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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ppapi/shared_impl/private/ppb_browser_font_trusted_shared.h" | 5 #include "ppapi/shared_impl/private/ppb_browser_font_trusted_shared.h" |
6 | 6 |
7 #include "base/string_util.h" | 7 #include "base/string_util.h" |
8 #include "base/utf_string_conversions.h" | 8 #include "base/utf_string_conversions.h" |
9 #include "ppapi/c/dev/ppb_font_dev.h" | 9 #include "ppapi/c/dev/ppb_font_dev.h" |
10 #include "ppapi/shared_impl/ppapi_preferences.h" | 10 #include "ppapi/shared_impl/ppapi_preferences.h" |
11 #include "ppapi/shared_impl/var.h" | 11 #include "ppapi/shared_impl/var.h" |
12 #include "ppapi/thunk/enter.h" | 12 #include "ppapi/thunk/enter.h" |
13 #include "ppapi/thunk/ppb_image_data_api.h" | 13 #include "ppapi/thunk/ppb_image_data_api.h" |
14 #include "ppapi/thunk/thunk.h" | 14 #include "ppapi/thunk/thunk.h" |
15 #include "skia/ext/platform_canvas.h" | 15 #include "skia/ext/platform_canvas.h" |
16 #include "third_party/skia/include/core/SkRect.h" | 16 #include "third_party/skia/include/core/SkRect.h" |
17 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h" | 17 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebCanvas.h" |
18 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFloatPoin
t.h" | 18 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFloatPoin
t.h" |
19 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFloatRect
.h" | 19 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFloatRect
.h" |
20 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebRect.h" | 20 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebRect.h" |
21 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFont.h" | 21 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFont.h" |
22 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFontDescription.h" | 22 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFontDescription.h" |
23 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextRun.h" | 23 #include "third_party/WebKit/Source/WebKit/chromium/public/WebTextRun.h" |
| 24 #include "unicode/ubidi.h" |
24 | 25 |
25 using ppapi::StringVar; | 26 using ppapi::StringVar; |
26 using ppapi::thunk::EnterResourceNoLock; | 27 using ppapi::thunk::EnterResourceNoLock; |
27 using ppapi::thunk::PPB_ImageData_API; | 28 using ppapi::thunk::PPB_ImageData_API; |
28 using WebKit::WebFloatPoint; | 29 using WebKit::WebFloatPoint; |
29 using WebKit::WebFloatRect; | 30 using WebKit::WebFloatRect; |
30 using WebKit::WebFont; | 31 using WebKit::WebFont; |
31 using WebKit::WebFontDescription; | 32 using WebKit::WebFontDescription; |
32 using WebKit::WebRect; | 33 using WebKit::WebRect; |
33 using WebKit::WebTextRun; | 34 using WebKit::WebTextRun; |
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44 string16 GetFontFromMap( | 45 string16 GetFontFromMap( |
45 const webkit_glue::WebPreferences::ScriptFontFamilyMap& map, | 46 const webkit_glue::WebPreferences::ScriptFontFamilyMap& map, |
46 const std::string& script) { | 47 const std::string& script) { |
47 webkit_glue::WebPreferences::ScriptFontFamilyMap::const_iterator it = | 48 webkit_glue::WebPreferences::ScriptFontFamilyMap::const_iterator it = |
48 map.find(script); | 49 map.find(script); |
49 if (it != map.end()) | 50 if (it != map.end()) |
50 return it->second; | 51 return it->second; |
51 return string16(); | 52 return string16(); |
52 } | 53 } |
53 | 54 |
| 55 // Splits a PP_BrowserFont_Trusted_TextRun into a sequence or LTR and RTL |
| 56 // WebTextRuns that can be used for WebKit. Normally WebKit does this for us, |
| 57 // but the font drawing and measurement routines we call happen after this |
| 58 // step. So for correct rendering of RTL content, we need to do it ourselves. |
| 59 class TextRunCollection { |
| 60 public: |
| 61 explicit TextRunCollection(const PP_BrowserFont_Trusted_TextRun& run) |
| 62 : bidi_(NULL), |
| 63 num_runs_(0) { |
| 64 StringVar* text_string = StringVar::FromPPVar(run.text); |
| 65 if (!text_string) |
| 66 return; // Leave num_runs_ = 0 so we'll do nothing. |
| 67 text_ = UTF8ToUTF16(text_string->value()); |
| 68 |
| 69 if (run.override_direction) { |
| 70 // Skip autodetection. |
| 71 num_runs_ = 1; |
| 72 override_run_ = WebTextRun(text_, PP_ToBool(run.rtl), true); |
