CairoOutputDev.cc 52.7 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 19 20 21 22 23 24 25 26 27 28 29 30
// Copyright (C) 2005-2008 Jeff Muizelaar <jeff@infidigm.net>
// Copyright (C) 2005, 2006 Kristian Høgsberg <krh@redhat.com>
// Copyright (C) 2005 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2005 Nickolay V. Shmyrev <nshmyrev@yandex.ru>
// Copyright (C) 2006-2008 Carlos Garcia Campos <carlosgc@gnome.org>
// 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>
//
// 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
31 32 33 34 35 36 37 38 39

#include <config.h>

#ifdef USE_GCC_PRAGMAS
#pragma implementation
#endif

#include <string.h>
#include <math.h>
40
#include <assert.h>
Kristian Høgsberg's avatar
Kristian Høgsberg committed
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
#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"
#include <fofi/FoFiTrueType.h>
#include <splash/SplashBitmap.h>
#include "CairoOutputDev.h"
#include "CairoFontEngine.h"
//------------------------------------------------------------------------

58
// #define LOG_CAIRO
Kristian Høgsberg's avatar
Kristian Høgsberg committed
59 60 61 62 63 64 65

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

66 67 68 69 70 71
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);
}

72 73 74 75
//------------------------------------------------------------------------
// CairoImage
//------------------------------------------------------------------------

76 77
CairoImage::CairoImage (double x1, double y1, double x2, double y2) {
  this->image = NULL;
78 79 80 81 82 83 84 85 86 87
  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
88

89 90 91 92 93 94
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
95 96 97 98
//------------------------------------------------------------------------
// CairoOutputDev
//------------------------------------------------------------------------

99 100 101 102 103 104 105 106 107
// 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;

108
CairoOutputDev::CairoOutputDev() {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
109
  xref = NULL;
110
  catalog = NULL;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
111

112 113 114 115 116
  if (!ft_lib_initialized) {
    FT_Init_FreeType(&ft_lib);
    ft_lib_initialized = gTrue;
  }

Kristian Høgsberg's avatar
Kristian Høgsberg committed
117
  fontEngine = NULL;
118
  fontEngine_owner = gFalse;
119
  glyphs = NULL;
120 121
  fill_pattern = NULL;
  stroke_pattern = NULL;
122 123
  stroke_opacity = 1.0;
  fill_opacity = 1.0;
124
  textClipPath = NULL;
125
  cairo = NULL;
126
  currentFont = NULL;
127
  prescaleImages = gTrue;
128
  printing = gTrue;
129
  inType3Char = gFalse;
130
  t3_glyph_has_bbox = gFalse;
131 132 133 134

  groupColorSpaceStack = NULL;
  group = NULL;
  mask = NULL;
135 136 137
  shape = NULL;
  cairo_shape = NULL;
  knockoutCount = 0;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
138 139 140
}

CairoOutputDev::~CairoOutputDev() {
141
  if (fontEngine_owner && fontEngine) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
142 143
    delete fontEngine;
  }
144

145 146
  if (cairo)
    cairo_destroy (cairo);
147 148
  cairo_pattern_destroy (stroke_pattern);
  cairo_pattern_destroy (fill_pattern);
149 150
  if (group)
    cairo_pattern_destroy (group);
Chris Wilson's avatar
Chris Wilson committed
151 152
  if (mask)
    cairo_pattern_destroy (mask);
153 154
  if (shape)
    cairo_pattern_destroy (shape);
155
}
Kristian Høgsberg's avatar
Kristian Høgsberg committed
156

157
void CairoOutputDev::setCairo(cairo_t *cairo)
158
{
159 160 161 162 163
  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));
    }
164
    cairo_destroy (this->cairo);
165
    assert(!cairo_shape);
166
  }
167
  if (cairo != NULL) {
168
    this->cairo = cairo_reference (cairo);
169 170 171 172
	/* 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 {
173
    this->cairo = NULL;
174
    this->cairo_shape = NULL;
175
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
176 177
}

