1 // Copyright 2014 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6 
7 #include "render_int.h"
8 
9 #include "core/include/fpdfapi/fpdf_pageobj.h"
10 #include "core/include/fpdfapi/fpdf_render.h"
11 #include "core/include/fxge/fx_ge.h"
12 #include "core/src/fpdfapi/fpdf_page/pageint.h"
13 
14 #define SHADING_STEPS 256
DrawAxialShading(CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Dictionary * pDict,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int alpha)15 static void DrawAxialShading(CFX_DIBitmap* pBitmap,
16                              CFX_Matrix* pObject2Bitmap,
17                              CPDF_Dictionary* pDict,
18                              CPDF_Function** pFuncs,
19                              int nFuncs,
20                              CPDF_ColorSpace* pCS,
21                              int alpha) {
22   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
23   CPDF_Array* pCoords = pDict->GetArray("Coords");
24   if (!pCoords) {
25     return;
26   }
27   FX_FLOAT start_x = pCoords->GetNumber(0);
28   FX_FLOAT start_y = pCoords->GetNumber(1);
29   FX_FLOAT end_x = pCoords->GetNumber(2);
30   FX_FLOAT end_y = pCoords->GetNumber(3);
31   FX_FLOAT t_min = 0, t_max = 1.0f;
32   CPDF_Array* pArray = pDict->GetArray("Domain");
33   if (pArray) {
34     t_min = pArray->GetNumber(0);
35     t_max = pArray->GetNumber(1);
36   }
37   FX_BOOL bStartExtend = FALSE, bEndExtend = FALSE;
38   pArray = pDict->GetArray("Extend");
39   if (pArray) {
40     bStartExtend = pArray->GetInteger(0);
41     bEndExtend = pArray->GetInteger(1);
42   }
43   int width = pBitmap->GetWidth();
44   int height = pBitmap->GetHeight();
45   FX_FLOAT x_span = end_x - start_x;
46   FX_FLOAT y_span = end_y - start_y;
47   FX_FLOAT axis_len_square =
48       FXSYS_Mul(x_span, x_span) + FXSYS_Mul(y_span, y_span);
49   CFX_Matrix matrix;
50   matrix.SetReverse(*pObject2Bitmap);
51   int total_results = 0;
52   for (int j = 0; j < nFuncs; j++) {
53     if (pFuncs[j]) {
54       total_results += pFuncs[j]->CountOutputs();
55     }
56   }
57   if (pCS->CountComponents() > total_results) {
58     total_results = pCS->CountComponents();
59   }
60   CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
61   FX_FLOAT* pResults = result_array;
62   FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
63   FX_DWORD rgb_array[SHADING_STEPS];
64   for (int i = 0; i < SHADING_STEPS; i++) {
65     FX_FLOAT input = (t_max - t_min) * i / SHADING_STEPS + t_min;
66     int offset = 0;
67     for (int j = 0; j < nFuncs; j++) {
68       if (pFuncs[j]) {
69         int nresults = 0;
70         if (pFuncs[j]->Call(&input, 1, pResults + offset, nresults)) {
71           offset += nresults;
72         }
73       }
74     }
75     FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
76     pCS->GetRGB(pResults, R, G, B);
77     rgb_array[i] =
78         FXARGB_TODIB(FXARGB_MAKE(alpha, FXSYS_round(R * 255),
79                                  FXSYS_round(G * 255), FXSYS_round(B * 255)));
80   }
81   int pitch = pBitmap->GetPitch();
82   for (int row = 0; row < height; row++) {
83     FX_DWORD* dib_buf = (FX_DWORD*)(pBitmap->GetBuffer() + row * pitch);
84     for (int column = 0; column < width; column++) {
85       FX_FLOAT x = (FX_FLOAT)column, y = (FX_FLOAT)row;
86       matrix.Transform(x, y);
87       FX_FLOAT scale = FXSYS_Div(
88           FXSYS_Mul(x - start_x, x_span) + FXSYS_Mul(y - start_y, y_span),
89           axis_len_square);
90       int index = (int32_t)(scale * (SHADING_STEPS - 1));
91       if (index < 0) {
92         if (!bStartExtend) {
93           continue;
94         }
95         index = 0;
96       } else if (index >= SHADING_STEPS) {
97         if (!bEndExtend) {
98           continue;
99         }
100         index = SHADING_STEPS - 1;
101       }
102       dib_buf[column] = rgb_array[index];
103     }
104   }
105 }
DrawRadialShading(CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Dictionary * pDict,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int alpha)106 static void DrawRadialShading(CFX_DIBitmap* pBitmap,
107                               CFX_Matrix* pObject2Bitmap,
108                               CPDF_Dictionary* pDict,
109                               CPDF_Function** pFuncs,
110                               int nFuncs,
111                               CPDF_ColorSpace* pCS,
112                               int alpha) {
113   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
114   CPDF_Array* pCoords = pDict->GetArray("Coords");
115   if (!pCoords) {
116     return;
117   }
118   FX_FLOAT start_x = pCoords->GetNumber(0);
119   FX_FLOAT start_y = pCoords->GetNumber(1);
120   FX_FLOAT start_r = pCoords->GetNumber(2);
121   FX_FLOAT end_x = pCoords->GetNumber(3);
122   FX_FLOAT end_y = pCoords->GetNumber(4);
123   FX_FLOAT end_r = pCoords->GetNumber(5);
124   CFX_Matrix matrix;
125   matrix.SetReverse(*pObject2Bitmap);
126   FX_FLOAT t_min = 0, t_max = 1.0f;
127   CPDF_Array* pArray = pDict->GetArray("Domain");
128   if (pArray) {
129     t_min = pArray->GetNumber(0);
130     t_max = pArray->GetNumber(1);
131   }
132   FX_BOOL bStartExtend = FALSE, bEndExtend = FALSE;
133   pArray = pDict->GetArray("Extend");
134   if (pArray) {
135     bStartExtend = pArray->GetInteger(0);
136     bEndExtend = pArray->GetInteger(1);
137   }
138   int total_results = 0;
139   for (int j = 0; j < nFuncs; j++) {
140     if (pFuncs[j]) {
141       total_results += pFuncs[j]->CountOutputs();
142     }
143   }
144   if (pCS->CountComponents() > total_results) {
145     total_results = pCS->CountComponents();
146   }
147   CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
148   FX_FLOAT* pResults = result_array;
149   FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
150   FX_DWORD rgb_array[SHADING_STEPS];
151   for (int i = 0; i < SHADING_STEPS; i++) {
152     FX_FLOAT input = (t_max - t_min) * i / SHADING_STEPS + t_min;
153     int offset = 0;
154     for (int j = 0; j < nFuncs; j++) {
155       if (pFuncs[j]) {
156         int nresults;
157         if (pFuncs[j]->Call(&input, 1, pResults + offset, nresults)) {
158           offset += nresults;
159         }
160       }
161     }
162     FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
163     pCS->GetRGB(pResults, R, G, B);
