {
#if 0
    cairo_rectangle (cairo_shape, 0., 0., width, height);
    cairo_fill (cairo_shape);
#else
    cairo_save (cairo_shape);
    /* this should draw a rectangle the size of the image
     * we use this instead of rect,fill because of the lack
     * of EXTEND_PAD */
    /* NOTE: this will multiply the edges of the image twice */
    cairo_set_source (cairo_shape, pattern);
    cairo_mask (cairo_shape, pattern);
    cairo_restore (cairo_shape);
#endif
  }


1177
  cairo_pattern_destroy (pattern);
1178 1179
  cairo_surface_destroy (image);
  free (buffer);
1180
  imgStr->close();
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
  delete imgStr;
}


void CairoOutputDev::drawImageMaskPrescaled(GfxState *state, Object *ref, Stream *str,
				    int width, int height, GBool invert,
				    GBool inlineImg) {
  unsigned char *buffer;
  cairo_surface_t *image;
  cairo_pattern_t *pattern;
  ImageStream *imgStr;
  Guchar *pix;
  cairo_matrix_t matrix;
  int invert_bit;
  int row_stride;

  /* cairo does a very poor job of scaling down images so we scale them ourselves */

  /* this scaling code is adopted from the splash image scaling code */
  cairo_get_matrix(cairo, &matrix);
#if 0
  printf("[%f %f], [%f %f], %f %f\n", matrix.xx, matrix.xy, matrix.yx, matrix.yy, matrix.x0, matrix.y0);
#endif
1204
  /* this whole computation should be factored out */
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
  double xScale = matrix.xx;
  double yScale = matrix.yy;
  int tx, tx2, ty, ty2; /* the integer co-oridinates of the resulting image */
  int scaledHeight;
  int scaledWidth;
  if (xScale >= 0) {
    tx = splashRound(matrix.x0 - 0.01);
    tx2 = splashRound(matrix.x0 + xScale + 0.01) - 1;
  } else {
    tx = splashRound(matrix.x0 + 0.01) - 1;
    tx2 = splashRound(matrix.x0 + xScale - 0.01);
  }
  scaledWidth = abs(tx2 - tx) + 1;
  //scaledWidth = splashRound(fabs(xScale));
  if (scaledWidth == 0) {
    // technically, this should draw nothing, but it generally seems
    // better to draw a one-pixel-wide stripe rather than throwing it
    // away
    scaledWidth = 1;
  }
  if (yScale >= 0) {
    ty = splashFloor(matrix.y0 + 0.01);
    ty2 = splashCeil(matrix.y0 + yScale - 0.01);
  } else {
    ty = splashCeil(matrix.y0 - 0.01);
    ty2 = splashFloor(matrix.y0 + yScale + 0.01);
  }
  scaledHeight = abs(ty2 - ty);
1233 1234 1235
  if (scaledHeight == 0) {
    scaledHeight = 1;
  }
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250
#if 0
  printf("xscale: %g, yscale: %g\n", xScale, yScale);
  printf("width: %d, height: %d\n", width, height);
  printf("scaledWidth: %d, scaledHeight: %d\n", scaledWidth, scaledHeight);
#endif

  /* compute the required padding */
  /* Padding is used to preserve the aspect ratio.
     We compute total_pad to make (height+total_pad)/scaledHeight as close to height/yScale as possible */
  int head_pad = 0;
  int tail_pad = 0;
  int total_pad = splashRound(height*(scaledHeight/fabs(yScale)) - height);

  /* compute the two pieces of padding */
  if (total_pad > 0) {
1251 1252 1253
    //XXX: i'm not positive fabs() is correct
    float tail_error = fabs(matrix.y0 - ty);
    float head_error = fabs(ty2 - (matrix.y0 + yScale));
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
    float tail_fraction = tail_error/(tail_error + head_error);
    tail_pad = splashRound(total_pad*tail_fraction);
    head_pad = total_pad - tail_pad;
  } else {
    tail_pad = 0;
    head_pad = 0;
  }
  int origHeight = height;
  height += tail_pad;
  height += head_pad;
#if 0
  printf("head_pad: %d tail_pad: %d\n", head_pad, tail_pad);
  printf("origHeight: %d height: %d\n", origHeight, height);
  printf("ty: %d, ty2: %d\n", ty, ty2);
#endif

  /* TODO: Do we want to cache these? */
  imgStr = new ImageStream(str, width, 1, 1);
  imgStr->reset();

  invert_bit = invert ? 1 : 0;

  row_stride = (scaledWidth + 3) & ~3;
  buffer = (unsigned char *) malloc (scaledHeight * row_stride);
  if (buffer == NULL) {
    error(-1, "Unable to allocate memory for image.");
    return;
  }

  int yp = height / scaledHeight;
  int yq = height % scaledHeight;
  int xp = width / scaledWidth;
  int xq = width % scaledWidth;
  int yt = 0;
  int origHeight_c = origHeight;
  /* use MIN() because yp might be > origHeight because of padding */
  unsigned char *pixBuf = (unsigned char *)malloc(MIN(yp+1, origHeight)*width);
  int lastYStep = 1;
  int total = 0;
  for (int y = 0; y < scaledHeight; y++) {
    // y scale Bresenham
    int yStep = yp;
    yt += yq;

    if (yt >= scaledHeight) {
      yt -= scaledHeight;
      ++yStep;
    }

    // read row (s) from image ignoring the padding as appropriate
    {
      int n = (yp > 0) ? yStep : lastYStep;
      total += n;
      if (n > 0) {
	unsigned char *p = pixBuf;
	int head_pad_count = head_pad;
	int origHeight_count = origHeight;
	int tail_pad_count = tail_pad;
	for (int i=0; i<n; i++) {
	  // get row
	  if (head_pad_count) {
	    head_pad_count--;
	  } else if (origHeight_count) {
	    pix = imgStr->getLine();
	    for (int j=0; j<width; j++) {
	      if (pix[j] ^ invert_bit)
		p[j] = 0;
	      else
		p[j] = 255;
	    }
	    origHeight_count--;
	    p += width;
	  } else if (tail_pad_count) {
	    tail_pad_count--;
	  } else {
	    printf("%d %d\n", n, total);
	    assert(0 && "over run\n");
	  }
	}
      }
    }

    lastYStep = yStep;
    int k1 = y;

    int xt = 0;
    int xSrc = 0;
    int x1 = k1;
    int n = yStep > 0 ? yStep : 1;
    int origN = n;

