1 /*
2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #import <Accelerate/Accelerate.h> // for vImage_Buffer
27 #import <JavaNativeFoundation/JavaNativeFoundation.h>
28
29 #import "CGGlyphImages.h"
30 #import "CoreTextSupport.h"
31 #import "fontscalerdefs.h" // contains the definition of GlyphInfo struct
32
33 #import "sun_awt_SunHints.h"
34
35 //#define USE_IMAGE_ALIGNED_MEMORY 1
36 //#define CGGI_DEBUG 1
37 //#define CGGI_DEBUG_DUMP 1
38 //#define CGGI_DEBUG_HIT_COUNT 1
39
40 #define PRINT_TX(x) \
41 NSLog(@"(%f, %f, %f, %f, %f, %f)", x.a, x.b, x.c, x.d, x.tx, x.ty);
42
43 /*
44 * The GlyphCanvas is a global shared CGContext that characters are struck into.
45 * For each character, the glyph is struck, copied into a GlyphInfo struct, and
46 * the canvas is cleared for the next glyph.
47 *
48 * If the necessary canvas is too large, the shared one will not be used and a
49 * temporary one will be provided.
50 */
51 @interface CGGI_GlyphCanvas : NSObject {
52 @public
53 CGContextRef context;
54 vImage_Buffer *image;
55 }
56 @end;
57
58 @implementation CGGI_GlyphCanvas
59 @end
60
61
62 #pragma mark --- Debugging Helpers ---
63
64 /*
65 * These debug functions are only compiled when CGGI_DEBUG is activated.
66 * They will print out a full UInt8 canvas and any pixels struck (assuming
67 * the canvas is not too big).
68 *
69 * As another debug feature, the entire canvas will be filled with a light
70 * alpha value so it is easy to see where the glyph painting regions are
71 * at runtime.
72 */
73
74 #ifdef CGGI_DEBUG_DUMP
75 static void
76 DUMP_PIXELS(const char msg[], const UInt8 pixels[],
77 const size_t bytesPerPixel, const int width, const int height)
78 {
79 printf("| %s: (%d, %d)\n", msg, width, height);
80
81 if (width > 80 || height > 80) {
82 printf("| too big\n");
83 return;
84 }
85
86 size_t i, j = 0, k, size = width * height;
87 for (i = 0; i < size; i++) {
88 for (k = 0; k < bytesPerPixel; k++) {
89 if (pixels[i * bytesPerPixel + k] > 0x80) j++;
90 }
91 }
92
93 if (j == 0) {
94 printf("| empty\n");
95 return;
96 }
97
98 printf("|_");
99 int x, y;
100 for (x = 0; x < width; x++) {
101 printf("__");
102 }
103 printf("_\n");
104
105 for (y = 0; y < height; y++) {
106 printf("| ");
107 for (x = 0; x < width; x++) {
108 int p = 0;
109 for(k = 0; k < bytesPerPixel; k++) {
110 p += pixels[(y * width + x) * bytesPerPixel + k];
111 }
112
113 if (p < 0x80) {
114 printf(" ");
115 } else {
116 printf("[]");
117 }
118 }
119 printf(" |\n");
120 }
121 }
122
123 static void
124 DUMP_IMG_PIXELS(const char msg[], const vImage_Buffer *image)
125 {
126 const void *pixels = image->data;
127 const size_t pixelSize = image->rowBytes / image->width;
128 const size_t width = image->width;
129 const size_t height = image->height;
130
131 DUMP_PIXELS(msg, pixels, pixelSize, width, height);
132 }
133
134 static void
135 PRINT_CGSTATES_INFO(const CGContextRef cgRef)
136 {
137 // TODO(cpc): lots of SPI use in this method; remove/rewrite?