178 179
void CairoOutputDev::startDoc(XRef *xrefA, Catalog *catalogA,
			      CairoFontEngine *parentFontEngine) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
180
  xref = xrefA;
181
  catalog = catalogA;
182 183 184 185 186 187 188 189
  if (parentFontEngine) {
    fontEngine = parentFontEngine;
  } else {
    if (fontEngine) {
      delete fontEngine;
    }
    fontEngine = new CairoFontEngine(ft_lib);
    fontEngine_owner = gTrue;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
190 191 192
  }
}

193 194 195 196 197 198 199 200 201
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.);
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
202 203 204 205 206 207
void CairoOutputDev::drawLink(Link *link, Catalog *catalog) {
}

void CairoOutputDev::saveState(GfxState *state) {
  LOG(printf ("save\n"));
  cairo_save (cairo);
208 209
  if (cairo_shape)
      cairo_save (cairo_shape);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
210 211 212 213 214
}

void CairoOutputDev::restoreState(GfxState *state) {
  LOG(printf ("restore\n"));
  cairo_restore (cairo);
215 216
  if (cairo_shape)
      cairo_restore (cairo_shape);
217 218 219 220 221 222 223

  /* These aren't restored by cairo_restore() since we keep them in
   * the output device. */
  updateFillColor(state);
  updateStrokeColor(state);
  updateFillOpacity(state);
  updateStrokeOpacity(state);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
224 225 226 227 228 229 230 231 232 233 234
}

void CairoOutputDev::updateAll(GfxState *state) {
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
  updateFlatness(state);
  updateMiterLimit(state);
  updateFillColor(state);
  updateStrokeColor(state);
235 236
  updateFillOpacity(state);
  updateStrokeOpacity(state);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
237 238 239
  needFontUpdate = gTrue;
}

240 241 242 243 244 245 246 247 248
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];

249
  cairo_transform (cairo, &matrix);
250 251
  if (shape)
      cairo_transform (cairo_shape, &matrix);
252 253 254 255

  OutputDev::setDefaultCTM(ctm);
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
256 257 258
void CairoOutputDev::updateCTM(GfxState *state, double m11, double m12,
				double m21, double m22,
				double m31, double m32) {
259
  cairo_matrix_t matrix, invert_matrix;
260 261 262 263 264 265 266
  matrix.xx = m11;
  matrix.yx = m12;
  matrix.xy = m21;
  matrix.yy = m22;
  matrix.x0 = m31;
  matrix.y0 = m32;

267 268 269 270 271 272 273 274
  /* 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
275 276 277
   * instead of having to invert the matrix. */
  invert_matrix = matrix;
  if (cairo_matrix_invert(&invert_matrix)) {
278 279 280 281
    warning("matrix not invertible\n");
    return;
  }

282
  cairo_transform (cairo, &matrix);
283 284
  if (cairo_shape)
    cairo_transform (cairo_shape, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
285 286 287 288 289 290 291 292 293 294 295 296
  updateLineDash(state);
  updateLineJoin(state);
  updateLineCap(state);
  updateLineWidth(state);
}

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

  state->getLineDash(&dashPattern, &dashLength, &dashStart);
297
  cairo_set_dash (cairo, dashPattern, dashLength, dashStart);
298 299
  if (cairo_shape)
    cairo_set_dash (cairo_shape, dashPattern, dashLength, dashStart);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
300 301 302
}

void CairoOutputDev::updateFlatness(GfxState *state) {
303
  // cairo_set_tolerance (cairo, state->getFlatness());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317
}

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;
  }
318 319
  if (cairo_shape)
    cairo_set_line_join (cairo_shape, cairo_get_line_join(cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
320 321 322 323 324 325 326 327 328 329 330 331 332 333
}

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;
  }
334 335
  if (cairo_shape)
    cairo_set_line_cap (cairo_shape, cairo_get_line_cap(cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
336 337 338 339
}

void CairoOutputDev::updateMiterLimit(GfxState *state) {
  cairo_set_miter_limit (cairo, state->getMiterLimit());
340 341
  if (cairo_shape)
    cairo_set_miter_limit (cairo_shape, state->getMiterLimit());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
342 343
}