164     rgb_array[i] =
165         FXARGB_TODIB(FXARGB_MAKE(alpha, FXSYS_round(R * 255),
166                                  FXSYS_round(G * 255), FXSYS_round(B * 255)));
167   }
168   FX_FLOAT a = FXSYS_Mul(start_x - end_x, start_x - end_x) +
169                FXSYS_Mul(start_y - end_y, start_y - end_y) -
170                FXSYS_Mul(start_r - end_r, start_r - end_r);
171   int width = pBitmap->GetWidth();
172   int height = pBitmap->GetHeight();
173   int pitch = pBitmap->GetPitch();
174   FX_BOOL bDecreasing = FALSE;
175   if (start_r > end_r) {
176     int length = (int)FXSYS_sqrt((FXSYS_Mul(start_x - end_x, start_x - end_x) +
177                                   FXSYS_Mul(start_y - end_y, start_y - end_y)));
178     if (length < start_r - end_r) {
179       bDecreasing = TRUE;
180     }
181   }
182   for (int row = 0; row < height; row++) {
183     FX_DWORD* dib_buf = (FX_DWORD*)(pBitmap->GetBuffer() + row * pitch);
184     for (int column = 0; column < width; column++) {
185       FX_FLOAT x = (FX_FLOAT)column, y = (FX_FLOAT)row;
186       matrix.Transform(x, y);
187       FX_FLOAT b = -2 * (FXSYS_Mul(x - start_x, end_x - start_x) +
188                          FXSYS_Mul(y - start_y, end_y - start_y) +
189                          FXSYS_Mul(start_r, end_r - start_r));
190       FX_FLOAT c = FXSYS_Mul(x - start_x, x - start_x) +
191                    FXSYS_Mul(y - start_y, y - start_y) -
192                    FXSYS_Mul(start_r, start_r);
193       FX_FLOAT s;
194       if (a == 0) {
195         s = FXSYS_Div(-c, b);
196       } else {
197         FX_FLOAT b2_4ac = FXSYS_Mul(b, b) - 4 * FXSYS_Mul(a, c);
198         if (b2_4ac < 0) {
199           continue;
200         }
201         FX_FLOAT root = FXSYS_sqrt(b2_4ac);
202         FX_FLOAT s1, s2;
203         if (a > 0) {
204           s1 = FXSYS_Div(-b - root, 2 * a);
205           s2 = FXSYS_Div(-b + root, 2 * a);
206         } else {
207           s2 = FXSYS_Div(-b - root, 2 * a);
208           s1 = FXSYS_Div(-b + root, 2 * a);
209         }
210         if (bDecreasing) {
211           if (s1 >= 0 || bStartExtend) {
212             s = s1;
213           } else {
214             s = s2;
215           }
216         } else {
217           if (s2 <= 1.0f || bEndExtend) {
218             s = s2;
219           } else {
220             s = s1;
221           }
222         }
223         if ((start_r + s * (end_r - start_r)) < 0) {
224           continue;
225         }
226       }
227       int index = (int32_t)(s * (SHADING_STEPS - 1));
228       if (index < 0) {
229         if (!bStartExtend) {
230           continue;
231         }
232         index = 0;
233       }
234       if (index >= SHADING_STEPS) {
235         if (!bEndExtend) {
236           continue;
237         }
238         index = SHADING_STEPS - 1;
239       }
240       dib_buf[column] = rgb_array[index];
241     }
242   }
243 }
DrawFuncShading(CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Dictionary * pDict,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int alpha)244 static void DrawFuncShading(CFX_DIBitmap* pBitmap,
245                             CFX_Matrix* pObject2Bitmap,
246                             CPDF_Dictionary* pDict,
247                             CPDF_Function** pFuncs,
248                             int nFuncs,
249                             CPDF_ColorSpace* pCS,
250                             int alpha) {
251   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
252   CPDF_Array* pDomain = pDict->GetArray("Domain");
253   FX_FLOAT xmin = 0, ymin = 0, xmax = 1.0f, ymax = 1.0f;
254   if (pDomain) {
255     xmin = pDomain->GetNumber(0);
256     xmax = pDomain->GetNumber(1);
257     ymin = pDomain->GetNumber(2);
258     ymax = pDomain->GetNumber(3);
259   }
260   CFX_Matrix mtDomain2Target = pDict->GetMatrix("Matrix");
261   CFX_Matrix matrix, reverse_matrix;
262   matrix.SetReverse(*pObject2Bitmap);
263   reverse_matrix.SetReverse(mtDomain2Target);
264   matrix.Concat(reverse_matrix);
265   int width = pBitmap->GetWidth();
266   int height = pBitmap->GetHeight();
267   int pitch = pBitmap->GetPitch();
268   int total_results = 0;
269   for (int j = 0; j < nFuncs; j++) {
270     if (pFuncs[j]) {
271       total_results += pFuncs[j]->CountOutputs();
272     }
273   }
274   if (pCS->CountComponents() > total_results) {
275     total_results = pCS->CountComponents();
276   }
277   CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
278   FX_FLOAT* pResults = result_array;
279   FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
280   for (int row = 0; row < height; row++) {
281     FX_DWORD* dib_buf = (FX_DWORD*)(pBitmap->GetBuffer() + row * pitch);
282     for (int column = 0; column < width; column++) {
283       FX_FLOAT x = (FX_FLOAT)column, y = (FX_FLOAT)row;
284       matrix.Transform(x, y);
285       if (x < xmin || x > xmax || y < ymin || y > ymax) {
286         continue;
287       }
288       FX_FLOAT input[2];
289       int offset = 0;
290       input[0] = x;
291       input[1] = y;
292       for (int j = 0; j < nFuncs; j++) {
293         if (pFuncs[j]) {
294           int nresults;
295           if (pFuncs[j]->Call(input, 2, pResults + offset, nresults)) {
296             offset += nresults;
297           }
298         }
299       }
300       FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
301       pCS->GetRGB(pResults, R, G, B);
302       dib_buf[column] = FXARGB_TODIB(FXARGB_MAKE(
303           alpha, (int32_t)(R * 255), (int32_t)(G * 255), (int32_t)(B * 255)));
304     }
305   }
306 }
_GetScanlineIntersect(int y,FX_FLOAT x1,FX_FLOAT y1,FX_FLOAT x2,FX_FLOAT y2,FX_FLOAT & x)307 FX_BOOL _GetScanlineIntersect(int y,
308                               FX_FLOAT x1,
309                               FX_FLOAT y1,
310                               FX_FLOAT x2,
311                               FX_FLOAT y2,
312                               FX_FLOAT& x) {
313   if (y1 == y2) {
314     return FALSE;
315   }
316   if (y1 < y2) {
317     if (y < y1 || y > y2) {
318       return FALSE;
319     }
320   } else {
321     if (y < y2 || y > y1) {
322       return FALSE;
323     }
324   }
325   x = x1 + FXSYS_MulDiv(x2 - x1, y - y1, y2 - y1);
326   return TRUE;
327 }
DrawGouraud(CFX_DIBitmap * pBitmap,int alpha,CPDF_MeshVertex triangle[3])328 static void DrawGouraud(CFX_DIBitmap* pBitmap,