| 73 } else { |
| 74 bidi_ = ubidi_open(); |
| 75 UErrorCode uerror = U_ZERO_ERROR; |
| 76 ubidi_setPara(bidi_, text_.data(), text_.size(), run.rtl, NULL, &uerror); |
| 77 if (U_SUCCESS(uerror)) |
| 78 num_runs_ = ubidi_countRuns(bidi_, &uerror); |
| 79 } |
| 80 } |
| 81 |
| 82 ~TextRunCollection() { |
| 83 if (bidi_) |
| 84 ubidi_close(bidi_); |
| 85 } |
| 86 |
| 87 const string16& text() const { return text_; } |
| 88 int num_runs() const { return num_runs_; } |
| 89 |
| 90 // Returns a WebTextRun with the info for the run at the given index. |
| 91 // The range covered by the run is in the two output params. |
| 92 WebTextRun GetRunAt(int index, int32_t* run_start, int32_t* run_len) const { |
| 93 DCHECK(index < num_runs_); |
| 94 if (bidi_) { |
| 95 bool run_rtl = !!ubidi_getVisualRun(bidi_, index, run_start, run_len); |
| 96 return WebTextRun(string16(&text_[*run_start], *run_len), |
| 97 run_rtl, true); |
| 98 } |
| 99 |
| 100 // Override run, return the single one. |
| 101 DCHECK(index == 0); |
| 102 *run_start = 0; |
| 103 *run_len = static_cast<int32_t>(text_.size()); |
| 104 return override_run_; |
| 105 } |
| 106 |
| 107 private: |
| 108 // Will be null if we skipped autodetection. |
| 109 UBiDi* bidi_; |
| 110 |
| 111 // Text of all the runs. |
| 112 string16 text_; |
| 113 |
| 114 int num_runs_; |
| 115 |
| 116 // When the content specifies override_direction (bidi_ is null) then this |
| 117 // will contain the single text run for WebKit. |
| 118 WebTextRun override_run_; |
| 119 |
| 120 DISALLOW_COPY_AND_ASSIGN(TextRunCollection); |
| 121 }; |
| 122 |
54 bool PPTextRunToWebTextRun(const PP_BrowserFont_Trusted_TextRun& text, | 123 bool PPTextRunToWebTextRun(const PP_BrowserFont_Trusted_TextRun& text, |
55 WebTextRun* run) { | 124 WebTextRun* run) { |
56 StringVar* text_string = StringVar::FromPPVar(text.text); | 125 StringVar* text_string = StringVar::FromPPVar(text.text); |
57 if (!text_string) | 126 if (!text_string) |
58 return false; | 127 return false; |
59 | 128 |
60 *run = WebTextRun(UTF8ToUTF16(text_string->value()), | 129 *run = WebTextRun(UTF8ToUTF16(text_string->value()), |
61 PP_ToBool(text.rtl), | 130 PP_ToBool(text.rtl), |
62 PP_ToBool(text.override_direction)); | 131 PP_ToBool(text.override_direction)); |
63 return true; | 132 return true; |
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273 const PP_BrowserFont_Trusted_TextRun* text) { | 342 const PP_BrowserFont_Trusted_TextRun* text) { |
274 WebTextRun run; | 343 WebTextRun run; |
275 if (!PPTextRunToWebTextRun(*text, &run)) | 344 if (!PPTextRunToWebTextRun(*text, &run)) |
276 return -1; | 345 return -1; |
277 return font_->calculateWidth(run); | 346 return font_->calculateWidth(run); |
278 } | 347 } |
279 | 348 |
280 uint32_t PPB_BrowserFont_Trusted_Shared::CharacterOffsetForPixel( | 349 uint32_t PPB_BrowserFont_Trusted_Shared::CharacterOffsetForPixel( |
281 const PP_BrowserFont_Trusted_TextRun* text, | 350 const PP_BrowserFont_Trusted_TextRun* text, |
282 int32_t pixel_position) { | 351 int32_t pixel_position) { |
283 WebTextRun run; | 352 TextRunCollection runs(*text); |
284 if (!PPTextRunToWebTextRun(*text, &run)) | 353 int32_t cur_pixel_offset = 0; |
285 return -1; | 354 for (int i = 0; i < runs.num_runs(); i++) { |
286 return static_cast<uint32_t>(font_->offsetForPosition( | 355 int32_t run_begin = 0; |
287 run, static_cast<float>(pixel_position))); | 356 int32_t run_len = 0; |
| 357 WebTextRun run = runs.GetRunAt(i, &run_begin, &run_len); |
| 358 int run_width = font_->calculateWidth(run); |
| 359 if (pixel_position < cur_pixel_offset + run_width) { |
| 360 // Offset is in this run. |
| 361 return static_cast<uint32_t>(font_->offsetForPosition( |
| 362 run, static_cast<float>(pixel_position - cur_pixel_offset))) + |
| 363 run_begin; |
| 364 } |
| 365 cur_pixel_offset += run_width; |
| 366 } |
| 367 return runs.text().size(); |
288 } | 368 } |
289 | 369 |
290 int32_t PPB_BrowserFont_Trusted_Shared::PixelOffsetForCharacter( | 370 int32_t PPB_BrowserFont_Trusted_Shared::PixelOffsetForCharacter( |
291 const PP_BrowserFont_Trusted_TextRun* text, | 371 const PP_BrowserFont_Trusted_TextRun* text, |
292 uint32_t char_offset) { | 372 uint32_t char_offset) { |
293 WebTextRun run; | 373 TextRunCollection runs(*text); |