344
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
345

Kristian Høgsberg's avatar
Kristian Høgsberg committed
346
void CairoOutputDev::updateLineWidth(GfxState *state) {
347 348
  LOG(printf ("line width: %f\n", state->getLineWidth()));
  if (state->getLineWidth() == 0.0) {
349 350 351 352 353
    /* 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)));
354
  } else {
355
    cairo_set_line_width (cairo, state->getLineWidth());
356
  }
357 358
  if (cairo_shape)
    cairo_set_line_width (cairo_shape, cairo_get_line_width (cairo));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
359 360 361 362
}

void CairoOutputDev::updateFillColor(GfxState *state) {
  state->getFillRGB(&fill_color);
363 364 365 366 367 368 369 370 371

  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
372 373 374 375
}

void CairoOutputDev::updateStrokeColor(GfxState *state) {
  state->getStrokeRGB(&stroke_color);
376 377 378 379 380 381 382 383 384

  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
385 386
}

387 388
void CairoOutputDev::updateFillOpacity(GfxState *state) {
  fill_opacity = state->getFillOpacity();
389 390 391 392 393 394 395

  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);

396 397 398 399 400
  LOG(printf ("fill opacity: %f\n", fill_opacity));
}

void CairoOutputDev::updateStrokeOpacity(GfxState *state) {
  stroke_opacity = state->getStrokeOpacity();
401 402 403 404 405 406 407

  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);
  
408 409 410
  LOG(printf ("stroke opacity: %f\n", stroke_opacity));
}

Kristian Høgsberg's avatar
Kristian Høgsberg committed
411
void CairoOutputDev::updateFont(GfxState *state) {
412 413
  cairo_font_face_t *font_face;
  cairo_matrix_t matrix;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
414 415

  LOG(printf ("updateFont() font=%s\n", state->getFont()->getName()->getCString()));
416

Kristian Høgsberg's avatar
Kristian Høgsberg committed
417 418
  needFontUpdate = gFalse;

419
  currentFont = fontEngine->getFont (state->getFont(), xref, catalog);
420

421 422
  if (!currentFont)
    return;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
423

424
  LOG(printf ("font matrix: %f %f %f %f\n", m11, m12, m21, m22));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
425
  
426 427
  font_face = currentFont->getFontFace();
  cairo_set_font_face (cairo, font_face);
428 429 430
 
  double fontSize = state->getFontSize();
  double *m = state->getTextMat();
431 432 433 434 435 436
  /* 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;
437 438
  matrix.xy = -m[2] * fontSize;
  matrix.yy = -m[3] * fontSize;
439 440
  matrix.x0 = 0;
  matrix.y0 = 0;
441
  cairo_set_font_matrix (cairo, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
442 443
}

444
void CairoOutputDev::doPath(cairo_t *cairo, GfxState *state, GfxPath *path) {
Kristian Høgsberg's avatar
Kristian Høgsberg committed
445 446 447 448 449
  GfxSubpath *subpath;
  int i, j;
  for (i = 0; i < path->getNumSubpaths(); ++i) {
    subpath = path->getSubpath(i);
    if (subpath->getNumPoints() > 0) {
450 451
      cairo_move_to (cairo, subpath->getX(0), subpath->getY(0));
         j = 1;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
452 453
      while (j < subpath->getNumPoints()) {
	if (subpath->getCurve(j)) {
454 455 456 457 458
	  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
459 460
	  j += 3;
	} else {
461
	  cairo_line_to (cairo, subpath->getX(j), subpath->getY(j));
Kristian Høgsberg's avatar
Kristian Høgsberg committed
462 463 464 465 466 467 468 469 470 471 472 473
	  ++j;
	}
      }
      if (subpath->isClosed()) {
	LOG (printf ("close\n"));
	cairo_close_path (cairo);
      }
    }
  }
}

void CairoOutputDev::stroke(GfxState *state) {
474
  doPath (cairo, state, state->getPath());
475
  cairo_set_source (cairo, stroke_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
476 477
  LOG(printf ("stroke\n"));
  cairo_stroke (cairo);
478 479 480 481
  if (cairo_shape) {
    doPath (cairo_shape, state, state->getPath());
    cairo_stroke (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
482 483 484
}