138 #if 0
139 CGRect clip = CGContextGetClipBoundingBox(cgRef);
140 fprintf(stderr, " clip: ((%f, %f), (%f, %f))\n",
141 clip.origin.x, clip.origin.y, clip.size.width, clip.size.height);
142
143 CGAffineTransform ctm = CGContextGetCTM(cgRef);
144 fprintf(stderr, " ctm: (%f, %f, %f, %f, %f, %f)\n",
145 ctm.a, ctm.b, ctm.c, ctm.d, ctm.tx, ctm.ty);
146
147 CGAffineTransform txtTx = CGContextGetTextMatrix(cgRef);
148 fprintf(stderr, " txtTx: (%f, %f, %f, %f, %f, %f)\n",
149 txtTx.a, txtTx.b, txtTx.c, txtTx.d, txtTx.tx, txtTx.ty);
150
151 if (CGContextIsPathEmpty(cgRef) == 0) {
152 CGPoint pathpoint = CGContextGetPathCurrentPoint(cgRef);
153 CGRect pathbbox = CGContextGetPathBoundingBox(cgRef);
154 fprintf(stderr, " [pathpoint: (%f, %f)] [pathbbox: ((%f, %f), (%f, %f))]\n",
155 pathpoint.x, pathpoint.y, pathbbox.origin.x, pathbbox.origin.y,
156 pathbbox.size.width, pathbbox.size.width);
157 }
158
159 CGFloat linewidth = CGContextGetLineWidth(cgRef);
160 CGLineCap linecap = CGContextGetLineCap(cgRef);
161 CGLineJoin linejoin = CGContextGetLineJoin(cgRef);
162 CGFloat miterlimit = CGContextGetMiterLimit(cgRef);
163 size_t dashcount = CGContextGetLineDashCount(cgRef);
164 fprintf(stderr, " [linewidth: %f] [linecap: %d] [linejoin: %d] [miterlimit: %f] [dashcount: %lu]\n",
165 linewidth, linecap, linejoin, miterlimit, (unsigned long)dashcount);
166
167 CGFloat smoothness = CGContextGetSmoothness(cgRef);
168 bool antialias = CGContextGetShouldAntialias(cgRef);
169 bool smoothfont = CGContextGetShouldSmoothFonts(cgRef);
170 JRSFontRenderingStyle fRendMode = CGContextGetFontRenderingMode(cgRef);
171 fprintf(stderr, " [smoothness: %f] [antialias: %d] [smoothfont: %d] [fontrenderingmode: %d]\n",
172 smoothness, antialias, smoothfont, fRendMode);
173 #endif
174 }
175 #endif
176
177 #ifdef CGGI_DEBUG
178
179 static void
180 DUMP_GLYPHINFO(const GlyphInfo *info)
181 {
182 printf("size: (%d, %d) pixelSize: %d\n",
183 info->width, info->height, info->rowBytes / info->width);
184 printf("adv: (%f, %f) top: (%f, %f)\n",
185 info->advanceX, info->advanceY, info->topLeftX, info->topLeftY);
186
187 #ifdef CGGI_DEBUG_DUMP
188 DUMP_PIXELS("Glyph Info Struct",
189 info->image, info->rowBytes / info->width,
190 info->width, info->height);
191 #endif
192 }
193
194 #endif
195
196
197 #pragma mark --- Font Rendering Mode Descriptors ---
198
199 static inline void
200 CGGI_CopyARGBPixelToRGBPixel(const UInt32 p, UInt8 *dst)
201 {
202 #if __LITTLE_ENDIAN__
203 *(dst + 2) = 0xFF - (p >> 16 & 0xFF);
204 *(dst + 1) = 0xFF - (p >> 8 & 0xFF);
205 *(dst) = 0xFF - (p & 0xFF);
206 #else
207 // TODO: check whether do we need big endian case
208 *(dst) = 0xFF - (p >> 16 & 0xFF);
209 *(dst + 1) = 0xFF - (p >> 8 & 0xFF);
210 *(dst + 2) = 0xFF - (p & 0xFF);
211 #endif
212 }
213
214 static void
215 CGGI_CopyImageFromCanvasToRGBInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
216 {
217 UInt32 *src = (UInt32 *)canvas->image->data;
218 size_t srcRowWidth = canvas->image->width;
219
220 UInt8 *dest = (UInt8 *)info->image;
221 size_t destRowWidth = info->width;
222
223 size_t height = info->height;
224
225 size_t y;
226 for (y = 0; y < height; y++) {
227 size_t destRow = y * destRowWidth * 3;
228 size_t srcRow = y * srcRowWidth;
229
230 size_t x;
231 for (x = 0; x < destRowWidth; x++) {
232 // size_t x3 = x * 3;
233 // UInt32 p = src[srcRow + x];
