1 // Copyright 2016 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 "core/fxge/cfx_renderdevice.h"
8 
9 #include <algorithm>
10 #include <memory>
11 #include <utility>
12 
13 #include "build/build_config.h"
14 #include "core/fxcrt/fx_safe_types.h"
15 #include "core/fxge/cfx_color.h"
16 #include "core/fxge/cfx_defaultrenderdevice.h"
17 #include "core/fxge/cfx_font.h"
18 #include "core/fxge/cfx_fontmgr.h"
19 #include "core/fxge/cfx_gemodule.h"
20 #include "core/fxge/cfx_glyphbitmap.h"
21 #include "core/fxge/cfx_glyphcache.h"
22 #include "core/fxge/cfx_graphstatedata.h"
23 #include "core/fxge/cfx_pathdata.h"
24 #include "core/fxge/dib/cfx_dibitmap.h"
25 #include "core/fxge/dib/cfx_imagerenderer.h"
26 #include "core/fxge/fx_font.h"
27 #include "core/fxge/renderdevicedriver_iface.h"
28 #include "core/fxge/text_char_pos.h"
29 #include "core/fxge/text_glyph_pos.h"
30 
31 #if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
32 #include "third_party/skia/include/core/SkTypes.h"
33 #endif
34 
35 namespace {
36 
AdjustGlyphSpace(std::vector<TextGlyphPos> * pGlyphAndPos)37 void AdjustGlyphSpace(std::vector<TextGlyphPos>* pGlyphAndPos) {
38   ASSERT(pGlyphAndPos->size() > 1);
39   std::vector<TextGlyphPos>& glyphs = *pGlyphAndPos;
40   bool bVertical = glyphs.back().m_Origin.x == glyphs.front().m_Origin.x;
41   if (!bVertical && (glyphs.back().m_Origin.y != glyphs.front().m_Origin.y))
42     return;
43 
44   for (size_t i = glyphs.size() - 1; i > 1; --i) {
45     const TextGlyphPos& next = glyphs[i];
46     int next_origin = bVertical ? next.m_Origin.y : next.m_Origin.x;
47     float next_origin_f = bVertical ? next.m_fOrigin.y : next.m_fOrigin.x;
48 
49     TextGlyphPos& current = glyphs[i - 1];
50     int& current_origin = bVertical ? current.m_Origin.y : current.m_Origin.x;
51     float current_origin_f =
52         bVertical ? current.m_fOrigin.y : current.m_fOrigin.x;
53 
54     FX_SAFE_INT32 safe_space = next_origin;
55     safe_space -= current_origin;
56     if (!safe_space.IsValid())
57       continue;
58 
59     int space = safe_space.ValueOrDie();
60     float space_f = next_origin_f - current_origin_f;
61     float error = fabs(space_f) - fabs(static_cast<float>(space));
62     if (error <= 0.5f)
63       continue;
64 
65     FX_SAFE_INT32 safe_origin = current_origin;
66     safe_origin += space > 0 ? -1 : 1;
67     if (!safe_origin.IsValid())
68       continue;
69 
70     current_origin = safe_origin.ValueOrDie();
71   }
72 }
73 
74 const uint8_t g_TextGammaAdjust[256] = {
75     0,   2,   3,   4,   6,   7,   8,   10,  11,  12,  13,  15,  16,  17,  18,
76     19,  21,  22,  23,  24,  25,  26,  27,  29,  30,  31,  32,  33,  34,  35,
77     36,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,  48,  49,  51,  52,
78     53,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,  64,  65,  66,  67,
79     68,  69,  71,  72,  73,  74,  75,  76,  77,  78,  79,  80,  81,  82,  83,
80     84,  85,  86,  87,  88,  89,  90,  91,  92,  93,  94,  95,  96,  97,  98,
81     99,  100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
82     114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128,
83     129, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142,
84     143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 156,
85     157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171,
86     172, 173, 174, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185,
87     186, 187, 188, 189, 190, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
88     200, 201, 202, 203, 204, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
89     214, 215, 216, 217, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227,
90     228, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 239, 240,
91     241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 250, 251, 252, 253, 254,
92     255,
93 };
94 
TextGammaAdjust(int value)95 int TextGammaAdjust(int value) {
96   ASSERT(value >= 0);
97   ASSERT(value <= 255);
98   return g_TextGammaAdjust[value];
99 }
100 
CalcAlpha(int src,int alpha)101 int CalcAlpha(int src, int alpha) {
102   return src * alpha / 255;
103 }
104 
Merge(uint8_t src,int channel,int alpha,uint8_t * dest)105 void Merge(uint8_t src, int channel, int alpha, uint8_t* dest) {
106   *dest = FXDIB_ALPHA_MERGE(*dest, channel, CalcAlpha(src, alpha));
107 }
108 
MergeGammaAdjust(uint8_t src,int channel,int alpha,uint8_t * dest)109 void MergeGammaAdjust(uint8_t src, int channel, int alpha, uint8_t* dest) {
110   *dest =
111       FXDIB_ALPHA_MERGE(*dest, channel, CalcAlpha(TextGammaAdjust(src), alpha));
112 }
113 
MergeGammaAdjustBgr(const uint8_t * src,int r,int g,int b,int a,uint8_t * dest)114 void MergeGammaAdjustBgr(const uint8_t* src,
115                          int r,
116                          int g,
117                          int b,
118                          int a,
119                          uint8_t* dest) {
120   MergeGammaAdjust(src[0], b, a, &dest[0]);
121   MergeGammaAdjust(src[1], g, a, &dest[1]);
122   MergeGammaAdjust(src[2], r, a, &dest[2]);
123 }
124 
MergeGammaAdjustRgb(const uint8_t * src,int r,int g,int b,int a,uint8_t * dest)125 void MergeGammaAdjustRgb(const uint8_t* src,
126                          int r,
127                          int g,
128                          int b,
129                          int a,
130                          uint8_t* dest) {
131   MergeGammaAdjust(src[2], b, a, &dest[0]);
132   MergeGammaAdjust(src[1], g, a, &dest[1]);
133   MergeGammaAdjust(src[0], r, a, &dest[2]);
134 }
135 
AverageRgb(const uint8_t * src)136 int AverageRgb(const uint8_t* src) {
137   return (src[0] + src[1] + src[2]) / 3;
138 }
139 
CalculateDestAlpha(uint8_t back_alpha,int src_alpha)140 uint8_t CalculateDestAlpha(uint8_t back_alpha, int src_alpha) {
141   return back_alpha + src_alpha - back_alpha * src_alpha / 255;
142 }
143 
ApplyAlpha(uint8_t * dest,int b,int g,int r,int alpha)144 void ApplyAlpha(uint8_t* dest, int b, int g, int r, int alpha) {
145   dest[0] = FXDIB_ALPHA_MERGE(dest[0], b, alpha);
146   dest[1] = FXDIB_ALPHA_MERGE(dest[1], g, alpha);
147   dest[2] = FXDIB_ALPHA_MERGE(dest[2], r, alpha);
148 }
149 
ApplyDestAlpha(uint8_t back_alpha,int src_alpha,int r,int g,int b,uint8_t * dest)150 void ApplyDestAlpha(uint8_t back_alpha,
151                     int src_alpha,
152                     int r,
153                     int g,
154                     int b,
155                     uint8_t* dest) {
156   uint8_t dest_alpha = CalculateDestAlpha(back_alpha, src_alpha);
157   ApplyAlpha(dest, b, g, r, src_alpha * 255 / dest_alpha);
158   dest[3] = dest_alpha;
159 }
160 
NormalizeArgb(int src_value,int r,int g,int b,int a,uint8_t * dest,int src_alpha)161 void NormalizeArgb(int src_value,
162                    int r,
163                    int g,
164                    int b,
165                    int a,
166                    uint8_t* dest,
167                    int src_alpha) {
168   uint8_t back_alpha = dest[3];
169   if (back_alpha == 0)
170     FXARGB_SETDIB(dest, ArgbEncode(src_alpha, r, g, b));
171   else if (src_alpha != 0)
172     ApplyDestAlpha(back_alpha, src_alpha, r, g, b, dest);
173 }
174 
NormalizeDest(bool has_alpha,int src_value,int r,int g,int b,int a,uint8_t * dest)175 void NormalizeDest(bool has_alpha,
176                    int src_value,