void CairoOutputDev::fill(GfxState *state) {
485
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
486
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);
487
  cairo_set_source (cairo, fill_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
488
  LOG(printf ("fill\n"));
489
  //XXX: how do we get the path
Kristian Høgsberg's avatar
Kristian Høgsberg committed
490
  cairo_fill (cairo);
491 492 493 494 495
  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
496 497 498
}

void CairoOutputDev::eoFill(GfxState *state) {
499
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
500
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_EVEN_ODD);
501
  cairo_set_source (cairo, fill_pattern);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
502 503
  LOG(printf ("fill-eo\n"));
  cairo_fill (cairo);
504 505 506 507 508 509 510

  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
511 512
}

513
void CairoOutputDev::clip(GfxState *state) {
514
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
515 516 517
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_WINDING);
  cairo_clip (cairo);
  LOG (printf ("clip\n"));
518 519 520 521 522
  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
523 524 525
}

void CairoOutputDev::eoClip(GfxState *state) {
526
  doPath (cairo, state, state->getPath());
Kristian Høgsberg's avatar
Kristian Høgsberg committed
527 528 529
  cairo_set_fill_rule (cairo, CAIRO_FILL_RULE_EVEN_ODD);
  cairo_clip (cairo);
  LOG (printf ("clip-eo\n"));
530 531 532 533 534 535
  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
536 537
}

538
void CairoOutputDev::beginString(GfxState *state, GooString *s)
539 540
{
  int len = s->getLength();
541

542 543 544
  if (needFontUpdate)
    updateFont(state);

545 546 547
  if (!currentFont)
    return;

548 549 550 551 552 553 554
  glyphs = (cairo_glyph_t *) gmalloc (len * sizeof (cairo_glyph_t));
  glyphCount = 0;
}

void CairoOutputDev::drawChar(GfxState *state, double x, double y,
			      double dx, double dy,
			      double originX, double originY,
555
			      CharCode code, int nBytes, Unicode *u, int uLen)
556
{
557 558 559
  if (!currentFont)
    return;
  
560
  glyphs[glyphCount].index = currentFont->getGlyph (code, u, uLen);
561 562
  glyphs[glyphCount].x = x - originX;
  glyphs[glyphCount].y = y - originY;
563 564 565 566 567 568 569 570
  glyphCount++;
}

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

  if (!currentFont)
Kristian Høgsberg's avatar
Kristian Høgsberg committed
571
    return;
572 573 574 575 576 577 578

  // 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;

579 580
  // ignore empty strings and invisible text -- this is used by
  // Acrobat Capture
Kristian Høgsberg's avatar
Kristian Høgsberg committed
581
  render = state->getRender();
582
  if (render == 3 || glyphCount == 0) {
583 584
    gfree(glyphs);
    glyphs = NULL;
585
    return;
586
  }
587
  
Kristian Høgsberg's avatar
Kristian Høgsberg committed
588
  if (!(render & 1)) {
589
    LOG (printf ("fill string\n"));
590
    cairo_set_source (cairo, fill_pattern);
591
    cairo_show_glyphs (cairo, glyphs, glyphCount);
592 593
    if (cairo_shape)
      cairo_show_glyphs (cairo_shape, glyphs, glyphCount);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
594
  }
595
  
Kristian Høgsberg's avatar
Kristian Høgsberg committed
596 597
  // stroke
  if ((render & 3) == 1 || (render & 3) == 2) {
598
    LOG (printf ("stroke string\n"));
599
    cairo_set_source (cairo, stroke_pattern);
600
    cairo_glyph_path (cairo, glyphs, glyphCount);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
601
    cairo_stroke (cairo);
602 603 604 605
    if (cairo_shape) {
      cairo_glyph_path (cairo_shape, glyphs, glyphCount);
      cairo_stroke (cairo_shape);
    }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
606 607 608 609
  }

  // clip
  if (render & 4) {
610
    LOG (printf ("clip string\n"));
611 612 613 614 615
    // append the glyph path to textClipPath.