294 if (!PPTextRunToWebTextRun(*text, &run)) | 374 int32_t cur_pixel_offset = 0; |
295 return -1; | 375 for (int i = 0; i < runs.num_runs(); i++) { |
296 if (char_offset >= run.text.length()) | 376 int32_t run_begin = 0; |
297 return -1; | 377 int32_t run_len = 0; |
298 | 378 WebTextRun run = runs.GetRunAt(i, &run_begin, &run_len); |
299 WebFloatRect rect = font_->selectionRectForText( | 379 if (char_offset >= static_cast<uint32_t>(run_begin) && |
300 run, WebFloatPoint(0.0f, 0.0f), font_->height(), 0, char_offset); | 380 char_offset < static_cast<uint32_t>(run_begin + run_len)) { |
301 return static_cast<int>(rect.width); | 381 // Character we're looking for is in this run. |
| 382 // |
| 383 // Here we ask WebKit to give us the rectangle around the character in |
| 384 // question, and then return the left edge. If we asked for a range of |
| 385 // 0 characters starting at the character in question, it would give us |
| 386 // a 0-width rect around the insertion point. But that will be on the |
| 387 // right side of the character for an RTL run, which would be wrong. |
| 388 WebFloatRect rect = font_->selectionRectForText( |
| 389 run, WebFloatPoint(0.0f, 0.0f), font_->height(), |
| 390 char_offset - run_begin, char_offset - run_begin + 1); |
| 391 return cur_pixel_offset + static_cast<int>(rect.x); |
| 392 } else { |
| 393 // Character is past this run, account for the pixels and continue |
| 394 // looking. |
| 395 cur_pixel_offset += font_->calculateWidth(run); |
| 396 } |
| 397 } |
| 398 return -1; // Requested a char beyond the end. |
302 } | 399 } |
303 | 400 |
304 void PPB_BrowserFont_Trusted_Shared::DrawTextToCanvas( | 401 void PPB_BrowserFont_Trusted_Shared::DrawTextToCanvas( |
305 skia::PlatformCanvas* destination, | 402 skia::PlatformCanvas* destination, |
306 const PP_BrowserFont_Trusted_TextRun& text, | 403 const PP_BrowserFont_Trusted_TextRun& text, |
307 const PP_Point* position, | 404 const PP_Point* position, |
308 uint32_t color, | 405 uint32_t color, |
309 const PP_Rect* clip, | 406 const PP_Rect* clip, |
310 PP_Bool image_data_is_opaque) { | 407 PP_Bool image_data_is_opaque) { |
311 WebTextRun run; | |
312 if (!PPTextRunToWebTextRun(text, &run)) | |
313 return; | |
314 | |
315 // Convert position and clip. | 408 // Convert position and clip. |
316 WebFloatPoint web_position(static_cast<float>(position->x), | 409 WebFloatPoint web_position(static_cast<float>(position->x), |
317 static_cast<float>(position->y)); | 410 static_cast<float>(position->y)); |
318 WebRect web_clip; | 411 WebRect web_clip; |
319 if (!clip) { | 412 if (!clip) { |
320 // Use entire canvas. SkCanvas doesn't have a size on it, so we just use | 413 // Use entire canvas. SkCanvas doesn't have a size on it, so we just use |
321 // the current clip bounds. | 414 // the current clip bounds. |
322 SkRect skclip; | 415 SkRect skclip; |
323 destination->getClipBounds(&skclip); | 416 destination->getClipBounds(&skclip); |
324 web_clip = WebRect(skclip.fLeft, skclip.fTop, skclip.fRight - skclip.fLeft, | 417 web_clip = WebRect(skclip.fLeft, skclip.fTop, skclip.fRight - skclip.fLeft, |
325 skclip.fBottom - skclip.fTop); | 418 skclip.fBottom - skclip.fTop); |
326 } else { | 419 } else { |
327 web_clip = WebRect(clip->point.x, clip->point.y, | 420 web_clip = WebRect(clip->point.x, clip->point.y, |
328 clip->size.width, clip->size.height); | 421 clip->size.width, clip->size.height); |
329 } | 422 } |
330 | 423 |
331 font_->drawText(destination, run, web_position, color, web_clip, | 424 TextRunCollection runs(text); |
332 PP_ToBool(image_data_is_opaque)); | 425 for (int i = 0; i < runs.num_runs(); i++) { |
| 426 int32_t run_begin = 0; |
| 427 int32_t run_len = 0; |
| 428 WebTextRun run = runs.GetRunAt(i, &run_begin, &run_len); |
| 429 font_->drawText(destination, run, web_position, color, web_clip, |
| 430 PP_ToBool(image_data_is_opaque)); |
| 431 |
| 432 // Advance to the next run. Note that we avoid doing this for the last run |
| 433 // since it's unnecessary, measuring text is slow, and most of the time |
| 434 // there will be only one run anyway. |
| 435 if (i != runs.num_runs() - 1) |
| 436 web_position.x += font_->calculateWidth(run); |
| 437 } |
333 } | 438 } |
334 | 439 |
335 } // namespace ppapi | 440 } // namespace ppapi |
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