177                    int r,
178                    int g,
179                    int b,
180                    int a,
181                    uint8_t* dest) {
182   if (has_alpha) {
183     NormalizeArgb(src_value, r, g, b, a, dest,
184                   CalcAlpha(TextGammaAdjust(src_value), a));
185     return;
186   }
187   int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
188   if (src_alpha == 0)
189     return;
190 
191   ApplyAlpha(dest, b, g, r, src_alpha);
192 }
193 
NormalizeSrc(bool has_alpha,int src_value,int r,int g,int b,int a,uint8_t * dest)194 void NormalizeSrc(bool has_alpha,
195                   int src_value,
196                   int r,
197                   int g,
198                   int b,
199                   int a,
200                   uint8_t* dest) {
201   if (!has_alpha) {
202     ApplyAlpha(dest, b, g, r, CalcAlpha(TextGammaAdjust(src_value), a));
203     return;
204   }
205   int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
206   if (src_alpha != 0)
207     NormalizeArgb(src_value, r, g, b, a, dest, src_alpha);
208 }
209 
NextPixel(uint8_t ** src_scan,uint8_t ** dst_scan,int bpp)210 void NextPixel(uint8_t** src_scan, uint8_t** dst_scan, int bpp) {
211   *src_scan += 3;
212   *dst_scan += bpp;
213 }
214 
SetAlpha(bool has_alpha,uint8_t * alpha)215 void SetAlpha(bool has_alpha, uint8_t* alpha) {
216   if (has_alpha)
217     alpha[3] = 255;
218 }
219 
DrawNormalTextHelper(const RetainPtr<CFX_DIBitmap> & bitmap,const RetainPtr<CFX_DIBitmap> & pGlyph,int nrows,int left,int top,int start_col,int end_col,bool bNormal,bool bBGRStripe,int x_subpixel,int a,int r,int g,int b)220 void DrawNormalTextHelper(const RetainPtr<CFX_DIBitmap>& bitmap,
221                           const RetainPtr<CFX_DIBitmap>& pGlyph,
222                           int nrows,
223                           int left,
224                           int top,
225                           int start_col,
226                           int end_col,
227                           bool bNormal,
228                           bool bBGRStripe,
229                           int x_subpixel,
230                           int a,
231                           int r,
232                           int g,
233                           int b) {
234   const bool has_alpha = bitmap->GetFormat() == FXDIB_Argb;
235   uint8_t* src_buf = pGlyph->GetBuffer();
236   int src_pitch = pGlyph->GetPitch();
237   uint8_t* dest_buf = bitmap->GetBuffer();
238   int dest_pitch = bitmap->GetPitch();
239   const int Bpp = has_alpha ? 4 : bitmap->GetBPP() / 8;
240   for (int row = 0; row < nrows; ++row) {
241     int dest_row = row + top;
242     if (dest_row < 0 || dest_row >= bitmap->GetHeight())
243       continue;
244 
245     uint8_t* src_scan = src_buf + row * src_pitch + (start_col - left) * 3;
246     uint8_t* dest_scan = dest_buf + dest_row * dest_pitch + start_col * Bpp;
247     if (bBGRStripe) {
248       if (x_subpixel == 0) {
249         for (int col = start_col; col < end_col; ++col) {
250           if (has_alpha) {
251             Merge(src_scan[2], r, a, &dest_scan[2]);
252             Merge(src_scan[1], g, a, &dest_scan[1]);
253             Merge(src_scan[0], b, a, &dest_scan[0]);
254           } else {
255             MergeGammaAdjustBgr(&src_scan[0], r, g, b, a, &dest_scan[0]);
256           }
257           SetAlpha(has_alpha, dest_scan);
258           NextPixel(&src_scan, &dest_scan, Bpp);
259         }
260         continue;
261       }
262       if (x_subpixel == 1) {
263         MergeGammaAdjust(src_scan[1], r, a, &dest_scan[2]);
264         MergeGammaAdjust(src_scan[0], g, a, &dest_scan[1]);
265         if (start_col > left)
266           MergeGammaAdjust(src_scan[-1], b, a, &dest_scan[0]);
267         SetAlpha(has_alpha, dest_scan);
268         NextPixel(&src_scan, &dest_scan, Bpp);
269         for (int col = start_col + 1; col < end_col - 1; ++col) {
270           MergeGammaAdjustBgr(&src_scan[-1], r, g, b, a, &dest_scan[0]);
271           SetAlpha(has_alpha, dest_scan);
272           NextPixel(&src_scan, &dest_scan, Bpp);
273         }
274         continue;
275       }
276       MergeGammaAdjust(src_scan[0], r, a, &dest_scan[2]);
277       if (start_col > left) {
278         MergeGammaAdjust(src_scan[-1], g, a, &dest_scan[1]);
279         MergeGammaAdjust(src_scan[-2], b, a, &dest_scan[0]);
280       }
281       SetAlpha(has_alpha, dest_scan);
282       NextPixel(&src_scan, &dest_scan, Bpp);
283       for (int col = start_col + 1; col < end_col - 1; ++col) {
284         MergeGammaAdjustBgr(&src_scan[-2], r, g, b, a, &dest_scan[0]);
285         SetAlpha(has_alpha, dest_scan);
286         NextPixel(&src_scan, &dest_scan, Bpp);
287       }
288       continue;
289     }
290     if (x_subpixel == 0) {
291       for (int col = start_col; col < end_col; ++col) {
292         if (bNormal) {
293           int src_value = AverageRgb(&src_scan[0]);
294           NormalizeDest(has_alpha, src_value, r, g, b, a, dest_scan);
295         } else {
296           MergeGammaAdjustRgb(&src_scan[0], r, g, b, a, &dest_scan[0]);
297           SetAlpha(has_alpha, dest_scan);
298         }
299         NextPixel(&src_scan, &dest_scan, Bpp);
300       }
301       continue;
302     }
303     if (x_subpixel == 1) {
304       if (bNormal) {
305         int src_value = start_col > left ? AverageRgb(&src_scan[-1])
306                                          : (src_scan[0] + src_scan[1]) / 3;
307         NormalizeSrc(has_alpha, src_value, r, g, b, a, dest_scan);
308       } else {
309         if (start_col > left)
310           MergeGammaAdjust(src_scan[-1], r, a, &dest_scan[2]);
311         MergeGammaAdjust(src_scan[0], g, a, &dest_scan[1]);
312         MergeGammaAdjust(src_scan[1], b, a, &dest_scan[0]);
313         SetAlpha(has_alpha, dest_scan);
314       }
315       NextPixel(&src_scan, &dest_scan, Bpp);
316       for (int col = start_col + 1; col < end_col; ++col) {
317         if (bNormal) {
318           int src_value = AverageRgb(&src_scan[-1]);
319           NormalizeDest(has_alpha, src_value, r, g, b, a, dest_scan);
320         } else {
321           MergeGammaAdjustRgb(&src_scan[-1], r, g, b, a, &dest_scan[0]);
322           SetAlpha(has_alpha, dest_scan);
323         }
324         NextPixel(&src_scan, &dest_scan, Bpp);
325       }
326       continue;
327     }
328     if (bNormal) {
329       int src_value =
330           start_col > left ? AverageRgb(&src_scan[-2]) : src_scan[0] / 3;
331       NormalizeSrc(has_alpha, src_value, r, g, b, a, dest_scan);
332     } else {
333       if (start_col > left) {
334         MergeGammaAdjust(src_scan[-2], r, a, &dest_scan[2]);
335         MergeGammaAdjust(src_scan[-1], g, a, &dest_scan[1]);
336       }
337       MergeGammaAdjust(src_scan[0], b, a, &dest_scan[0]);
338       SetAlpha(has_alpha, dest_scan);
339     }
340     NextPixel(&src_scan, &dest_scan, Bpp);
341     for (int col = start_col + 1; col < end_col; ++col) {
342       if (bNormal) {
343         int src_value = AverageRgb(&src_scan[-2]);
344         NormalizeDest(has_alpha, src_value, r, g, b, a, dest_scan);
345       } else {
346         MergeGammaAdjustRgb(&src_scan[-2], r, g, b, a, &dest_scan[0]);
347         SetAlpha(has_alpha, dest_scan);
348       }
349       NextPixel(&src_scan, &dest_scan, Bpp);
350     }
351   }
352 }
353 