    // set textClipPath as the currentPath
    if (textClipPath) {
      cairo_append_path (cairo, textClipPath);
616 617 618
      if (cairo_shape) {
	cairo_append_path (cairo_shape, textClipPath);
      }
619 620 621 622
      cairo_path_destroy (textClipPath);
    }
    
    // append the glyph path
623
    cairo_glyph_path (cairo, glyphs, glyphCount);
624 625 626 627 628
   
    // move the path back into textClipPath 
    // and clear the current path
    textClipPath = cairo_copy_path (cairo);
    cairo_new_path (cairo);
629 630 631
    if (cairo_shape) {
      cairo_new_path (cairo_shape);
    }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
632
  }
633

634
  gfree (glyphs);
635
  glyphs = NULL;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
636 637
}

638

Kristian Høgsberg's avatar
Kristian Høgsberg committed
639 640 641
GBool CairoOutputDev::beginType3Char(GfxState *state, double x, double y,
				      double dx, double dy,
				      CharCode code, Unicode *u, int uLen) {
642 643 644 645 646 647 648 649 650 651 652 653

  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];
654 655 656 657
  /* 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);
658 659 660 661 662
  if (cairo_shape) {
    cairo_save (cairo_shape);
    cairo_set_matrix(cairo_shape, &orig_matrix);
    cairo_transform(cairo_shape, &matrix);
  }
663 664
  cairo_pattern_destroy(stroke_pattern);
  cairo_pattern_reference(fill_pattern);
665
  stroke_pattern = fill_pattern;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
666 667 668 669
  return gFalse;
}

void CairoOutputDev::endType3Char(GfxState *state) {
670
  cairo_restore (cairo);
671 672 673
  if (cairo_shape) {
    cairo_restore (cairo_shape);
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
674 675 676
}

void CairoOutputDev::type3D0(GfxState *state, double wx, double wy) {
677 678
  t3_glyph_wx = wx;
  t3_glyph_wy = wy;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
679 680 681
}

void CairoOutputDev::type3D1(GfxState *state, double wx, double wy,
682
			     double llx, double lly, double urx, double ury) {
683 684 685 686 687 688 689
  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
690 691 692
}

void CairoOutputDev::endTextObject(GfxState *state) {
693 694 695 696
  if (textClipPath) {
    // clip the accumulated text path
    cairo_append_path (cairo, textClipPath);
    cairo_clip (cairo);
697 698 699 700
    if (cairo_shape) {
      cairo_append_path (cairo_shape, textClipPath);
      cairo_clip (cairo_shape);
    }
701 702 703 704
    cairo_path_destroy (textClipPath);
    textClipPath = NULL;
  }

Kristian Høgsberg's avatar
Kristian Høgsberg committed
705 706
}

707 708 709 710 711 712 713 714 715 716 717 718
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);
}

719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748
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;
}



749 750
void CairoOutputDev::beginTransparencyGroup(GfxState * /*state*/, double * /*bbox*/,
                                      GfxColorSpace * blendingColorSpace,
751
                                      GBool /*isolated*/, GBool knockout,
752 753 754 755
				      GBool forSoftMask) {
  /* push color space */
  ColorSpaceStack* css = new ColorSpaceStack;
  css->cs = blendingColorSpace;
756
  css->knockout = knockout;
757 758
  css->next = groupColorSpaceStack;
  groupColorSpaceStack = css;
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780
  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);
  }
781 782 783 784
  if (0 && forSoftMask)
    cairo_push_group_with_content (cairo, CAIRO_CONTENT_ALPHA);
  else
    cairo_push_group (cairo);
785 786 787 788 789 790 791 792

  /* 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);
  }
793
}
794

795
void CairoOutputDev::endTransparencyGroup(GfxState * /*state*/) {
796

797 798 799
  if (group)
    cairo_pattern_destroy(group);
  group = cairo_pop_group (cairo);
800 801 802 803 804 805

  if (groupColorSpaceStack->next && groupColorSpaceStack->next->knockout) {
    if (shape)
      cairo_pattern_destroy(shape);
    shape = cairo_pop_group (cairo_shape);
  }
806
}
807