329                         int alpha,
330                         CPDF_MeshVertex triangle[3]) {
331   FX_FLOAT min_y = triangle[0].y, max_y = triangle[0].y;
332   for (int i = 1; i < 3; i++) {
333     if (min_y > triangle[i].y) {
334       min_y = triangle[i].y;
335     }
336     if (max_y < triangle[i].y) {
337       max_y = triangle[i].y;
338     }
339   }
340   if (min_y == max_y) {
341     return;
342   }
343   int min_yi = (int)FXSYS_floor(min_y), max_yi = (int)FXSYS_ceil(max_y);
344   if (min_yi < 0) {
345     min_yi = 0;
346   }
347   if (max_yi >= pBitmap->GetHeight()) {
348     max_yi = pBitmap->GetHeight() - 1;
349   }
350   for (int y = min_yi; y <= max_yi; y++) {
351     int nIntersects = 0;
352     FX_FLOAT inter_x[3], r[3], g[3], b[3];
353     for (int i = 0; i < 3; i++) {
354       CPDF_MeshVertex& vertex1 = triangle[i];
355       CPDF_MeshVertex& vertex2 = triangle[(i + 1) % 3];
356       FX_BOOL bIntersect = _GetScanlineIntersect(
357           y, vertex1.x, vertex1.y, vertex2.x, vertex2.y, inter_x[nIntersects]);
358       if (!bIntersect) {
359         continue;
360       }
361       r[nIntersects] =
362           vertex1.r + FXSYS_MulDiv(vertex2.r - vertex1.r, y - vertex1.y,
363                                    vertex2.y - vertex1.y);
364       g[nIntersects] =
365           vertex1.g + FXSYS_MulDiv(vertex2.g - vertex1.g, y - vertex1.y,
366                                    vertex2.y - vertex1.y);
367       b[nIntersects] =
368           vertex1.b + FXSYS_MulDiv(vertex2.b - vertex1.b, y - vertex1.y,
369                                    vertex2.y - vertex1.y);
370       nIntersects++;
371     }
372     if (nIntersects != 2) {
373       continue;
374     }
375     int min_x, max_x, start_index, end_index;
376     if (inter_x[0] < inter_x[1]) {
377       min_x = (int)FXSYS_floor(inter_x[0]);
378       max_x = (int)FXSYS_ceil(inter_x[1]);
379       start_index = 0;
380       end_index = 1;
381     } else {
382       min_x = (int)FXSYS_floor(inter_x[1]);
383       max_x = (int)FXSYS_ceil(inter_x[0]);
384       start_index = 1;
385       end_index = 0;
386     }
387     int start_x = min_x, end_x = max_x;
388     if (start_x < 0) {
389       start_x = 0;
390     }
391     if (end_x > pBitmap->GetWidth()) {
392       end_x = pBitmap->GetWidth();
393     }
394     uint8_t* dib_buf =
395         pBitmap->GetBuffer() + y * pBitmap->GetPitch() + start_x * 4;
396     FX_FLOAT r_unit = (r[end_index] - r[start_index]) / (max_x - min_x);
397     FX_FLOAT g_unit = (g[end_index] - g[start_index]) / (max_x - min_x);
398     FX_FLOAT b_unit = (b[end_index] - b[start_index]) / (max_x - min_x);
399     FX_FLOAT R = r[start_index] + (start_x - min_x) * r_unit;
400     FX_FLOAT G = g[start_index] + (start_x - min_x) * g_unit;
401     FX_FLOAT B = b[start_index] + (start_x - min_x) * b_unit;
402     for (int x = start_x; x < end_x; x++) {
403       R += r_unit;
404       G += g_unit;
405       B += b_unit;
406       FXARGB_SETDIB(dib_buf,
407                     FXARGB_MAKE(alpha, (int32_t)(R * 255), (int32_t)(G * 255),
408                                 (int32_t)(B * 255)));
409       dib_buf += 4;
410     }
411   }
412 }
DrawFreeGouraudShading(CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Stream * pShadingStream,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int alpha)413 static void DrawFreeGouraudShading(CFX_DIBitmap* pBitmap,
414                                    CFX_Matrix* pObject2Bitmap,
415                                    CPDF_Stream* pShadingStream,
416                                    CPDF_Function** pFuncs,
417                                    int nFuncs,
418                                    CPDF_ColorSpace* pCS,
419                                    int alpha) {
420   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
421 
422   CPDF_MeshStream stream;
423   if (!stream.Load(pShadingStream, pFuncs, nFuncs, pCS))
424     return;
425 
426   CPDF_MeshVertex triangle[3];
427   FXSYS_memset(triangle, 0, sizeof(triangle));
428 
429   while (!stream.m_BitStream.IsEOF()) {
430     CPDF_MeshVertex vertex;
431     FX_DWORD flag = stream.GetVertex(vertex, pObject2Bitmap);
432     if (flag == 0) {
433       triangle[0] = vertex;
434       for (int j = 1; j < 3; j++) {
435         stream.GetVertex(triangle[j], pObject2Bitmap);
436       }
437     } else {
438       if (flag == 1) {
439         triangle[0] = triangle[1];
440       }
441       triangle[1] = triangle[2];
442       triangle[2] = vertex;
443     }
444     DrawGouraud(pBitmap, alpha, triangle);
445   }
446 }
DrawLatticeGouraudShading(CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Stream * pShadingStream,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int alpha)447 static void DrawLatticeGouraudShading(CFX_DIBitmap* pBitmap,
448                                       CFX_Matrix* pObject2Bitmap,
449                                       CPDF_Stream* pShadingStream,
450                                       CPDF_Function** pFuncs,
451                                       int nFuncs,
452                                       CPDF_ColorSpace* pCS,
453                                       int alpha) {
454   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
455 
456   int row_verts = pShadingStream->GetDict()->GetInteger("VerticesPerRow");
457   if (row_verts < 2)
458     return;
459 
460   CPDF_MeshStream stream;
461   if (!stream.Load(pShadingStream, pFuncs, nFuncs, pCS))
462     return;
463 
464   CPDF_MeshVertex* vertex = FX_Alloc2D(CPDF_MeshVertex, row_verts, 2);
465   if (!stream.GetVertexRow(vertex, row_verts, pObject2Bitmap)) {
466     FX_Free(vertex);
467     return;
468   }
469   int last_index = 0;
470   while (1) {
471     CPDF_MeshVertex* last_row = vertex + last_index * row_verts;
472     CPDF_MeshVertex* this_row = vertex + (1 - last_index) * row_verts;
473     if (!stream.GetVertexRow(this_row, row_verts, pObject2Bitmap)) {
474       FX_Free(vertex);
475       return;
476     }
477     CPDF_MeshVertex triangle[3];
478     for (int i = 1; i < row_verts; i++) {
479       triangle[0] = last_row[i];
480       triangle[1] = this_row[i - 1];
481       triangle[2] = last_row[i - 1];
482       DrawGouraud(pBitmap, alpha, triangle);