ShouldDrawDeviceText(const CFX_Font * pFont,uint32_t text_flags)354 bool ShouldDrawDeviceText(const CFX_Font* pFont, uint32_t text_flags) {
355 #if defined(OS_MACOSX)
356   if (text_flags & FXFONT_CIDFONT)
357     return false;
358 
359   const ByteString bsPsName = pFont->GetPsName();
360   if (bsPsName.Contains("+ZJHL"))
361     return false;
362 
363   if (bsPsName == "CNAAJI+cmex10")
364     return false;
365 #endif
366   return true;
367 }
368 
369 }  // namespace
370 
371 CFX_RenderDevice::CFX_RenderDevice() = default;
372 
~CFX_RenderDevice()373 CFX_RenderDevice::~CFX_RenderDevice() {
374   RestoreState(false);
375 #if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
376   Flush(true);
377 #endif
378 }
379 
380 // static
GetFlipMatrix(float width,float height,float left,float top)381 CFX_Matrix CFX_RenderDevice::GetFlipMatrix(float width,
382                                            float height,
383                                            float left,
384                                            float top) {
385   return CFX_Matrix(width, 0, 0, -height, left, top + height);
386 }
387 
388 #if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
Flush(bool release)389 void CFX_RenderDevice::Flush(bool release) {
390   if (release)
391     m_pDeviceDriver.reset();
392   else
393     m_pDeviceDriver->Flush();
394 }
395 #endif
396 
SetDeviceDriver(std::unique_ptr<RenderDeviceDriverIface> pDriver)397 void CFX_RenderDevice::SetDeviceDriver(
398     std::unique_ptr<RenderDeviceDriverIface> pDriver) {
399   m_pDeviceDriver = std::move(pDriver);
400   InitDeviceInfo();
401 }
402 
InitDeviceInfo()403 void CFX_RenderDevice::InitDeviceInfo() {
404   m_Width = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_WIDTH);
405   m_Height = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_HEIGHT);
406   m_bpp = m_pDeviceDriver->GetDeviceCaps(FXDC_BITS_PIXEL);
407   m_RenderCaps = m_pDeviceDriver->GetDeviceCaps(FXDC_RENDER_CAPS);
408   m_DeviceType = m_pDeviceDriver->GetDeviceType();
409   if (!m_pDeviceDriver->GetClipBox(&m_ClipBox)) {
410     m_ClipBox.left = 0;
411     m_ClipBox.top = 0;
412     m_ClipBox.right = m_Width;
413     m_ClipBox.bottom = m_Height;
414   }
415 }
416 
SaveState()417 void CFX_RenderDevice::SaveState() {
418   m_pDeviceDriver->SaveState();
419 }
420 
RestoreState(bool bKeepSaved)421 void CFX_RenderDevice::RestoreState(bool bKeepSaved) {
422   if (m_pDeviceDriver) {
423     m_pDeviceDriver->RestoreState(bKeepSaved);
424     UpdateClipBox();
425   }
426 }
427 
GetDeviceCaps(int caps_id) const428 int CFX_RenderDevice::GetDeviceCaps(int caps_id) const {
429   return m_pDeviceDriver->GetDeviceCaps(caps_id);
430 }
431 
GetBitmap() const432 RetainPtr<CFX_DIBitmap> CFX_RenderDevice::GetBitmap() const {
433   return m_pBitmap;
434 }
435 
SetBitmap(const RetainPtr<CFX_DIBitmap> & pBitmap)436 void CFX_RenderDevice::SetBitmap(const RetainPtr<CFX_DIBitmap>& pBitmap) {
437   m_pBitmap = pBitmap;
438 }
439 
CreateCompatibleBitmap(const RetainPtr<CFX_DIBitmap> & pDIB,int width,int height) const440 bool CFX_RenderDevice::CreateCompatibleBitmap(
441     const RetainPtr<CFX_DIBitmap>& pDIB,
442     int width,
443     int height) const {
444   if (m_RenderCaps & FXRC_CMYK_OUTPUT) {
445     return pDIB->Create(
446         width, height,
447         m_RenderCaps & FXRC_ALPHA_OUTPUT ? FXDIB_Cmyka : FXDIB_Cmyk);
448   }
449   if (m_RenderCaps & FXRC_BYTEMASK_OUTPUT)
450     return pDIB->Create(width, height, FXDIB_8bppMask);
451 #if defined(OS_MACOSX) || defined _SKIA_SUPPORT_PATHS_
452   constexpr FXDIB_Format kPlatformFormat = FXDIB_Rgb32;
453 #else
454   constexpr FXDIB_Format kPlatformFormat = FXDIB_Rgb;
455 #endif
456   return pDIB->Create(
457       width, height,
458       m_RenderCaps & FXRC_ALPHA_OUTPUT ? FXDIB_Argb : kPlatformFormat);
459 }
460 
SetBaseClip(const FX_RECT & rect)461 void CFX_RenderDevice::SetBaseClip(const FX_RECT& rect) {
462   m_pDeviceDriver->SetBaseClip(rect);
463 }
464 
SetClip_PathFill(const CFX_PathData * pPathData,const CFX_Matrix * pObject2Device,int fill_mode)465 bool CFX_RenderDevice::SetClip_PathFill(const CFX_PathData* pPathData,
466                                         const CFX_Matrix* pObject2Device,
467                                         int fill_mode) {
468   if (!m_pDeviceDriver->SetClip_PathFill(pPathData, pObject2Device,
469                                          fill_mode)) {
470     return false;
471   }
472   UpdateClipBox();
473   return true;
474 }
475 
SetClip_PathStroke(const CFX_PathData * pPathData,const CFX_Matrix * pObject2Device,const CFX_GraphStateData * pGraphState)476 bool CFX_RenderDevice::SetClip_PathStroke(
477     const CFX_PathData* pPathData,
478     const CFX_Matrix* pObject2Device,
479     const CFX_GraphStateData* pGraphState) {
480   if (!m_pDeviceDriver->SetClip_PathStroke(pPathData, pObject2Device,
481                                            pGraphState)) {
482     return false;
483   }
484   UpdateClipBox();
485   return true;
486 }
487 
SetClip_Rect(const FX_RECT & rect)488 bool CFX_RenderDevice::SetClip_Rect(const FX_RECT& rect) {
489   CFX_PathData path;
490   path.AppendRect(rect.left, rect.bottom, rect.right, rect.top);
491   if (!SetClip_PathFill(&path, nullptr, FXFILL_WINDING))
492     return false;
493 
494   UpdateClipBox();
495   return true;
496 }
497 
UpdateClipBox()498 void CFX_RenderDevice::UpdateClipBox() {
499   if (m_pDeviceDriver->GetClipBox(&m_ClipBox))
500     return;
501   m_ClipBox.left = 0;
502   m_ClipBox.top = 0;
503   m_ClipBox.right = m_Width;
504   m_ClipBox.bottom = m_Height;
505 }
506 
DrawPathWithBlend(const CFX_PathData * pPathData,const CFX_Matrix * pObject2Device,const CFX_GraphStateData * pGraphState,uint32_t fill_color,uint32_t stroke_color,int fill_mode,BlendMode blend_type)507 bool CFX_RenderDevice::DrawPathWithBlend(const CFX_PathData* pPathData,
508                                          const CFX_Matrix* pObject2Device,
509                                          const CFX_GraphStateData* pGraphState,
510                                          uint32_t fill_color,
511                                          uint32_t stroke_color,
512                                          int fill_mode,
513                                          BlendMode blend_type) {
514   uint8_t stroke_alpha = pGraphState ? FXARGB_A(stroke_color) : 0;
515   uint8_t fill_alpha = (fill_mode & 3) ? FXARGB_A(fill_color) : 0;
516   const std::vector<FX_PATHPOINT>& pPoints = pPathData->GetPoints();
517   if (stroke_alpha == 0 && pPoints.size() == 2) {
518     CFX_PointF pos1 = pPoints[0].m_Point;
519     CFX_PointF pos2 = pPoints[1].m_Point;
520     if (pObject2Device) {
521       pos1 = pObject2Device->Transform(pos1);
522       pos2 = pObject2Device->Transform(pos2);
523     }
524     DrawCosmeticLine(pos1, pos2, fill_color, fill_mode, blend_type);
525     return true;
526   }
527 
528   if ((pPoints.size() == 5 || pPoints.size() == 4) && stroke_alpha == 0) {
529     CFX_FloatRect rect_f;
530     if (!(fill_mode & FXFILL_RECT_AA) &&
531         pPathData->IsRect(pObject2Device, &rect_f)) {
532       FX_RECT rect_i = rect_f.GetOuterRect();
533 
534       // Depending on the top/bottom, left/right values of the rect it's
535       // possible to overflow the Width() and Height() calculations. Check that
536       // the rect will have valid dimension before continuing.