234 // dest[destRow + x3] = 0xFF - (p >> 16 & 0xFF);
235 // dest[destRow + x3 + 1] = 0xFF - (p >> 8 & 0xFF);
236 // dest[destRow + x3 + 2] = 0xFF - (p & 0xFF);
237 CGGI_CopyARGBPixelToRGBPixel(src[srcRow + x],
238 dest + destRow + x * 3);
239 }
240 }
241 }
242
243 //static void CGGI_copyImageFromCanvasToAlphaInfo
244 //(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
245 //{
246 // vImage_Buffer infoBuffer;
247 // infoBuffer.data = info->image;
248 // infoBuffer.width = info->width;
249 // infoBuffer.height = info->height;
250 // infoBuffer.rowBytes = info->width; // three bytes per RGB pixel
251 //
252 // UInt8 scrapPixel[info->width * info->height];
253 // vImage_Buffer scrapBuffer;
254 // scrapBuffer.data = &scrapPixel;
255 // scrapBuffer.width = info->width;
256 // scrapBuffer.height = info->height;
257 // scrapBuffer.rowBytes = info->width;
258 //
259 // vImageConvert_ARGB8888toPlanar8(canvas->image, &infoBuffer,
260 // &scrapBuffer, &scrapBuffer, &scrapBuffer, kvImageNoFlags);
261 //}
262
263 static inline UInt8
264 CGGI_ConvertPixelToGreyBit(UInt32 p)
265 {
266 #ifdef __LITTLE_ENDIAN__
267 return 0xFF - ((p >> 24 & 0xFF) + (p >> 16 & 0xFF) + (p >> 8 & 0xFF)) / 3;
268 #else
269 return 0xFF - ((p >> 16 & 0xFF) + (p >> 8 & 0xFF) + (p & 0xFF)) / 3;
270 #endif
271 }
272
273 static void
274 CGGI_CopyImageFromCanvasToAlphaInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
275 {
276 UInt32 *src = (UInt32 *)canvas->image->data;
277 size_t srcRowWidth = canvas->image->width;
278
279 UInt8 *dest = (UInt8 *)info->image;
280 size_t destRowWidth = info->width;
281
282 size_t height = info->height;
283
284 size_t y;
285 for (y = 0; y < height; y++) {
286 size_t destRow = y * destRowWidth;
287 size_t srcRow = y * srcRowWidth;
288
289 size_t x;
290 for (x = 0; x < destRowWidth; x++) {
291 UInt32 p = src[srcRow + x];
292 dest[destRow + x] = CGGI_ConvertPixelToGreyBit(p);
293 }
294 }
295 }
296
297
298 #pragma mark --- Pixel Size, Modes, and Canvas Shaping Helper Functions ---
299
300 typedef struct CGGI_GlyphInfoDescriptor {
301 size_t pixelSize;
302 void (*copyFxnPtr)(CGGI_GlyphCanvas *canvas, GlyphInfo *info);
303 } CGGI_GlyphInfoDescriptor;
304
305 typedef struct CGGI_RenderingMode {
306 CGGI_GlyphInfoDescriptor *glyphDescriptor;
307 JRSFontRenderingStyle cgFontMode;
308 } CGGI_RenderingMode;
309
310 static CGGI_GlyphInfoDescriptor grey =
311 { 1, &CGGI_CopyImageFromCanvasToAlphaInfo };
312 static CGGI_GlyphInfoDescriptor rgb =
313 { 3, &CGGI_CopyImageFromCanvasToRGBInfo };
314
315 static inline CGGI_RenderingMode
316 CGGI_GetRenderingMode(const AWTStrike *strike)
317 {
318 CGGI_RenderingMode mode;
319 mode.cgFontMode = strike->fStyle;
320
321 switch (strike->fAAStyle) {
322 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_OFF:
323 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_ON:
324 mode.glyphDescriptor = &grey;
325 break;
326 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HRGB:
327 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HBGR:
328 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VRGB:
329 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VBGR:
330 mode.glyphDescriptor = &rgb;
331 break;
332 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_GASP:
333 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_DEFAULT:
334 default:
335 // TODO: generate an error?