483       triangle[2] = this_row[i];
484       DrawGouraud(pBitmap, alpha, triangle);
485     }
486     last_index = 1 - last_index;
487   }
488   FX_Free(vertex);
489 }
490 struct Coon_BezierCoeff {
491   float a, b, c, d;
FromPointsCoon_BezierCoeff492   void FromPoints(float p0, float p1, float p2, float p3) {
493     a = -p0 + 3 * p1 - 3 * p2 + p3;
494     b = 3 * p0 - 6 * p1 + 3 * p2;
495     c = -3 * p0 + 3 * p1;
496     d = p0;
497   }
first_halfCoon_BezierCoeff498   Coon_BezierCoeff first_half() {
499     Coon_BezierCoeff result;
500     result.a = a / 8;
501     result.b = b / 4;
502     result.c = c / 2;
503     result.d = d;
504     return result;
505   }
second_halfCoon_BezierCoeff506   Coon_BezierCoeff second_half() {
507     Coon_BezierCoeff result;
508     result.a = a / 8;
509     result.b = 3 * a / 8 + b / 4;
510     result.c = 3 * a / 8 + b / 2 + c / 2;
511     result.d = a / 8 + b / 4 + c / 2 + d;
512     return result;
513   }
GetPointsCoon_BezierCoeff514   void GetPoints(float p[4]) {
515     p[0] = d;
516     p[1] = c / 3 + p[0];
517     p[2] = b / 3 - p[0] + 2 * p[1];
518     p[3] = a + p[0] - 3 * p[1] + 3 * p[2];
519   }
GetPointsReverseCoon_BezierCoeff520   void GetPointsReverse(float p[4]) {
521     p[3] = d;
522     p[2] = c / 3 + p[3];
523     p[1] = b / 3 - p[3] + 2 * p[2];
524     p[0] = a + p[3] - 3 * p[2] + 3 * p[1];
525   }
BezierInterpolCoon_BezierCoeff526   void BezierInterpol(Coon_BezierCoeff& C1,
527                       Coon_BezierCoeff& C2,
528                       Coon_BezierCoeff& D1,
529                       Coon_BezierCoeff& D2) {
530     a = (D1.a + D2.a) / 2;
531     b = (D1.b + D2.b) / 2;
532     c = (D1.c + D2.c) / 2 - (C1.a / 8 + C1.b / 4 + C1.c / 2) +
533         (C2.a / 8 + C2.b / 4) + (-C1.d + D2.d) / 2 - (C2.a + C2.b) / 2;
534     d = C1.a / 8 + C1.b / 4 + C1.c / 2 + C1.d;
535   }
DistanceCoon_BezierCoeff536   float Distance() {
537     float dis = a + b + c;
538     return dis < 0 ? -dis : dis;
539   }
540 };
541 struct Coon_Bezier {
542   Coon_BezierCoeff x, y;
FromPointsCoon_Bezier543   void FromPoints(float x0,
544                   float y0,
545                   float x1,
546                   float y1,
547                   float x2,
548                   float y2,
549                   float x3,
550                   float y3) {
551     x.FromPoints(x0, x1, x2, x3);
552     y.FromPoints(y0, y1, y2, y3);
553   }
first_halfCoon_Bezier554   Coon_Bezier first_half() {
555     Coon_Bezier result;
556     result.x = x.first_half();
557     result.y = y.first_half();
558     return result;
559   }
second_halfCoon_Bezier560   Coon_Bezier second_half() {
561     Coon_Bezier result;
562     result.x = x.second_half();
563     result.y = y.second_half();
564     return result;
565   }
BezierInterpolCoon_Bezier566   void BezierInterpol(Coon_Bezier& C1,
567                       Coon_Bezier& C2,
568                       Coon_Bezier& D1,
569                       Coon_Bezier& D2) {
570     x.BezierInterpol(C1.x, C2.x, D1.x, D2.x);
571     y.BezierInterpol(C1.y, C2.y, D1.y, D2.y);
572   }
GetPointsCoon_Bezier573   void GetPoints(FX_PATHPOINT* pPoints) {
574     float p[4];
575     int i;
576     x.GetPoints(p);
577     for (i = 0; i < 4; i++) {
578       pPoints[i].m_PointX = p[i];
579     }
580     y.GetPoints(p);
581     for (i = 0; i < 4; i++) {
582       pPoints[i].m_PointY = p[i];
583     }
584   }
GetPointsReverseCoon_Bezier585   void GetPointsReverse(FX_PATHPOINT* pPoints) {
586     float p[4];
587     int i;
588     x.GetPointsReverse(p);
589     for (i = 0; i < 4; i++) {
590       pPoints[i].m_PointX = p[i];
591     }
592     y.GetPointsReverse(p);
593     for (i = 0; i < 4; i++) {
594       pPoints[i].m_PointY = p[i];
595     }
596   }
DistanceCoon_Bezier597   float Distance() { return x.Distance() + y.Distance(); }
598 };
_BiInterpol(int c0,int c1,int c2,int c3,int x,int y,int x_scale,int y_scale)599 static int _BiInterpol(int c0,
600                        int c1,
601                        int c2,
602                        int c3,
603                        int x,
604                        int y,
605                        int x_scale,
606                        int y_scale) {
607   int x1 = c0 + (c3 - c0) * x / x_scale;
608   int x2 = c1 + (c2 - c1) * x / x_scale;
609   return x1 + (x2 - x1) * y / y_scale;
610 }
611 struct Coon_Color {
Coon_ColorCoon_Color612   Coon_Color() { FXSYS_memset(comp, 0, sizeof(int) * 3); }
613   int comp[3];
BiInterpolCoon_Color614   void BiInterpol(Coon_Color colors[4],
615                   int x,
616                   int y,
617                   int x_scale,
618                   int y_scale) {
619     for (int i = 0; i < 3; i++)
620       comp[i] =
621           _BiInterpol(colors[0].comp[i], colors[1].comp[i], colors[2].comp[i],
622                       colors[3].comp[i], x, y, x_scale, y_scale);
623   }
DistanceCoon_Color624   int Distance(Coon_Color& o) {
625     int max, diff;
626     max = FXSYS_abs(comp[0] - o.comp[0]);
627     diff = FXSYS_abs(comp[1] - o.comp[1]);
628     if (max < diff) {
629       max = diff;
630     }
631     diff = FXSYS_abs(comp[2] - o.comp[2]);
632     if (max < diff) {
633       max = diff;
634     }
635     return max;
636   }
637 };
638 struct CPDF_PatchDrawer {
639   Coon_Color patch_colors[4];
640   int max_delta;
641   CFX_PathData path;
642   CFX_RenderDevice* pDevice;
643   int fill_mode;
644   int alpha;
DrawCPDF_PatchDrawer645   void Draw(int x_scale,
646             int y_scale,
647             int left,
648             int bottom,
649             Coon_Bezier C1,
650             Coon_Bezier C2,
651             Coon_Bezier D1,
652             Coon_Bezier D2) {
653     FX_BOOL bSmall = C1.Distance() < 2 && C2.Distance() < 2 &&
654                      D1.Distance() < 2 && D2.Distance() < 2;
655     Coon_Color div_colors[4];
656     int d_bottom, d_left, d_top, d_right;
657     div_colors[0].BiInterpol(patch_colors, left, bottom, x_scale, y_scale);
658     if (!bSmall) {
659       div_colors[1].BiInterpol(patch_colors, left, bottom + 1, x_scale,
660                                y_scale);
661       div_colors[2].BiInterpol(patch_colors, left + 1, bottom + 1, x_scale,
662                                y_scale);
663       div_colors[3].BiInterpol(patch_colors, left + 1, bottom, x_scale,