537       if (!rect_i.Valid())
538         return false;
539 
540       int width = static_cast<int>(ceil(rect_f.right - rect_f.left));
541       if (width < 1) {
542         width = 1;
543         if (rect_i.left == rect_i.right)
544           ++rect_i.right;
545       }
546       int height = static_cast<int>(ceil(rect_f.top - rect_f.bottom));
547       if (height < 1) {
548         height = 1;
549         if (rect_i.bottom == rect_i.top)
550           ++rect_i.bottom;
551       }
552       if (rect_i.Width() >= width + 1) {
553         if (rect_f.left - static_cast<float>(rect_i.left) >
554             static_cast<float>(rect_i.right) - rect_f.right) {
555           ++rect_i.left;
556         } else {
557           --rect_i.right;
558         }
559       }
560       if (rect_i.Height() >= height + 1) {
561         if (rect_f.top - static_cast<float>(rect_i.top) >
562             static_cast<float>(rect_i.bottom) - rect_f.bottom) {
563           ++rect_i.top;
564         } else {
565           --rect_i.bottom;
566         }
567       }
568       if (FillRectWithBlend(rect_i, fill_color, blend_type))
569         return true;
570     }
571   }
572   if ((fill_mode & 3) && stroke_alpha == 0 && !(fill_mode & FX_FILL_STROKE) &&
573       !(fill_mode & FX_FILL_TEXT_MODE)) {
574     CFX_PathData newPath;
575     bool bThin = false;
576     bool setIdentity = false;
577     if (pPathData->GetZeroAreaPath(pObject2Device,
578                                    !!m_pDeviceDriver->GetDriverType(), &newPath,
579                                    &bThin, &setIdentity)) {
580       CFX_GraphStateData graphState;
581       graphState.m_LineWidth = 0.0f;
582 
583       uint32_t strokecolor = fill_color;
584       if (bThin)
585         strokecolor = (((fill_alpha >> 2) << 24) | (strokecolor & 0x00ffffff));
586 
587       const CFX_Matrix* pMatrix = nullptr;
588       if (pObject2Device && !pObject2Device->IsIdentity() && !setIdentity)
589         pMatrix = pObject2Device;
590 
591       int smooth_path = FX_ZEROAREA_FILL;
592       if (fill_mode & FXFILL_NOPATHSMOOTH)
593         smooth_path |= FXFILL_NOPATHSMOOTH;
594 
595       m_pDeviceDriver->DrawPath(&newPath, pMatrix, &graphState, 0, strokecolor,
596                                 smooth_path, blend_type);
597     }
598   }
599   if ((fill_mode & 3) && fill_alpha && stroke_alpha < 0xff &&
600       (fill_mode & FX_FILL_STROKE)) {
601     if (m_RenderCaps & FXRC_FILLSTROKE_PATH) {
602       return m_pDeviceDriver->DrawPath(pPathData, pObject2Device, pGraphState,
603                                        fill_color, stroke_color, fill_mode,
604                                        blend_type);
605     }
606     return DrawFillStrokePath(pPathData, pObject2Device, pGraphState,
607                               fill_color, stroke_color, fill_mode, blend_type);
608   }
609   return m_pDeviceDriver->DrawPath(pPathData, pObject2Device, pGraphState,
610                                    fill_color, stroke_color, fill_mode,
611                                    blend_type);
612 }
613 
614 // This can be removed once PDFium entirely relies on Skia
DrawFillStrokePath(const CFX_PathData * pPathData,const CFX_Matrix * pObject2Device,const CFX_GraphStateData * pGraphState,uint32_t fill_color,uint32_t stroke_color,int fill_mode,BlendMode blend_type)615 bool CFX_RenderDevice::DrawFillStrokePath(const CFX_PathData* pPathData,
616                                           const CFX_Matrix* pObject2Device,
617                                           const CFX_GraphStateData* pGraphState,
618                                           uint32_t fill_color,
619                                           uint32_t stroke_color,
620                                           int fill_mode,
621                                           BlendMode blend_type) {
622   if (!(m_RenderCaps & FXRC_GET_BITS))
623     return false;
624   CFX_FloatRect bbox;
625   if (pGraphState) {
626     bbox = pPathData->GetBoundingBox(pGraphState->m_LineWidth,
627                                      pGraphState->m_MiterLimit);
628   } else {
629     bbox = pPathData->GetBoundingBox();
630   }
631   if (pObject2Device)
632     bbox = pObject2Device->TransformRect(bbox);
633 
634   FX_RECT rect = bbox.GetOuterRect();
635   if (!rect.Valid())
636     return false;
637 
638   auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
639   auto backdrop = pdfium::MakeRetain<CFX_DIBitmap>();
640   if (!CreateCompatibleBitmap(bitmap, rect.Width(), rect.Height()))
641     return false;
642 
643   if (bitmap->HasAlpha()) {
644     bitmap->Clear(0);
645     backdrop->Copy(bitmap);
646   } else {
647     if (!m_pDeviceDriver->GetDIBits(bitmap, rect.left, rect.top))
648       return false;
649     backdrop->Copy(bitmap);
650   }
651   CFX_DefaultRenderDevice bitmap_device;
652   bitmap_device.Attach(bitmap, false, backdrop, true);
653 
654   CFX_Matrix matrix;
655   if (pObject2Device)
656     matrix = *pObject2Device;
657   matrix.Translate(-rect.left, -rect.top);
658   if (!bitmap_device.GetDeviceDriver()->DrawPath(
659           pPathData, &matrix, pGraphState, fill_color, stroke_color, fill_mode,
660           blend_type)) {
661     return false;
662   }
663 #if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
664   bitmap_device.GetDeviceDriver()->Flush();
665 #endif
666   FX_RECT src_rect(0, 0, rect.Width(), rect.Height());
667   return m_pDeviceDriver->SetDIBits(bitmap, 0, src_rect, rect.left, rect.top,
668                                     BlendMode::kNormal);
669 }
670 
FillRectWithBlend(const FX_RECT & rect,uint32_t fill_color,BlendMode blend_type)671 bool CFX_RenderDevice::FillRectWithBlend(const FX_RECT& rect,
672                                          uint32_t fill_color,
673                                          BlendMode blend_type) {
674   if (m_pDeviceDriver->FillRectWithBlend(rect, fill_color, blend_type))
675     return true;
676 
677   if (!(m_RenderCaps & FXRC_GET_BITS))
678     return false;
679 
680   auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
681   if (!CreateCompatibleBitmap(bitmap, rect.Width(), rect.Height()))
682     return false;
683 
684   if (!m_pDeviceDriver->GetDIBits(bitmap, rect.left, rect.top))
685     return false;
686 
687   if (!bitmap->CompositeRect(0, 0, rect.Width(), rect.Height(), fill_color,
688                              0)) {
689     return false;
690   }
691   FX_RECT src_rect(0, 0, rect.Width(), rect.Height());
692   m_pDeviceDriver->SetDIBits(bitmap, 0, src_rect, rect.left, rect.top,
693                              BlendMode::kNormal);
694   return true;
695 }
696 
DrawCosmeticLine(const CFX_PointF & ptMoveTo,const CFX_PointF & ptLineTo,uint32_t color,int fill_mode,BlendMode blend_type)697 bool CFX_RenderDevice::DrawCosmeticLine(const CFX_PointF& ptMoveTo,
698                                         const CFX_PointF& ptLineTo,
699                                         uint32_t color,
700                                         int fill_mode,
701                                         BlendMode blend_type) {
702   if ((color >= 0xff000000) && m_pDeviceDriver->DrawCosmeticLine(
703                                    ptMoveTo, ptLineTo, color, blend_type)) {
704     return true;
705   }