808 809 810 811
void CairoOutputDev::paintTransparencyGroup(GfxState * /*state*/, double * /*bbox*/) {
  cairo_set_source (cairo, group);

  if (!mask) {
812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
    //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));
839 840 841 842 843 844 845
  } else {
    cairo_mask(cairo, mask);

    cairo_pattern_destroy(mask);
    mask = NULL;
  }

846
  popTransparencyGroup();
847 848 849 850 851 852 853 854 855
}

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;
856 857
  // an arbitrary integer approximation of .3*r + .59*g + .11*b
  int y = (r*19661+g*38666+b*7209 + 32829)>>16;
858 859 860 861
  return y << 24;
}


862
/* XXX: do we need to deal with shape here? */
863 864
void CairoOutputDev::setSoftMask(GfxState * state, double * bbox, GBool alpha,
                                 Function * transferFunc, GfxColor * backdropColor) {
Chris Wilson's avatar
Chris Wilson committed
865 866
  cairo_pattern_destroy(mask);

867 868 869 870 871 872 873
  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. */

    double x1, y1, x2, y2;
    cairo_clip_extents(cairo, &x1, &y1, &x2, &y2);
874 875
    int width = (int)(ceil(x2) - floor(x1));
    int height = (int)(ceil(y2) - floor(y1));
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903

    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
904 905 906
    /* XXX status = cairo_status(maskCtx); */
    cairo_destroy(maskCtx);

907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
    /* 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
937
    mask = cairo_pattern_reference(group);
938
  }
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956

  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;
957 958
}

959

960 961 962
void CairoOutputDev::clearSoftMask(GfxState * /*state*/) {
  //XXX: should we be doing anything here?
}
Kristian Høgsberg's avatar
Kristian Høgsberg committed
963 964 965 966

void CairoOutputDev::drawImageMask(GfxState *state, Object *ref, Stream *str,
				    int width, int height, GBool invert,
				    GBool inlineImg) {
967

968 969 970 971
  /* FIXME: Doesn't the image mask support any colorspace? */
  cairo_set_source (cairo, fill_pattern);

  /* work around a cairo bug when scaling 1x1 surfaces */
972 973
  if (width == 1 && height == 1) {
    cairo_save (cairo);
974
    cairo_rectangle (cairo, 0., 0., width, height);
975 976
    cairo_fill (cairo);
    cairo_restore (cairo);
977 978 979 980 981 982
    if (cairo_shape) {
      cairo_save (cairo_shape);
      cairo_rectangle (cairo_shape, 0., 0., width, height);
      cairo_fill (cairo_shape);
      cairo_restore (cairo_shape);
    }
983 984 985
    return;
  }

986 987
  /* shape is 1.0 for painted areas, 0.0 for unpainted ones */

988 989
  cairo_matrix_t matrix;
  cairo_get_matrix (cairo, &matrix);
990 991
  //XXX: it is possible that we should only do sub pixel positioning if 
  // we are rendering fonts */
992
  if (!printing && prescaleImages && matrix.xy == 0.0 && matrix.yx == 0.0) {
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
    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;

1013 1014
  row_stride = (width + 3) & ~3;
  buffer = (unsigned char *) malloc (height * row_stride);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1015 1016 1017 1018 1019 1020
  if (buffer == NULL) {
    error(-1, "Unable to allocate memory for image.");
    return;
  }

  /* TODO: Do we want to cache these? */
1021
  imgStr = new ImageStream(str, width, 1, 1);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1022 1023
  imgStr->reset();

1024 1025
  invert_bit = invert ? 1 : 0;

Kristian Høgsberg's avatar
Kristian Høgsberg committed
1026
  for (y = 0; y < height; y++) {
1027
    pix = imgStr->getLine();
1028
    dest = buffer + y * row_stride;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1029
    for (x = 0; x < width; x++) {
1030 1031

      if (pix[x] ^ invert_bit)
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1032
	*dest++ = 0;
1033 1034
      else
	*dest++ = 255;
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1035 1036 1037
    }
  }