664                                y_scale);
665       d_bottom = div_colors[3].Distance(div_colors[0]);
666       d_left = div_colors[1].Distance(div_colors[0]);
667       d_top = div_colors[1].Distance(div_colors[2]);
668       d_right = div_colors[2].Distance(div_colors[3]);
669     }
670 #define COONCOLOR_THRESHOLD 4
671     if (bSmall ||
672         (d_bottom < COONCOLOR_THRESHOLD && d_left < COONCOLOR_THRESHOLD &&
673          d_top < COONCOLOR_THRESHOLD && d_right < COONCOLOR_THRESHOLD)) {
674       FX_PATHPOINT* pPoints = path.GetPoints();
675       C1.GetPoints(pPoints);
676       D2.GetPoints(pPoints + 3);
677       C2.GetPointsReverse(pPoints + 6);
678       D1.GetPointsReverse(pPoints + 9);
679       int fillFlags = FXFILL_WINDING | FXFILL_FULLCOVER;
680       if (fill_mode & RENDER_NOPATHSMOOTH) {
681         fillFlags |= FXFILL_NOPATHSMOOTH;
682       }
683       pDevice->DrawPath(
684           &path, NULL, NULL,
685           FXARGB_MAKE(alpha, div_colors[0].comp[0], div_colors[0].comp[1],
686                       div_colors[0].comp[2]),
687           0, fillFlags);
688     } else {
689       if (d_bottom < COONCOLOR_THRESHOLD && d_top < COONCOLOR_THRESHOLD) {
690         Coon_Bezier m1;
691         m1.BezierInterpol(D1, D2, C1, C2);
692         y_scale *= 2;
693         bottom *= 2;
694         Draw(x_scale, y_scale, left, bottom, C1, m1, D1.first_half(),
695              D2.first_half());
696         Draw(x_scale, y_scale, left, bottom + 1, m1, C2, D1.second_half(),
697              D2.second_half());
698       } else if (d_left < COONCOLOR_THRESHOLD &&
699                  d_right < COONCOLOR_THRESHOLD) {
700         Coon_Bezier m2;
701         m2.BezierInterpol(C1, C2, D1, D2);
702         x_scale *= 2;
703         left *= 2;
704         Draw(x_scale, y_scale, left, bottom, C1.first_half(), C2.first_half(),
705              D1, m2);
706         Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(),
707              C2.second_half(), m2, D2);
708       } else {
709         Coon_Bezier m1, m2;
710         m1.BezierInterpol(D1, D2, C1, C2);
711         m2.BezierInterpol(C1, C2, D1, D2);
712         Coon_Bezier m1f = m1.first_half();
713         Coon_Bezier m1s = m1.second_half();
714         Coon_Bezier m2f = m2.first_half();
715         Coon_Bezier m2s = m2.second_half();
716         x_scale *= 2;
717         y_scale *= 2;
718         left *= 2;
719         bottom *= 2;
720         Draw(x_scale, y_scale, left, bottom, C1.first_half(), m1f,
721              D1.first_half(), m2f);
722         Draw(x_scale, y_scale, left, bottom + 1, m1f, C2.first_half(),
723              D1.second_half(), m2s);
724         Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(), m1s, m2f,
725              D2.first_half());
726         Draw(x_scale, y_scale, left + 1, bottom + 1, m1s, C2.second_half(), m2s,
727              D2.second_half());
728       }
729     }
730   }
731 };
732 
_CheckCoonTensorPara(const CPDF_MeshStream & stream)733 FX_BOOL _CheckCoonTensorPara(const CPDF_MeshStream& stream) {
734   FX_BOOL bCoorBits = (stream.m_nCoordBits == 1 || stream.m_nCoordBits == 2 ||
735                        stream.m_nCoordBits == 4 || stream.m_nCoordBits == 8 ||
736                        stream.m_nCoordBits == 12 || stream.m_nCoordBits == 16 ||
737                        stream.m_nCoordBits == 24 || stream.m_nCoordBits == 32);
738 
739   FX_BOOL bCompBits = (stream.m_nCompBits == 1 || stream.m_nCompBits == 2 ||
740                        stream.m_nCompBits == 4 || stream.m_nCompBits == 8 ||
741                        stream.m_nCompBits == 12 || stream.m_nCompBits == 16);
742 
743   FX_BOOL bFlagBits = (stream.m_nFlagBits == 2 || stream.m_nFlagBits == 4 ||
744                        stream.m_nFlagBits == 8);
745 
746   return bCoorBits && bCompBits && bFlagBits;
747 }
748 
DrawCoonPatchMeshes(FX_BOOL bTensor,CFX_DIBitmap * pBitmap,CFX_Matrix * pObject2Bitmap,CPDF_Stream * pShadingStream,CPDF_Function ** pFuncs,int nFuncs,CPDF_ColorSpace * pCS,int fill_mode,int alpha)749 static void DrawCoonPatchMeshes(FX_BOOL bTensor,
750                                 CFX_DIBitmap* pBitmap,
751                                 CFX_Matrix* pObject2Bitmap,
752                                 CPDF_Stream* pShadingStream,
753                                 CPDF_Function** pFuncs,
754                                 int nFuncs,
755                                 CPDF_ColorSpace* pCS,
756                                 int fill_mode,
757                                 int alpha) {
758   ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
759 
760   CFX_FxgeDevice device;
761   device.Attach(pBitmap);
762   CPDF_MeshStream stream;
763   if (!stream.Load(pShadingStream, pFuncs, nFuncs, pCS))
764     return;
765   if (!_CheckCoonTensorPara(stream))
766     return;
767 
768   CPDF_PatchDrawer patch;
769   patch.alpha = alpha;
770   patch.pDevice = &device;
771   patch.fill_mode = fill_mode;
772   patch.path.SetPointCount(13);
773   FX_PATHPOINT* pPoints = patch.path.GetPoints();
774   pPoints[0].m_Flag = FXPT_MOVETO;
775   for (int i = 1; i < 13; i++) {
776     pPoints[i].m_Flag = FXPT_BEZIERTO;
777   }
778   CFX_FloatPoint coords[16];
779   for (int i = 0; i < 16; i++) {
780     coords[i].Set(0.0f, 0.0f);
781   }
782 
783   int point_count = bTensor ? 16 : 12;
784   while (!stream.m_BitStream.IsEOF()) {
785     FX_DWORD flag = stream.GetFlag();
786     int iStartPoint = 0, iStartColor = 0, i = 0;
787     if (flag) {
788       iStartPoint = 4;
789       iStartColor = 2;
790       CFX_FloatPoint tempCoords[4];
791       for (i = 0; i < 4; i++) {
792         tempCoords[i] = coords[(flag * 3 + i) % 12];
793       }
794       FXSYS_memcpy(coords, tempCoords, sizeof(CFX_FloatPoint) * 4);
795       Coon_Color tempColors[2];
796       tempColors[0] = patch.patch_colors[flag];
797       tempColors[1] = patch.patch_colors[(flag + 1) % 4];
798       FXSYS_memcpy(patch.patch_colors, tempColors, sizeof(Coon_Color) * 2);
799     }
800     for (i = iStartPoint; i < point_count; i++) {
801       stream.GetCoords(coords[i].x, coords[i].y);
802       pObject2Bitmap->Transform(coords[i].x, coords[i].y);
803     }
804     for (i = iStartColor; i < 4; i++) {
805       FX_FLOAT r = 0.0f, g = 0.0f, b = 0.0f;