706   CFX_GraphStateData graph_state;
707   CFX_PathData path;
708   path.AppendPoint(ptMoveTo, FXPT_TYPE::MoveTo, false);
709   path.AppendPoint(ptLineTo, FXPT_TYPE::LineTo, false);
710   return m_pDeviceDriver->DrawPath(&path, nullptr, &graph_state, 0, color,
711                                    fill_mode, blend_type);
712 }
713 
GetDIBits(const RetainPtr<CFX_DIBitmap> & pBitmap,int left,int top)714 bool CFX_RenderDevice::GetDIBits(const RetainPtr<CFX_DIBitmap>& pBitmap,
715                                  int left,
716                                  int top) {
717   return (m_RenderCaps & FXRC_GET_BITS) &&
718          m_pDeviceDriver->GetDIBits(pBitmap, left, top);
719 }
720 
GetBackDrop()721 RetainPtr<CFX_DIBitmap> CFX_RenderDevice::GetBackDrop() {
722   return m_pDeviceDriver->GetBackDrop();
723 }
724 
SetDIBitsWithBlend(const RetainPtr<CFX_DIBBase> & pBitmap,int left,int top,BlendMode blend_mode)725 bool CFX_RenderDevice::SetDIBitsWithBlend(const RetainPtr<CFX_DIBBase>& pBitmap,
726                                           int left,
727                                           int top,
728                                           BlendMode blend_mode) {
729   ASSERT(!pBitmap->IsAlphaMask());
730   FX_RECT dest_rect(left, top, left + pBitmap->GetWidth(),
731                     top + pBitmap->GetHeight());
732   dest_rect.Intersect(m_ClipBox);
733   if (dest_rect.IsEmpty())
734     return true;
735 
736   FX_RECT src_rect(dest_rect.left - left, dest_rect.top - top,
737                    dest_rect.left - left + dest_rect.Width(),
738                    dest_rect.top - top + dest_rect.Height());
739   if ((blend_mode == BlendMode::kNormal || (m_RenderCaps & FXRC_BLEND_MODE)) &&
740       (!pBitmap->HasAlpha() || (m_RenderCaps & FXRC_ALPHA_IMAGE))) {
741     return m_pDeviceDriver->SetDIBits(pBitmap, 0, src_rect, dest_rect.left,
742                                       dest_rect.top, blend_mode);
743   }
744   if (!(m_RenderCaps & FXRC_GET_BITS))
745     return false;
746 
747   int bg_pixel_width = dest_rect.Width();
748   int bg_pixel_height = dest_rect.Height();
749   auto background = pdfium::MakeRetain<CFX_DIBitmap>();
750   if (!background->Create(
751           bg_pixel_width, bg_pixel_height,
752           (m_RenderCaps & FXRC_CMYK_OUTPUT) ? FXDIB_Cmyk : FXDIB_Rgb32)) {
753     return false;
754   }
755   if (!m_pDeviceDriver->GetDIBits(background, dest_rect.left, dest_rect.top)) {
756     return false;
757   }
758   if (!background->CompositeBitmap(0, 0, bg_pixel_width, bg_pixel_height,
759                                    pBitmap, src_rect.left, src_rect.top,
760                                    blend_mode, nullptr, false)) {
761     return false;
762   }
763   FX_RECT rect(0, 0, bg_pixel_width, bg_pixel_height);
764   return m_pDeviceDriver->SetDIBits(background, 0, rect, dest_rect.left,
765                                     dest_rect.top, BlendMode::kNormal);
766 }
767 
StretchDIBitsWithFlagsAndBlend(const RetainPtr<CFX_DIBBase> & pBitmap,int left,int top,int dest_width,int dest_height,const FXDIB_ResampleOptions & options,BlendMode blend_mode)768 bool CFX_RenderDevice::StretchDIBitsWithFlagsAndBlend(
769     const RetainPtr<CFX_DIBBase>& pBitmap,
770     int left,
771     int top,
772     int dest_width,
773     int dest_height,
774     const FXDIB_ResampleOptions& options,
775     BlendMode blend_mode) {
776   FX_RECT dest_rect(left, top, left + dest_width, top + dest_height);
777   FX_RECT clip_box = m_ClipBox;
778   clip_box.Intersect(dest_rect);
779   return clip_box.IsEmpty() || m_pDeviceDriver->StretchDIBits(
780                                    pBitmap, 0, left, top, dest_width,
781                                    dest_height, &clip_box, options, blend_mode);
782 }
783 
SetBitMask(const RetainPtr<CFX_DIBBase> & pBitmap,int left,int top,uint32_t argb)784 bool CFX_RenderDevice::SetBitMask(const RetainPtr<CFX_DIBBase>& pBitmap,
785                                   int left,
786                                   int top,
787                                   uint32_t argb) {
788   FX_RECT src_rect(0, 0, pBitmap->GetWidth(), pBitmap->GetHeight());
789   return m_pDeviceDriver->SetDIBits(pBitmap, argb, src_rect, left, top,
790                                     BlendMode::kNormal);
791 }
792 
StretchBitMask(const RetainPtr<CFX_DIBBase> & pBitmap,int left,int top,int dest_width,int dest_height,uint32_t color)793 bool CFX_RenderDevice::StretchBitMask(const RetainPtr<CFX_DIBBase>& pBitmap,
794                                       int left,
795                                       int top,
796                                       int dest_width,
797                                       int dest_height,
798                                       uint32_t color) {
799   return StretchBitMaskWithFlags(pBitmap, left, top, dest_width, dest_height,
800                                  color, FXDIB_ResampleOptions());
801 }
802 
StretchBitMaskWithFlags(const RetainPtr<CFX_DIBBase> & pBitmap,int left,int top,int dest_width,int dest_height,uint32_t argb,const FXDIB_ResampleOptions & options)803 bool CFX_RenderDevice::StretchBitMaskWithFlags(
804     const RetainPtr<CFX_DIBBase>& pBitmap,
805     int left,
806     int top,
807     int dest_width,
808     int dest_height,
809     uint32_t argb,
810     const FXDIB_ResampleOptions& options) {
811   FX_RECT dest_rect(left, top, left + dest_width, top + dest_height);
812   FX_RECT clip_box = m_ClipBox;
813   clip_box.Intersect(dest_rect);
814   return m_pDeviceDriver->StretchDIBits(pBitmap, argb, left, top, dest_width,
815                                         dest_height, &clip_box, options,
816                                         BlendMode::kNormal);
817 }
818 
StartDIBitsWithBlend(const RetainPtr<CFX_DIBBase> & pBitmap,int bitmap_alpha,uint32_t argb,const CFX_Matrix & matrix,const FXDIB_ResampleOptions & options,std::unique_ptr<CFX_ImageRenderer> * handle,BlendMode blend_mode)819 bool CFX_RenderDevice::StartDIBitsWithBlend(
820     const RetainPtr<CFX_DIBBase>& pBitmap,
821     int bitmap_alpha,
822     uint32_t argb,
823     const CFX_Matrix& matrix,
824     const FXDIB_ResampleOptions& options,
825     std::unique_ptr<CFX_ImageRenderer>* handle,
826     BlendMode blend_mode) {
827   return m_pDeviceDriver->StartDIBits(pBitmap, bitmap_alpha, argb, matrix,
828                                       options, handle, blend_mode);
829 }
830 
ContinueDIBits(CFX_ImageRenderer * handle,PauseIndicatorIface * pPause)831 bool CFX_RenderDevice::ContinueDIBits(CFX_ImageRenderer* handle,
832                                       PauseIndicatorIface* pPause) {
833   return m_pDeviceDriver->ContinueDIBits(handle, pPause);
834 }
835 
836 #ifdef _SKIA_SUPPORT_
DebugVerifyBitmapIsPreMultiplied() const837 void CFX_RenderDevice::DebugVerifyBitmapIsPreMultiplied() const {
838   NOTREACHED();
839 }
840 
SetBitsWithMask(const RetainPtr<CFX_DIBBase> & pBitmap,const RetainPtr<CFX_DIBBase> & pMask,int left,int top,int bitmap_alpha,BlendMode blend_type)841 bool CFX_RenderDevice::SetBitsWithMask(const RetainPtr<CFX_DIBBase>& pBitmap,
842                                        const RetainPtr<CFX_DIBBase>& pMask,
843                                        int left,
844                                        int top,