1038
  image = cairo_image_surface_create_for_data (buffer, CAIRO_FORMAT_A8,
1039
					       width, height, row_stride);
1040 1041
  if (image == NULL) {
    delete imgStr;
1042
    return;
1043
  }
1044
  pattern = cairo_pattern_create_for_surface (image);
1045 1046
  if (pattern == NULL) {
    delete imgStr;
1047
    return;
1048
  }
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1049

1050 1051 1052
  cairo_matrix_init_translate (&matrix, 0, height);
  cairo_matrix_scale (&matrix, width, -height);

1053
  cairo_pattern_set_matrix (pattern, &matrix);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1054

1055 1056 1057
  /* 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 */
1058
  cairo_pattern_set_filter (pattern, CAIRO_FILTER_BEST);
1059

1060
  cairo_mask (cairo, pattern);
1061

1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
  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
  }


1079
  cairo_pattern_destroy (pattern);
1080 1081
  cairo_surface_destroy (image);
  free (buffer);
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
  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
1105
  /* this whole computation should be factored out */
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
  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);
1134 1135 1136
  if (scaledHeight == 0) {
    scaledHeight = 1;
  }
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
#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) {
1152 1153 1154
    //XXX: i'm not positive fabs() is correct
    float tail_error = fabs(matrix.y0 - ty);
    float head_error = fabs(ty2 - (matrix.y0 + yScale));
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 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 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 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
    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) {
    delete imgStr;
    return;
  }
  pattern = cairo_pattern_create_for_surface (image);
  if (pattern == NULL) {
    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);

1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
  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);
  }


1350 1351 1352
  cairo_pattern_destroy (pattern);
  cairo_surface_destroy (image);
  free (buffer);
Kristian Høgsberg's avatar
Kristian Høgsberg committed
1353 1354 1355
  delete imgStr;
}

1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
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;
  maskBuffer = (unsigned char *)gmalloc (row_stride * maskHeight);
  unsigned char *maskDest;
  cairo_surface_t *maskImage;
  cairo_pattern_t *maskPattern;
  Guchar *pix;
  int x, y;

  int invert_bit;
  
  invert_bit = maskInvert ? 1 : 0;

1379
  for (y = 0; y < maskHeight; y++) {
1380 1381
    pix = maskImgStr->getLine();
    maskDest = maskBuffer + y * row_stride;
1382
    for (x = 0; x < maskWidth; x++) {
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
      if (pix[x] ^ invert_bit)
	*maskDest++ = 0;
      else
	*maskDest++ = 255;
    }
  }

  maskImage = cairo_image_surface_create_for_data (maskBuffer, CAIRO_FORMAT_A8,
						 maskWidth, maskHeight, row_stride);

  delete maskImgStr;
  maskStr->close();

  unsigned char *buffer;
  unsigned int *dest;
  cairo_surface_t *image;
  cairo_pattern_t *pattern;
  ImageStream *imgStr;
  cairo_matrix_t matrix;
  int is_identity_transform;

  buffer = (unsigned char *)gmalloc (width * height * 4);

  /* TODO: Do we want to cache these? */
  imgStr = new ImageStream(str, width,
			   colorMap->getNumPixelComps(),
			   colorMap->getBits());
  imgStr->reset();
  
  /* ICCBased color space doesn't do any color correction
   * so check its underlying color space as well */
  is_identity_transform = colorMap->getColorSpace()->getMode() == csDeviceRGB ||
		  colorMap->getColorSpace()->getMode() == csICCBased && 
		  ((GfxICCBasedColorSpace*)colorMap->getColorSpace())->getAlt()->getMode() == csDeviceRGB;

  for (y = 0; y < height; y++) {
    dest = (unsigned int *) (buffer + y * 4 * width);
    pix = imgStr->getLine();
    colorMap->getRGBLine (pix, dest, width);
  }

  image = cairo_image_surface_create_for_data (buffer, CAIRO_FORMAT_RGB24,
						 width, height, width * 4);

1427 1428
  if (image == NULL) {
    delete imgStr;
1429
    return;
1430
  }
1431 1432
  pattern = cairo_pattern_create_for_surface (image);
  maskPattern = cairo_pattern_create_for_surface (maskImage);
1433 1434
  if (pattern == NULL) {
    delete imgStr;
1435
    return;
1436
  }
1437