806       stream.GetColor(r, g, b);
807       patch.patch_colors[i].comp[0] = (int32_t)(r * 255);
808       patch.patch_colors[i].comp[1] = (int32_t)(g * 255);
809       patch.patch_colors[i].comp[2] = (int32_t)(b * 255);
810     }
811     CFX_FloatRect bbox = CFX_FloatRect::GetBBox(coords, point_count);
812     if (bbox.right <= 0 || bbox.left >= (FX_FLOAT)pBitmap->GetWidth() ||
813         bbox.top <= 0 || bbox.bottom >= (FX_FLOAT)pBitmap->GetHeight()) {
814       continue;
815     }
816     Coon_Bezier C1, C2, D1, D2;
817     C1.FromPoints(coords[0].x, coords[0].y, coords[11].x, coords[11].y,
818                   coords[10].x, coords[10].y, coords[9].x, coords[9].y);
819     C2.FromPoints(coords[3].x, coords[3].y, coords[4].x, coords[4].y,
820                   coords[5].x, coords[5].y, coords[6].x, coords[6].y);
821     D1.FromPoints(coords[0].x, coords[0].y, coords[1].x, coords[1].y,
822                   coords[2].x, coords[2].y, coords[3].x, coords[3].y);
823     D2.FromPoints(coords[9].x, coords[9].y, coords[8].x, coords[8].y,
824                   coords[7].x, coords[7].y, coords[6].x, coords[6].y);
825     patch.Draw(1, 1, 0, 0, C1, C2, D1, D2);
826   }
827 }
DrawShading(CPDF_ShadingPattern * pPattern,CFX_Matrix * pMatrix,FX_RECT & clip_rect,int alpha,FX_BOOL bAlphaMode)828 void CPDF_RenderStatus::DrawShading(CPDF_ShadingPattern* pPattern,
829                                     CFX_Matrix* pMatrix,
830                                     FX_RECT& clip_rect,
831                                     int alpha,
832                                     FX_BOOL bAlphaMode) {
833   CPDF_Function** pFuncs = pPattern->m_pFunctions;
834   int nFuncs = pPattern->m_nFuncs;
835   CPDF_Dictionary* pDict = pPattern->m_pShadingObj->GetDict();
836   CPDF_ColorSpace* pColorSpace = pPattern->m_pCS;
837   if (!pColorSpace) {
838     return;
839   }
840   FX_ARGB background = 0;
841   if (!pPattern->m_bShadingObj &&
842       pPattern->m_pShadingObj->GetDict()->KeyExist("Background")) {
843     CPDF_Array* pBackColor =
844         pPattern->m_pShadingObj->GetDict()->GetArray("Background");
845     if (pBackColor &&
846         pBackColor->GetCount() >= (FX_DWORD)pColorSpace->CountComponents()) {
847       CFX_FixedBufGrow<FX_FLOAT, 16> comps(pColorSpace->CountComponents());
848       for (int i = 0; i < pColorSpace->CountComponents(); i++) {
849         comps[i] = pBackColor->GetNumber(i);
850       }
851       FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
852       pColorSpace->GetRGB(comps, R, G, B);
853       background = ArgbEncode(255, (int32_t)(R * 255), (int32_t)(G * 255),
854                               (int32_t)(B * 255));
855     }
856   }
857   if (pDict->KeyExist("BBox")) {
858     CFX_FloatRect rect = pDict->GetRect("BBox");
859     rect.Transform(pMatrix);
860     clip_rect.Intersect(rect.GetOutterRect());
861   }
862   CPDF_DeviceBuffer buffer;
863   buffer.Initialize(m_pContext, m_pDevice, &clip_rect, m_pCurObj, 150);
864   CFX_Matrix FinalMatrix = *pMatrix;
865   FinalMatrix.Concat(*buffer.GetMatrix());
866   CFX_DIBitmap* pBitmap = buffer.GetBitmap();
867   if (!pBitmap->GetBuffer()) {
868     return;
869   }
870   pBitmap->Clear(background);
871   int fill_mode = m_Options.m_Flags;
872   switch (pPattern->m_ShadingType) {
873     case kInvalidShading:
874     case kMaxShading:
875       return;
876     case kFunctionBasedShading:
877       DrawFuncShading(pBitmap, &FinalMatrix, pDict, pFuncs, nFuncs, pColorSpace,
878                       alpha);
879       break;
880     case kAxialShading:
881       DrawAxialShading(pBitmap, &FinalMatrix, pDict, pFuncs, nFuncs,
882                        pColorSpace, alpha);
883       break;
884     case kRadialShading:
885       DrawRadialShading(pBitmap, &FinalMatrix, pDict, pFuncs, nFuncs,
886                         pColorSpace, alpha);
887       break;
888     case kFreeFormGouraudTriangleMeshShading: {
889       DrawFreeGouraudShading(pBitmap, &FinalMatrix,
890                              ToStream(pPattern->m_pShadingObj), pFuncs, nFuncs,
891                              pColorSpace, alpha);
892     } break;
893     case kLatticeFormGouraudTriangleMeshShading: {
894       DrawLatticeGouraudShading(pBitmap, &FinalMatrix,
895                                 ToStream(pPattern->m_pShadingObj), pFuncs,
896                                 nFuncs, pColorSpace, alpha);
897     } break;
898     case kCoonsPatchMeshShading:
899     case kTensorProductPatchMeshShading: {
900       DrawCoonPatchMeshes(
901           pPattern->m_ShadingType == kTensorProductPatchMeshShading, pBitmap,
902           &FinalMatrix, ToStream(pPattern->m_pShadingObj), pFuncs, nFuncs,
903           pColorSpace, fill_mode, alpha);
904     } break;
905   }
906   if (bAlphaMode) {
907     pBitmap->LoadChannel(FXDIB_Red, pBitmap, FXDIB_Alpha);
908   }
909   if (m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
910     pBitmap->ConvertColorScale(m_Options.m_ForeColor, m_Options.m_BackColor);
911   }
912   buffer.OutputToDevice();
913 }
DrawShadingPattern(CPDF_ShadingPattern * pattern,CPDF_PageObject * pPageObj,const CFX_Matrix * pObj2Device,FX_BOOL bStroke)914 void CPDF_RenderStatus::DrawShadingPattern(CPDF_ShadingPattern* pattern,
915                                            CPDF_PageObject* pPageObj,
916                                            const CFX_Matrix* pObj2Device,
917                                            FX_BOOL bStroke) {
918   if (!pattern->Load()) {
919     return;
920   }
921   m_pDevice->SaveState();
922   if (pPageObj->m_Type == PDFPAGE_PATH) {
923     if (!SelectClipPath((CPDF_PathObject*)pPageObj, pObj2Device, bStroke)) {
924       m_pDevice->RestoreState();
925       return;
926     }
927   } else if (pPageObj->m_Type == PDFPAGE_IMAGE) {
928     FX_RECT rect = pPageObj->GetBBox(pObj2Device);
929     m_pDevice->SetClip_Rect(&rect);
930   } else {
931     return;
932   }
933   FX_RECT rect;
934   if (GetObjectClippedRect(pPageObj, pObj2Device, FALSE, rect)) {
935     m_pDevice->RestoreState();
936     return;
937   }
938   CFX_Matrix matrix = pattern->m_Pattern2Form;
939   matrix.Concat(*pObj2Device);
940   GetScaledMatrix(matrix);
941   int alpha = pPageObj->m_GeneralState.GetAlpha(bStroke);
942   DrawShading(pattern, &matrix, rect, alpha,