845                                        int bitmap_alpha,
846                                        BlendMode blend_type) {
847   return m_pDeviceDriver->SetBitsWithMask(pBitmap, pMask, left, top,
848                                           bitmap_alpha, blend_type);
849 }
850 #endif
851 
DrawNormalText(int nChars,const TextCharPos * pCharPos,CFX_Font * pFont,float font_size,const CFX_Matrix & mtText2Device,uint32_t fill_color,uint32_t text_flags)852 bool CFX_RenderDevice::DrawNormalText(int nChars,
853                                       const TextCharPos* pCharPos,
854                                       CFX_Font* pFont,
855                                       float font_size,
856                                       const CFX_Matrix& mtText2Device,
857                                       uint32_t fill_color,
858                                       uint32_t text_flags) {
859   int nativetext_flags = text_flags;
860   if (m_DeviceType != DeviceType::kDisplay) {
861     if (!(text_flags & FXTEXT_PRINTGRAPHICTEXT)) {
862       if (ShouldDrawDeviceText(pFont, text_flags) &&
863           m_pDeviceDriver->DrawDeviceText(
864               nChars, pCharPos, pFont, mtText2Device, font_size, fill_color)) {
865         return true;
866       }
867     }
868     if (FXARGB_A(fill_color) < 255)
869       return false;
870   } else if (!(text_flags & FXTEXT_NO_NATIVETEXT)) {
871     if (ShouldDrawDeviceText(pFont, text_flags) &&
872         m_pDeviceDriver->DrawDeviceText(nChars, pCharPos, pFont, mtText2Device,
873                                         font_size, fill_color)) {
874       return true;
875     }
876   }
877   CFX_Matrix char2device = mtText2Device;
878   CFX_Matrix text2Device = mtText2Device;
879   char2device.Scale(font_size, -font_size);
880   if (fabs(char2device.a) + fabs(char2device.b) > 50 * 1.0f ||
881       (m_DeviceType == DeviceType::kPrinter &&
882        !(text_flags & FXTEXT_PRINTIMAGETEXT))) {
883     if (pFont->GetFaceRec()) {
884       int nPathFlags =
885           (text_flags & FXTEXT_NOSMOOTH) == 0 ? 0 : FXFILL_NOPATHSMOOTH;
886       return DrawTextPath(nChars, pCharPos, pFont, font_size, mtText2Device,
887                           nullptr, nullptr, fill_color, 0, nullptr, nPathFlags);
888     }
889   }
890   int anti_alias = FT_RENDER_MODE_MONO;
891   bool bNormal = false;
892   if ((text_flags & FXTEXT_NOSMOOTH) == 0) {
893     if (m_DeviceType == DeviceType::kDisplay && m_bpp > 1) {
894       if (!CFX_GEModule::Get()->GetFontMgr()->FTLibrarySupportsHinting()) {
895         // Some Freetype implementations (like the one packaged with Fedora) do
896         // not support hinting due to patents 6219025, 6239783, 6307566,
897         // 6225973, 6243070, 6393145, 6421054, 6282327, and 6624828; the latest
898         // one expires 10/7/19.  This makes LCD antialiasing very ugly, so we
899         // instead fall back on NORMAL antialiasing.
900         anti_alias = FT_RENDER_MODE_NORMAL;
901       } else if ((m_RenderCaps & (FXRC_ALPHA_OUTPUT | FXRC_CMYK_OUTPUT))) {
902         anti_alias = FT_RENDER_MODE_LCD;
903         bNormal = true;
904       } else if (m_bpp < 16) {
905         anti_alias = FT_RENDER_MODE_NORMAL;
906       } else {
907         anti_alias = FT_RENDER_MODE_LCD;
908 
909         bool bClearType = false;
910         if (pFont->GetFaceRec())
911           bClearType = !!(text_flags & FXTEXT_CLEARTYPE);
912         bNormal = !bClearType;
913       }
914     }
915   }
916   std::vector<TextGlyphPos> glyphs(nChars);
917   CFX_Matrix deviceCtm = char2device;
918 
919   for (size_t i = 0; i < glyphs.size(); ++i) {
920     TextGlyphPos& glyph = glyphs[i];
921     const TextCharPos& charpos = pCharPos[i];
922 
923     glyph.m_fOrigin = text2Device.Transform(charpos.m_Origin);
924     if (anti_alias < FT_RENDER_MODE_LCD)
925       glyph.m_Origin.x = FXSYS_roundf(glyph.m_fOrigin.x);
926     else
927       glyph.m_Origin.x = static_cast<int>(floor(glyph.m_fOrigin.x));
928     glyph.m_Origin.y = FXSYS_roundf(glyph.m_fOrigin.y);
929 
930     if (charpos.m_bGlyphAdjust) {
931       CFX_Matrix new_matrix(
932           charpos.m_AdjustMatrix[0], charpos.m_AdjustMatrix[1],
933           charpos.m_AdjustMatrix[2], charpos.m_AdjustMatrix[3], 0, 0);
934       new_matrix.Concat(deviceCtm);
935       glyph.m_pGlyph = pFont->LoadGlyphBitmap(
936           charpos.m_GlyphIndex, charpos.m_bFontStyle, new_matrix,
937           charpos.m_FontCharWidth, anti_alias, &nativetext_flags);
938     } else {
939       glyph.m_pGlyph = pFont->LoadGlyphBitmap(
940           charpos.m_GlyphIndex, charpos.m_bFontStyle, deviceCtm,
941           charpos.m_FontCharWidth, anti_alias, &nativetext_flags);
942     }
943   }
944   if (anti_alias < FT_RENDER_MODE_LCD && glyphs.size() > 1)
945     AdjustGlyphSpace(&glyphs);
946 
947   FX_RECT bmp_rect = GetGlyphsBBox(glyphs, anti_alias);
948   bmp_rect.Intersect(m_ClipBox);
949   if (bmp_rect.IsEmpty())
950     return true;
951 
952   int pixel_width = bmp_rect.Width();
953   int pixel_height = bmp_rect.Height();
954   int pixel_left = bmp_rect.left;
955   int pixel_top = bmp_rect.top;
956   if (anti_alias == FT_RENDER_MODE_MONO) {
957     auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
958     if (!bitmap->Create(pixel_width, pixel_height, FXDIB_1bppMask))
959       return false;
960     bitmap->Clear(0);
961     for (const TextGlyphPos& glyph : glyphs) {
962       if (!glyph.m_pGlyph)
963         continue;
964 
965       Optional<CFX_Point> point = glyph.GetOrigin({pixel_left, pixel_top});
966       if (!point.has_value())
967         continue;
968 
969       const RetainPtr<CFX_DIBitmap>& pGlyph = glyph.m_pGlyph->GetBitmap();
970       bitmap->TransferBitmap(point.value().x, point.value().y,
971                              pGlyph->GetWidth(), pGlyph->GetHeight(), pGlyph, 0,
972                              0);
973     }
974     return SetBitMask(bitmap, bmp_rect.left, bmp_rect.top, fill_color);
975   }
976   auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
977   if (m_bpp == 8) {
978     if (!bitmap->Create(pixel_width, pixel_height, FXDIB_8bppMask))
979       return false;
980   } else {
981     if (!CreateCompatibleBitmap(bitmap, pixel_width, pixel_height))
982       return false;
983   }
984   if (!bitmap->HasAlpha() && !bitmap->IsAlphaMask()) {
985     bitmap->Clear(0xFFFFFFFF);
986     if (!GetDIBits(bitmap, bmp_rect.left, bmp_rect.top))
987       return false;
988   } else {
989     bitmap->Clear(0);
990     if (bitmap->m_pAlphaMask)
991       bitmap->m_pAlphaMask->Clear(0);
992   }
993   int dest_width = pixel_width;
994   int a = 0;
995   int r = 0;
996   int g = 0;
997   int b = 0;
998   if (anti_alias == FT_RENDER_MODE_LCD)
999     std::tie(a, r, g, b) = ArgbDecode(fill_color);
1000 
1001   for (const TextGlyphPos& glyph : glyphs) {
1002     if (!glyph.m_pGlyph)
1003       continue;
1004 
1005     Optional<CFX_Point> point = glyph.GetOrigin({pixel_left, pixel_top});
1006     if (!point.has_value())
1007       continue;
1008 
1009     const RetainPtr<CFX_DIBitmap>& pGlyph = glyph.m_pGlyph->GetBitmap();
1010     int ncols = pGlyph->GetWidth();
1011     int nrows = pGlyph->GetHeight();
1012     if (anti_alias == FT_RENDER_MODE_NORMAL) {
1013       if (!bitmap->CompositeMask(point.value().x, point.value().y, ncols, nrows,