    /* compute the size of padding and pixels that will be used for this row */
    int head_pad_size = MIN(n, head_pad);
    n -= head_pad_size;
    head_pad -= MIN(head_pad_size, yStep);

    int pix_size = MIN(n, origHeight);
    n -= pix_size;
    origHeight -= MIN(pix_size, yStep);

    int tail_pad_size = MIN(n, tail_pad);
    n -= tail_pad_size;
    tail_pad -= MIN(tail_pad_size, yStep);
    if (n != 0) {
      printf("n = %d (%d %d %d)\n", n, head_pad_size, pix_size, tail_pad_size);
      assert(n == 0);
    }

    for (int x = 0; x < scaledWidth; ++x) {
      int xStep = xp;
      xt += xq;
      if (xt >= scaledWidth) {
	xt -= scaledWidth;
	++xStep;
      }
      int m = xStep > 0 ? xStep : 1;
      float pixAcc0 = 0;
      /* could m * head_pad_size * tail_pad_size  overflow? */
      if (invert_bit) {
	pixAcc0 += m * head_pad_size * tail_pad_size * 255;
      } else {
	pixAcc0 += m * head_pad_size * tail_pad_size * 0;
      }
      /* Accumulate all of the source pixels for the destination pixel */
      for (int i = 0; i < pix_size; ++i) {
	for (int j = 0; j< m; ++j) {
	  if (xSrc + i*width + j > MIN(yp + 1, origHeight_c)*width) {
	    printf("%d > %d (%d %d %d %d) (%d %d %d)\n", xSrc + i*width + j, MIN(yp + 1, origHeight_c)*width, xSrc, i , width, j, yp, origHeight_c, width);
	    printf("%d %d %d\n", head_pad_size, pix_size, tail_pad_size);
	    assert(0 && "bad access\n");
	  }
	  pixAcc0 += pixBuf[xSrc + i*width + j];
	}
      }
      buffer[y * row_stride + x] = splashFloor(pixAcc0 / (origN*m));
      xSrc += xStep;
      x1 += 1;
    }

  }
  free(pixBuf);

  //XXX: we should handle error's better than this
  image = cairo_image_surface_create_for_data (buffer, CAIRO_FORMAT_A8,
      scaledWidth, scaledHeight, row_stride);
  if (image == NULL) {
1400
    imgStr->close();
1401 1402 1403 1404 1405
    delete imgStr;
    return;
  }
  pattern = cairo_pattern_create_for_surface (image);
  if (pattern == NULL) {
1406
    imgStr->close();
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
    delete imgStr;
    return;
  }

  /* we should actually be using CAIRO_FILTER_NEAREST here. However,
   * cairo doesn't yet do minifaction filtering causing scaled down
   * images with CAIRO_FILTER_NEAREST to look really bad */
  cairo_pattern_set_filter (pattern, CAIRO_FILTER_BEST);

  cairo_save (cairo);

  /* modify our current transformation so that the prescaled image
   * goes where it is supposed to */
  cairo_get_matrix(cairo, &matrix);
  cairo_scale(cairo, 1.0/matrix.xx, 1.0/matrix.yy);
  // get integer co-ords
  cairo_translate (cairo, tx - matrix.x0, ty2 - matrix.y0);
  if (yScale > 0)
    cairo_scale(cairo, 1, -1);

  cairo_mask (cairo, pattern);

  //cairo_get_matrix(cairo, &matrix);
  //printf("mask at: [%f %f], [%f %f], %f %f\n\n", matrix.xx, matrix.xy, matrix.yx, matrix.yy, matrix.x0, matrix.y0);
  cairo_restore(cairo);

1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
  if (cairo_shape) {
    cairo_save (cairo_shape);

    /* modify our current transformation so that the prescaled image
     * goes where it is supposed to */
    cairo_get_matrix(cairo_shape, &matrix);
    cairo_scale(cairo_shape, 1.0/matrix.xx, 1.0/matrix.yy);
    // get integer co-ords
    cairo_translate (cairo_shape, tx - matrix.x0, ty2 - matrix.y0);
    if (yScale > 0)
      cairo_scale(cairo_shape, 1, -1);

    cairo_mask (cairo_shape, pattern);

    cairo_restore(cairo_shape);
  }


1451 1452 1453
  cairo_pattern_destroy (pattern);
  cairo_surface_destroy (image);
  free (buffer);
1454
  imgStr->close();
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1455 1456 1457
  delete imgStr;
}

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
void CairoOutputDev::drawMaskedImage(GfxState *state, Object *ref,
				Stream *str, int width, int height,
				GfxImageColorMap *colorMap,
				Stream *maskStr, int maskWidth,
				int maskHeight, GBool maskInvert)
{
  ImageStream *maskImgStr;
  maskImgStr = new ImageStream(maskStr, maskWidth, 1, 1);
  maskImgStr->reset();

  int row_stride = (maskWidth + 3) & ~3;
  unsigned char *maskBuffer;
1470
  maskBuffer = (unsigned char *)gmallocn (row_stride, maskHeight);
1471 1472 1473 1474