943               m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
944   m_pDevice->RestoreState();
945 }
ProcessShading(CPDF_ShadingObject * pShadingObj,const CFX_Matrix * pObj2Device)946 FX_BOOL CPDF_RenderStatus::ProcessShading(CPDF_ShadingObject* pShadingObj,
947                                           const CFX_Matrix* pObj2Device) {
948   FX_RECT rect = pShadingObj->GetBBox(pObj2Device);
949   FX_RECT clip_box = m_pDevice->GetClipBox();
950   rect.Intersect(clip_box);
951   if (rect.IsEmpty()) {
952     return TRUE;
953   }
954   CFX_Matrix matrix = pShadingObj->m_Matrix;
955   matrix.Concat(*pObj2Device);
956   DrawShading(pShadingObj->m_pShading, &matrix, rect,
957               pShadingObj->m_GeneralState.GetAlpha(FALSE),
958               m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
959   return TRUE;
960 }
DrawPatternBitmap(CPDF_Document * pDoc,CPDF_PageRenderCache * pCache,CPDF_TilingPattern * pPattern,const CFX_Matrix * pObject2Device,int width,int height,int flags)961 static CFX_DIBitmap* DrawPatternBitmap(CPDF_Document* pDoc,
962                                        CPDF_PageRenderCache* pCache,
963                                        CPDF_TilingPattern* pPattern,
964                                        const CFX_Matrix* pObject2Device,
965                                        int width,
966                                        int height,
967                                        int flags) {
968   CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
969   if (!pBitmap->Create(width, height,
970                        pPattern->m_bColored ? FXDIB_Argb : FXDIB_8bppMask)) {
971     delete pBitmap;
972     return NULL;
973   }
974   CFX_FxgeDevice bitmap_device;
975   bitmap_device.Attach(pBitmap);
976   pBitmap->Clear(0);
977   CFX_FloatRect cell_bbox = pPattern->m_BBox;
978   pPattern->m_Pattern2Form.TransformRect(cell_bbox);
979   pObject2Device->TransformRect(cell_bbox);
980   CFX_FloatRect bitmap_rect(0.0f, 0.0f, (FX_FLOAT)width, (FX_FLOAT)height);
981   CFX_Matrix mtAdjust;
982   mtAdjust.MatchRect(bitmap_rect, cell_bbox);
983   CFX_Matrix mtPattern2Bitmap = *pObject2Device;
984   mtPattern2Bitmap.Concat(mtAdjust);
985   CPDF_RenderOptions options;
986   if (!pPattern->m_bColored) {
987     options.m_ColorMode = RENDER_COLOR_ALPHA;
988   }
989   flags |= RENDER_FORCE_HALFTONE;
990   options.m_Flags = flags;
991   CPDF_RenderContext context(pDoc, pCache);
992   context.DrawObjectList(&bitmap_device, pPattern->m_pForm, &mtPattern2Bitmap,
993                          &options);
994   return pBitmap;
995 }
DrawTilingPattern(CPDF_TilingPattern * pPattern,CPDF_PageObject * pPageObj,const CFX_Matrix * pObj2Device,FX_BOOL bStroke)996 void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
997                                           CPDF_PageObject* pPageObj,
998                                           const CFX_Matrix* pObj2Device,
999                                           FX_BOOL bStroke) {
1000   if (!pPattern->Load()) {
1001     return;
1002   }
1003   m_pDevice->SaveState();
1004   if (pPageObj->m_Type == PDFPAGE_PATH) {
1005     if (!SelectClipPath((CPDF_PathObject*)pPageObj, pObj2Device, bStroke)) {
1006       m_pDevice->RestoreState();
1007       return;
1008     }
1009   } else if (pPageObj->m_Type == PDFPAGE_IMAGE) {
1010     FX_RECT rect = pPageObj->GetBBox(pObj2Device);
1011     m_pDevice->SetClip_Rect(&rect);
1012   } else {
1013     return;
1014   }
1015   FX_RECT clip_box = m_pDevice->GetClipBox();
1016   if (clip_box.IsEmpty()) {
1017     m_pDevice->RestoreState();
1018     return;
1019   }
1020   CFX_Matrix dCTM = m_pDevice->GetCTM();
1021   FX_FLOAT sa = FXSYS_fabs(dCTM.a);
1022   FX_FLOAT sd = FXSYS_fabs(dCTM.d);
1023   clip_box.right = clip_box.left + (int32_t)FXSYS_ceil(clip_box.Width() * sa);
1024   clip_box.bottom = clip_box.top + (int32_t)FXSYS_ceil(clip_box.Height() * sd);
1025   CFX_Matrix mtPattern2Device = pPattern->m_Pattern2Form;
1026   mtPattern2Device.Concat(*pObj2Device);
1027   GetScaledMatrix(mtPattern2Device);
1028   FX_BOOL bAligned = FALSE;
1029   if (pPattern->m_BBox.left == 0 && pPattern->m_BBox.bottom == 0 &&
1030       pPattern->m_BBox.right == pPattern->m_XStep &&
1031       pPattern->m_BBox.top == pPattern->m_YStep &&
1032       (mtPattern2Device.IsScaled() || mtPattern2Device.Is90Rotated())) {
1033     bAligned = TRUE;
1034   }
1035   CFX_FloatRect cell_bbox = pPattern->m_BBox;
1036   mtPattern2Device.TransformRect(cell_bbox);
1037   int width = (int)FXSYS_ceil(cell_bbox.Width());
1038   int height = (int)FXSYS_ceil(cell_bbox.Height());
1039   if (width == 0) {
1040     width = 1;
1041   }
1042   if (height == 0) {
1043     height = 1;
1044   }
1045   int min_col, max_col, min_row, max_row;
1046   CFX_Matrix mtDevice2Pattern;
1047   mtDevice2Pattern.SetReverse(mtPattern2Device);
1048   CFX_FloatRect clip_box_p(clip_box);
1049   clip_box_p.Transform(&mtDevice2Pattern);
1050   min_col = (int)FXSYS_ceil(
1051       FXSYS_Div(clip_box_p.left - pPattern->m_BBox.right, pPattern->m_XStep));
1052   max_col = (int)FXSYS_floor(
1053       FXSYS_Div(clip_box_p.right - pPattern->m_BBox.left, pPattern->m_XStep));
1054   min_row = (int)FXSYS_ceil(
1055       FXSYS_Div(clip_box_p.bottom - pPattern->m_BBox.top, pPattern->m_YStep));
1056   max_row = (int)FXSYS_floor(
1057       FXSYS_Div(clip_box_p.top - pPattern->m_BBox.bottom, pPattern->m_YStep));
1058   if (width > clip_box.Width() || height > clip_box.Height() ||
1059       width * height > clip_box.Width() * clip_box.Height()) {
1060     CPDF_GraphicStates* pStates = NULL;
1061     if (!pPattern->m_bColored) {
1062       pStates = CloneObjStates(pPageObj, bStroke);
1063     }
1064     CPDF_Dictionary* pFormResource = NULL;
1065     if (pPattern->m_pForm->m_pFormDict) {
1066       pFormResource = pPattern->m_pForm->m_pFormDict->GetDict("Resources");
1067     }
1068     for (int col = min_col; col <= max_col; col++)
1069       for (int row = min_row; row <= max_row; row++) {
1070         FX_FLOAT orig_x, orig_y;
1071         orig_x = col * pPattern->m_XStep;
1072         orig_y = row * pPattern->m_YStep;
1073         mtPattern2Device.Transform(orig_x, orig_y);
1074         CFX_Matrix matrix = *pObj2Device;
1075         matrix.Translate(orig_x - mtPattern2Device.e,