1014                                  pGlyph, fill_color, 0, 0, BlendMode::kNormal,
1015                                  nullptr, false)) {
1016         return false;
1017       }
1018       continue;
1019     }
1020     bool bBGRStripe = !!(text_flags & FXTEXT_BGR_STRIPE);
1021     ncols /= 3;
1022     int x_subpixel = static_cast<int>(glyph.m_fOrigin.x * 3) % 3;
1023     int start_col = std::max(point->x, 0);
1024     FX_SAFE_INT32 end_col_safe = point->x;
1025     end_col_safe += ncols;
1026     if (!end_col_safe.IsValid())
1027       continue;
1028 
1029     int end_col = std::min<int>(end_col_safe.ValueOrDie(), dest_width);
1030     if (start_col >= end_col)
1031       continue;
1032 
1033     DrawNormalTextHelper(bitmap, pGlyph, nrows, point->x, point->y, start_col,
1034                          end_col, bNormal, bBGRStripe, x_subpixel, a, r, g, b);
1035   }
1036   if (bitmap->IsAlphaMask())
1037     SetBitMask(bitmap, bmp_rect.left, bmp_rect.top, fill_color);
1038   else
1039     SetDIBits(bitmap, bmp_rect.left, bmp_rect.top);
1040   return true;
1041 }
1042 
DrawTextPath(int nChars,const TextCharPos * pCharPos,CFX_Font * pFont,float font_size,const CFX_Matrix & mtText2User,const CFX_Matrix * pUser2Device,const CFX_GraphStateData * pGraphState,uint32_t fill_color,FX_ARGB stroke_color,CFX_PathData * pClippingPath,int nFlag)1043 bool CFX_RenderDevice::DrawTextPath(int nChars,
1044                                     const TextCharPos* pCharPos,
1045                                     CFX_Font* pFont,
1046                                     float font_size,
1047                                     const CFX_Matrix& mtText2User,
1048                                     const CFX_Matrix* pUser2Device,
1049                                     const CFX_GraphStateData* pGraphState,
1050                                     uint32_t fill_color,
1051                                     FX_ARGB stroke_color,
1052                                     CFX_PathData* pClippingPath,
1053                                     int nFlag) {
1054   for (int iChar = 0; iChar < nChars; ++iChar) {
1055     const TextCharPos& charpos = pCharPos[iChar];
1056     CFX_Matrix matrix;
1057     if (charpos.m_bGlyphAdjust) {
1058       matrix = CFX_Matrix(charpos.m_AdjustMatrix[0], charpos.m_AdjustMatrix[1],
1059                           charpos.m_AdjustMatrix[2], charpos.m_AdjustMatrix[3],
1060                           0, 0);
1061     }
1062     matrix.Concat(CFX_Matrix(font_size, 0, 0, font_size, charpos.m_Origin.x,
1063                              charpos.m_Origin.y));
1064     const CFX_PathData* pPath =
1065         pFont->LoadGlyphPath(charpos.m_GlyphIndex, charpos.m_FontCharWidth);
1066     if (!pPath)
1067       continue;
1068 
1069     matrix.Concat(mtText2User);
1070 
1071     CFX_PathData TransformedPath(*pPath);
1072     TransformedPath.Transform(matrix);
1073     if (fill_color || stroke_color) {
1074       int fill_mode = nFlag;
1075       if (fill_color)
1076         fill_mode |= FXFILL_WINDING;
1077       fill_mode |= FX_FILL_TEXT_MODE;
1078       if (!DrawPathWithBlend(&TransformedPath, pUser2Device, pGraphState,
1079                              fill_color, stroke_color, fill_mode,
1080                              BlendMode::kNormal)) {
1081         return false;
1082       }
1083     }
1084     if (pClippingPath)
1085       pClippingPath->Append(&TransformedPath, pUser2Device);
1086   }
1087   return true;
1088 }
1089 
DrawFillRect(const CFX_Matrix * pUser2Device,const CFX_FloatRect & rect,const FX_COLORREF & color)1090 void CFX_RenderDevice::DrawFillRect(const CFX_Matrix* pUser2Device,
1091                                     const CFX_FloatRect& rect,
1092                                     const FX_COLORREF& color) {
1093   CFX_PathData path;
1094   path.AppendFloatRect(rect);
1095   DrawPath(&path, pUser2Device, nullptr, color, 0, FXFILL_WINDING);
1096 }
1097 
DrawFillArea(const CFX_Matrix & mtUser2Device,const std::vector<CFX_PointF> & points,const FX_COLORREF & color)1098 void CFX_RenderDevice::DrawFillArea(const CFX_Matrix& mtUser2Device,
1099                                     const std::vector<CFX_PointF>& points,
1100                                     const FX_COLORREF& color) {
1101   ASSERT(!points.empty());
1102   CFX_PathData path;
1103   path.AppendPoint(points[0], FXPT_TYPE::MoveTo, false);
1104   for (size_t i = 1; i < points.size(); ++i)
1105     path.AppendPoint(points[i], FXPT_TYPE::LineTo, false);
1106 
1107   DrawPath(&path, &mtUser2Device, nullptr, color, 0, FXFILL_ALTERNATE);
1108 }
1109 
DrawStrokeRect(const CFX_Matrix & mtUser2Device,const CFX_FloatRect & rect,const FX_COLORREF & color,float fWidth)1110 void CFX_RenderDevice::DrawStrokeRect(const CFX_Matrix& mtUser2Device,
1111                                       const CFX_FloatRect& rect,
1112                                       const FX_COLORREF& color,
1113                                       float fWidth) {
1114   CFX_GraphStateData gsd;
1115   gsd.m_LineWidth = fWidth;
1116 
1117   CFX_PathData path;
1118   path.AppendFloatRect(rect);
1119   DrawPath(&path, &mtUser2Device, &gsd, 0, color, FXFILL_ALTERNATE);
1120 }
1121 
DrawStrokeLine(const CFX_Matrix * pUser2Device,const CFX_PointF & ptMoveTo,const CFX_PointF & ptLineTo,const FX_COLORREF & color,float fWidth)1122 void CFX_RenderDevice::DrawStrokeLine(const CFX_Matrix* pUser2Device,
1123                                       const CFX_PointF& ptMoveTo,
1124                                       const CFX_PointF& ptLineTo,
1125                                       const FX_COLORREF& color,
1126                                       float fWidth) {
1127   CFX_PathData path;
1128   path.AppendPoint(ptMoveTo, FXPT_TYPE::MoveTo, false);
1129   path.AppendPoint(ptLineTo, FXPT_TYPE::LineTo, false);
1130 
1131   CFX_GraphStateData gsd;
1132   gsd.m_LineWidth = fWidth;
1133 
1134   DrawPath(&path, pUser2Device, &gsd, 0, color, FXFILL_ALTERNATE);
1135 }
1136 
DrawFillRect(const CFX_Matrix * pUser2Device,const CFX_FloatRect & rect,const CFX_Color & color,int32_t nTransparency)1137 void CFX_RenderDevice::DrawFillRect(const CFX_Matrix* pUser2Device,
1138                                     const CFX_FloatRect& rect,
1139                                     const CFX_Color& color,
1140                                     int32_t nTransparency) {
1141   DrawFillRect(pUser2Device, rect, color.ToFXColor(nTransparency));
1142 }
1143 
DrawShadow(const CFX_Matrix & mtUser2Device,bool bVertical,bool bHorizontal,const CFX_FloatRect & rect,int32_t nTransparency,int32_t nStartGray,int32_t nEndGray)1144 void CFX_RenderDevice::DrawShadow(const CFX_Matrix& mtUser2Device,
1145                                   bool bVertical,
1146                                   bool bHorizontal,
1147                                   const CFX_FloatRect& rect,
1148                                   int32_t nTransparency,
1149                                   int32_t nStartGray,
1150                                   int32_t nEndGray) {
1151   float fStepGray = 1.0f;
1152 
1153   if (bVertical) {
1154     fStepGray = (nEndGray - nStartGray) / rect.Height();
1155 
1156     for (float fy = rect.bottom + 0.5f; fy <= rect.top - 0.5f; fy += 1.0f) {