1438 1439 1440 1441 1442
  LOG (printf ("drawMaskedImage %dx%d\n", width, height));

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

1443
  /* scale the mask to the size of the image unlike softMask */
1444
  cairo_pattern_set_matrix (pattern, &matrix);
1445
  cairo_pattern_set_matrix (maskPattern, &matrix);
1446 1447 1448 1449 1450

  cairo_pattern_set_filter (pattern, CAIRO_FILTER_BILINEAR);
  cairo_set_source (cairo, pattern);
  cairo_mask (cairo, maskPattern);

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
  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
  }

1467 1468 1469 1470 1471 1472 1473 1474 1475
  cairo_pattern_destroy (maskPattern);
  cairo_surface_destroy (maskImage);
  cairo_pattern_destroy (pattern);
  cairo_surface_destroy (image);
  free (buffer);
  free (maskBuffer);
  delete imgStr;
}

1476 1477

//XXX: is this affect by AIS(alpha is shape)?
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
void CairoOutputDev::drawSoftMaskedImage(GfxState *state, Object *ref, Stream *str,
				int width, int height,
				GfxImageColorMap *colorMap,
				Stream *maskStr,
				int maskWidth, int maskHeight,
				GfxImageColorMap *maskColorMap)
{
  ImageStream *maskImgStr;
  maskImgStr = new ImageStream(maskStr, maskWidth,
				       maskColorMap->getNumPixelComps(),
				       maskColorMap->getBits());
  maskImgStr->reset();

  int row_stride = (maskWidth + 3) & ~3;
  unsigned char *maskBuffer;
  maskBuffer = (unsigned char *)gmalloc (row_stride * maskHeight);
  unsigned char *maskDest;
  cairo_surface_t *maskImage;
  cairo_pattern_t *maskPattern;
  Guchar *pix;
1498
  int y;
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
  for (y = 0; y < maskHeight; y++) {
    maskDest = (unsigned char *) (maskBuffer + y * row_stride);
    pix = maskImgStr->getLine();
    maskColorMap->getGrayLine (pix, maskDest, maskWidth);
  }

  maskImage = cairo_image_surface_create_for_data (maskBuffer, CAIRO_FORMAT_A8,
						 maskWidth, maskHeight, row_stride);

  delete maskImgStr;
  maskStr->close();

  unsigned char *buffer;
  unsigned int *dest;
  cairo_surface_t *image;
  cairo_pattern_t *pattern;
  ImageStream *imgStr;
  cairo_matrix_t matrix;
1517
  cairo_matrix_t maskMatrix;
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
  int is_identity_transform;

  buffer = (unsigned char *)gmalloc (width * height * 4);

  /* TODO: Do we want to cache these? */
  imgStr = new ImageStream(str, width,
			   colorMap->getNumPixelComps(),
			   colorMap->getBits());
  imgStr->reset();
  
  /* ICCBased color space doesn't do any color correction
   * so check its underlying color space as well */
  is_identity_transform = colorMap->getColorSpace()->getMode() == csDeviceRGB ||
		  colorMap->getColorSpace()->getMode() == csICCBased && 
		  ((GfxICCBasedColorSpace*)colorMap->getColorSpace())->getAlt()->getMode() == csDeviceRGB;

  for (y = 0; y < height; y++) {
    dest = (unsigned int *) (buffer + y * 4 * width);
    pix = imgStr->getLine();
    colorMap->getRGBLine (pix, dest, width);
  }

  image = cairo_image_surface_create_for_data (buffer, CAIRO_FORMAT_RGB24,
						 width, height, width * 4);

1543 1544
  if (image == NULL) {
    delete imgStr;
1545
    return;
1546
  }
1547 1548
  pattern = cairo_pattern_create_for_surface (image);
  maskPattern = cairo_pattern_create_for_surface (maskImage);
1549 1550
  if (pattern == NULL) {
    delete imgStr;
1551
    return;
1552
  }
1553