1076                          orig_y - mtPattern2Device.f);
1077         m_pDevice->SaveState();
1078         CPDF_RenderStatus status;
1079         status.Initialize(m_pContext, m_pDevice, NULL, NULL, this, pStates,
1080                           &m_Options, pPattern->m_pForm->m_Transparency,
1081                           m_bDropObjects, pFormResource);
1082         status.RenderObjectList(pPattern->m_pForm, &matrix);
1083         m_pDevice->RestoreState();
1084       }
1085     m_pDevice->RestoreState();
1086     delete pStates;
1087     return;
1088   }
1089   if (bAligned) {
1090     int orig_x = FXSYS_round(mtPattern2Device.e);
1091     int orig_y = FXSYS_round(mtPattern2Device.f);
1092     min_col = (clip_box.left - orig_x) / width;
1093     if (clip_box.left < orig_x) {
1094       min_col--;
1095     }
1096     max_col = (clip_box.right - orig_x) / width;
1097     if (clip_box.right <= orig_x) {
1098       max_col--;
1099     }
1100     min_row = (clip_box.top - orig_y) / height;
1101     if (clip_box.top < orig_y) {
1102       min_row--;
1103     }
1104     max_row = (clip_box.bottom - orig_y) / height;
1105     if (clip_box.bottom <= orig_y) {
1106       max_row--;
1107     }
1108   }
1109   FX_FLOAT left_offset = cell_bbox.left - mtPattern2Device.e;
1110   FX_FLOAT top_offset = cell_bbox.bottom - mtPattern2Device.f;
1111   CFX_DIBitmap* pPatternBitmap = NULL;
1112   if (width * height < 16) {
1113     CFX_DIBitmap* pEnlargedBitmap =
1114         DrawPatternBitmap(m_pContext->m_pDocument, m_pContext->m_pPageCache,
1115                           pPattern, pObj2Device, 8, 8, m_Options.m_Flags);
1116     pPatternBitmap = pEnlargedBitmap->StretchTo(width, height);
1117     delete pEnlargedBitmap;
1118   } else {
1119     pPatternBitmap = DrawPatternBitmap(
1120         m_pContext->m_pDocument, m_pContext->m_pPageCache, pPattern,
1121         pObj2Device, width, height, m_Options.m_Flags);
1122   }
1123   if (!pPatternBitmap) {
1124     m_pDevice->RestoreState();
1125     return;
1126   }
1127   if (m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
1128     pPatternBitmap->ConvertColorScale(m_Options.m_ForeColor,
1129                                       m_Options.m_BackColor);
1130   }
1131   FX_ARGB fill_argb = GetFillArgb(pPageObj);
1132   int clip_width = clip_box.right - clip_box.left;
1133   int clip_height = clip_box.bottom - clip_box.top;
1134   CFX_DIBitmap screen;
1135   if (!screen.Create(clip_width, clip_height, FXDIB_Argb)) {
1136     return;
1137   }
1138   screen.Clear(0);
1139   FX_DWORD* src_buf = (FX_DWORD*)pPatternBitmap->GetBuffer();
1140   for (int col = min_col; col <= max_col; col++) {
1141     for (int row = min_row; row <= max_row; row++) {
1142       int start_x, start_y;
1143       if (bAligned) {
1144         start_x = FXSYS_round(mtPattern2Device.e) + col * width - clip_box.left;
1145         start_y = FXSYS_round(mtPattern2Device.f) + row * height - clip_box.top;
1146       } else {
1147         FX_FLOAT orig_x = col * pPattern->m_XStep;
1148         FX_FLOAT orig_y = row * pPattern->m_YStep;
1149         mtPattern2Device.Transform(orig_x, orig_y);
1150         start_x = FXSYS_round(orig_x + left_offset) - clip_box.left;
1151         start_y = FXSYS_round(orig_y + top_offset) - clip_box.top;
1152       }
1153       if (width == 1 && height == 1) {
1154         if (start_x < 0 || start_x >= clip_box.Width() || start_y < 0 ||
1155             start_y >= clip_box.Height()) {
1156           continue;
1157         }
1158         FX_DWORD* dest_buf =
1159             (FX_DWORD*)(screen.GetBuffer() + screen.GetPitch() * start_y +
1160                         start_x * 4);
1161         if (pPattern->m_bColored) {
1162           *dest_buf = *src_buf;
1163         } else {
1164           *dest_buf = (*(uint8_t*)src_buf << 24) | (fill_argb & 0xffffff);
1165         }
1166       } else {
1167         if (pPattern->m_bColored) {
1168           screen.CompositeBitmap(start_x, start_y, width, height,
1169                                  pPatternBitmap, 0, 0);
1170         } else {
1171           screen.CompositeMask(start_x, start_y, width, height, pPatternBitmap,
1172                                fill_argb, 0, 0);
1173         }
1174       }
1175     }
1176   }
1177   CompositeDIBitmap(&screen, clip_box.left, clip_box.top, 0, 255,
1178                     FXDIB_BLEND_NORMAL, FALSE);
1179   m_pDevice->RestoreState();
1180   delete pPatternBitmap;
1181 }
DrawPathWithPattern(CPDF_PathObject * pPathObj,const CFX_Matrix * pObj2Device,CPDF_Color * pColor,FX_BOOL bStroke)1182 void CPDF_RenderStatus::DrawPathWithPattern(CPDF_PathObject* pPathObj,
1183                                             const CFX_Matrix* pObj2Device,
1184                                             CPDF_Color* pColor,
1185                                             FX_BOOL bStroke) {
1186   CPDF_Pattern* pattern = pColor->GetPattern();
1187   if (!pattern) {
1188     return;
1189   }
1190   if (pattern->m_PatternType == CPDF_Pattern::TILING) {
1191     DrawTilingPattern(static_cast<CPDF_TilingPattern*>(pattern), pPathObj,
1192                       pObj2Device, bStroke);
1193   } else {
1194     DrawShadingPattern(static_cast<CPDF_ShadingPattern*>(pattern), pPathObj,
1195                        pObj2Device, bStroke);
1196   }
1197 }
ProcessPathPattern(CPDF_PathObject * pPathObj,const CFX_Matrix * pObj2Device,int & filltype,FX_BOOL & bStroke)1198 void CPDF_RenderStatus::ProcessPathPattern(CPDF_PathObject* pPathObj,
1199                                            const CFX_Matrix* pObj2Device,
1200                                            int& filltype,
1201                                            FX_BOOL& bStroke) {
1202   if (filltype) {
1203     CPDF_Color& FillColor = *pPathObj->m_ColorState.GetFillColor();
1204     if (FillColor.m_pCS && FillColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
1205       DrawPathWithPattern(pPathObj, pObj2Device, &FillColor, FALSE);
1206       filltype = 0;
1207     }
1208   }
1209   if (bStroke) {
1210     CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
1211     if (StrokeColor.m_pCS && StrokeColor.m_pCS->GetFamily() == PDFCS_PATTERN) {
1212       DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, TRUE);
1213       bStroke = FALSE;
1214     }
1215   }
1216 }
1217