1157       int32_t nGray = nStartGray + (int32_t)(fStepGray * (fy - rect.bottom));
1158       DrawStrokeLine(&mtUser2Device, CFX_PointF(rect.left, fy),
1159                      CFX_PointF(rect.right, fy),
1160                      ArgbEncode(nTransparency, nGray, nGray, nGray), 1.5f);
1161     }
1162   }
1163 
1164   if (bHorizontal) {
1165     fStepGray = (nEndGray - nStartGray) / rect.Width();
1166 
1167     for (float fx = rect.left + 0.5f; fx <= rect.right - 0.5f; fx += 1.0f) {
1168       int32_t nGray = nStartGray + (int32_t)(fStepGray * (fx - rect.left));
1169       DrawStrokeLine(&mtUser2Device, CFX_PointF(fx, rect.bottom),
1170                      CFX_PointF(fx, rect.top),
1171                      ArgbEncode(nTransparency, nGray, nGray, nGray), 1.5f);
1172     }
1173   }
1174 }
1175 
DrawBorder(const CFX_Matrix * pUser2Device,const CFX_FloatRect & rect,float fWidth,const CFX_Color & color,const CFX_Color & crLeftTop,const CFX_Color & crRightBottom,BorderStyle nStyle,int32_t nTransparency)1176 void CFX_RenderDevice::DrawBorder(const CFX_Matrix* pUser2Device,
1177                                   const CFX_FloatRect& rect,
1178                                   float fWidth,
1179                                   const CFX_Color& color,
1180                                   const CFX_Color& crLeftTop,
1181                                   const CFX_Color& crRightBottom,
1182                                   BorderStyle nStyle,
1183                                   int32_t nTransparency) {
1184   float fLeft = rect.left;
1185   float fRight = rect.right;
1186   float fTop = rect.top;
1187   float fBottom = rect.bottom;
1188 
1189   if (fWidth > 0.0f) {
1190     float fHalfWidth = fWidth / 2.0f;
1191 
1192     switch (nStyle) {
1193       default:
1194       case BorderStyle::SOLID: {
1195         CFX_PathData path;
1196         path.AppendRect(fLeft, fBottom, fRight, fTop);
1197         path.AppendRect(fLeft + fWidth, fBottom + fWidth, fRight - fWidth,
1198                         fTop - fWidth);
1199         DrawPath(&path, pUser2Device, nullptr, color.ToFXColor(nTransparency),
1200                  0, FXFILL_ALTERNATE);
1201         break;
1202       }
1203       case BorderStyle::DASH: {
1204         CFX_PathData path;
1205         path.AppendPoint(
1206             CFX_PointF(fLeft + fWidth / 2.0f, fBottom + fWidth / 2.0f),
1207             FXPT_TYPE::MoveTo, false);
1208         path.AppendPoint(
1209             CFX_PointF(fLeft + fWidth / 2.0f, fTop - fWidth / 2.0f),
1210             FXPT_TYPE::LineTo, false);
1211         path.AppendPoint(
1212             CFX_PointF(fRight - fWidth / 2.0f, fTop - fWidth / 2.0f),
1213             FXPT_TYPE::LineTo, false);
1214         path.AppendPoint(
1215             CFX_PointF(fRight - fWidth / 2.0f, fBottom + fWidth / 2.0f),
1216             FXPT_TYPE::LineTo, false);
1217         path.AppendPoint(
1218             CFX_PointF(fLeft + fWidth / 2.0f, fBottom + fWidth / 2.0f),
1219             FXPT_TYPE::LineTo, false);
1220 
1221         CFX_GraphStateData gsd;
1222         gsd.m_DashArray = {3.0f, 3.0f};
1223         gsd.m_DashPhase = 0;
1224         gsd.m_LineWidth = fWidth;
1225         DrawPath(&path, pUser2Device, &gsd, 0, color.ToFXColor(nTransparency),
1226                  FXFILL_WINDING);
1227         break;
1228       }
1229       case BorderStyle::BEVELED:
1230       case BorderStyle::INSET: {
1231         CFX_GraphStateData gsd;
1232         gsd.m_LineWidth = fHalfWidth;
1233 
1234         CFX_PathData pathLT;
1235 
1236         pathLT.AppendPoint(CFX_PointF(fLeft + fHalfWidth, fBottom + fHalfWidth),
1237                            FXPT_TYPE::MoveTo, false);
1238         pathLT.AppendPoint(CFX_PointF(fLeft + fHalfWidth, fTop - fHalfWidth),
1239                            FXPT_TYPE::LineTo, false);
1240         pathLT.AppendPoint(CFX_PointF(fRight - fHalfWidth, fTop - fHalfWidth),
1241                            FXPT_TYPE::LineTo, false);
1242         pathLT.AppendPoint(
1243             CFX_PointF(fRight - fHalfWidth * 2, fTop - fHalfWidth * 2),
1244             FXPT_TYPE::LineTo, false);
1245         pathLT.AppendPoint(
1246             CFX_PointF(fLeft + fHalfWidth * 2, fTop - fHalfWidth * 2),
1247             FXPT_TYPE::LineTo, false);
1248         pathLT.AppendPoint(
1249             CFX_PointF(fLeft + fHalfWidth * 2, fBottom + fHalfWidth * 2),
1250             FXPT_TYPE::LineTo, false);
1251         pathLT.AppendPoint(CFX_PointF(fLeft + fHalfWidth, fBottom + fHalfWidth),
1252                            FXPT_TYPE::LineTo, false);
1253 
1254         DrawPath(&pathLT, pUser2Device, &gsd,
1255                  crLeftTop.ToFXColor(nTransparency), 0, FXFILL_ALTERNATE);
1256 
1257         CFX_PathData pathRB;
1258         pathRB.AppendPoint(CFX_PointF(fRight - fHalfWidth, fTop - fHalfWidth),
1259                            FXPT_TYPE::MoveTo, false);
1260         pathRB.AppendPoint(
1261             CFX_PointF(fRight - fHalfWidth, fBottom + fHalfWidth),
1262             FXPT_TYPE::LineTo, false);
1263         pathRB.AppendPoint(CFX_PointF(fLeft + fHalfWidth, fBottom + fHalfWidth),
1264                            FXPT_TYPE::LineTo, false);
1265         pathRB.AppendPoint(
1266             CFX_PointF(fLeft + fHalfWidth * 2, fBottom + fHalfWidth * 2),
1267             FXPT_TYPE::LineTo, false);
1268         pathRB.AppendPoint(
1269             CFX_PointF(fRight - fHalfWidth * 2, fBottom + fHalfWidth * 2),
1270             FXPT_TYPE::LineTo, false);
1271         pathRB.AppendPoint(
1272             CFX_PointF(fRight - fHalfWidth * 2, fTop - fHalfWidth * 2),
1273             FXPT_TYPE::LineTo, false);
1274         pathRB.AppendPoint(CFX_PointF(fRight - fHalfWidth, fTop - fHalfWidth),
1275                            FXPT_TYPE::LineTo, false);
1276 
1277         DrawPath(&pathRB, pUser2Device, &gsd,
1278                  crRightBottom.ToFXColor(nTransparency), 0, FXFILL_ALTERNATE);
1279 
1280         CFX_PathData path;
1281 
1282         path.AppendRect(fLeft, fBottom, fRight, fTop);
1283         path.AppendRect(fLeft + fHalfWidth, fBottom + fHalfWidth,
1284                         fRight - fHalfWidth, fTop - fHalfWidth);
1285 
1286         DrawPath(&path, pUser2Device, &gsd, color.ToFXColor(nTransparency), 0,
1287                  FXFILL_ALTERNATE);
1288         break;
1289       }
1290       case BorderStyle::UNDERLINE: {
1291         CFX_PathData path;
1292         path.AppendPoint(CFX_PointF(fLeft, fBottom + fWidth / 2),
1293                          FXPT_TYPE::MoveTo, false);
1294         path.AppendPoint(CFX_PointF(fRight, fBottom + fWidth / 2),
1295                          FXPT_TYPE::LineTo, false);
1296 
1297         CFX_GraphStateData gsd;
1298         gsd.m_LineWidth = fWidth;
1299 
1300         DrawPath(&path, pUser2Device, &gsd, 0, color.ToFXColor(nTransparency),
1301                  FXFILL_ALTERNATE);
1302         break;
1303       }
1304     }
1305   }
1306 }
1307 
StateRestorer(CFX_RenderDevice * pDevice)1308 CFX_RenderDevice::StateRestorer::StateRestorer(CFX_RenderDevice* pDevice)
1309     : m_pDevice(pDevice) {
1310   m_pDevice->SaveState();
1311 }
1312 
~StateRestorer()1313 CFX_RenderDevice::StateRestorer::~StateRestorer() {
1314   m_pDevice->RestoreState(false);
1315 }
1316