336 break;
337 }
338
339 return mode;
340 }
341
342
343 #pragma mark --- Canvas Managment ---
344
345 /*
346 * Creates a new canvas of a fixed size, and initializes the CGContext as
347 * an 32-bit ARGB BitmapContext with some generic RGB color space.
348 */
349 static inline void
350 CGGI_InitCanvas(CGGI_GlyphCanvas *canvas,
351 const vImagePixelCount width, const vImagePixelCount height,
352 const CGGI_RenderingMode* mode)
353 {
354 // our canvas is *always* 4-byte ARGB
355 size_t bytesPerRow = width * sizeof(UInt32);
356 size_t byteCount = bytesPerRow * height;
357
358 canvas->image = malloc(sizeof(vImage_Buffer));
359 canvas->image->width = width;
360 canvas->image->height = height;
361 canvas->image->rowBytes = bytesPerRow;
362
363 canvas->image->data = (void *)calloc(byteCount, sizeof(UInt32));
364 if (canvas->image->data == NULL) {
365 [[NSException exceptionWithName:NSMallocException
366 reason:@"Failed to allocate memory for the buffer which backs the CGContext for glyph strikes." userInfo:nil] raise];
367 }
368
369 uint32_t bmpInfo = kCGImageAlphaPremultipliedFirst;
370 if (mode->glyphDescriptor == &rgb) {
371 bmpInfo |= kCGBitmapByteOrder32Host;
372 }
373
374 CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
375 canvas->context = CGBitmapContextCreate(canvas->image->data,
376 width, height, 8, bytesPerRow,
377 colorSpace,
378 bmpInfo);
379
380 CGContextSetRGBFillColor(canvas->context, 0.0f, 0.0f, 0.0f, 1.0f);
381 CGContextSetFontSize(canvas->context, 1);
382 CGContextSaveGState(canvas->context);
383
384 CGColorSpaceRelease(colorSpace);
385 }
386
387 /*
388 * Releases the BitmapContext and the associated memory backing it.
389 */
390 static inline void
391 CGGI_FreeCanvas(CGGI_GlyphCanvas *canvas)
392 {
393 if (canvas->context != NULL) {
394 CGContextRelease(canvas->context);
395 }
396
397 if (canvas->image != NULL) {
398 if (canvas->image->data != NULL) {
399 free(canvas->image->data);
400 }
401 free(canvas->image);
402 }
403 }
404
405 /*
406 * This is the slack space that is preallocated for the global GlyphCanvas
407 * when it needs to be expanded. It has been set somewhat liberally to
408 * avoid re-upsizing frequently.
409 */
410 #define CGGI_GLYPH_CANVAS_SLACK 2.5
411
412 /*
413 * Quick and easy inline to check if this canvas is big enough.
414 */
415 static inline void
416 CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width, const vImagePixelCount height, const CGGI_RenderingMode* mode)
417 {
418 if (canvas->image != NULL &&
419 width < canvas->image->width &&
420 height < canvas->image->height)
421 {
422 return;
423 }
424
425 // if we don't have enough space to strike the largest glyph in the
426 // run, resize the canvas
427 CGGI_FreeCanvas(canvas);
428 CGGI_InitCanvas(canvas,
429 width * CGGI_GLYPH_CANVAS_SLACK,
430 height * CGGI_GLYPH_CANVAS_SLACK,
431 mode);
432 JRSFontSetRenderingStyleOnContext(canvas->context, mode->cgFontMode);
433 }
434
435 /*
436 * Clear the canvas by blitting white only into the region of interest
437 * (the rect which we will copy out of once the glyph is struck).
438 */
439 static inline void
440 CGGI_ClearCanvas(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
441 {
442 vImage_Buffer canvasRectToClear;
443 canvasRectToClear.data = canvas->image->data;
444 canvasRectToClear.height = info->height;
445 canvasRectToClear.width = info->width;
446 // use the row stride of the canvas, not the info
447 canvasRectToClear.rowBytes = canvas->image->rowBytes;
448
449 // clean the canvas
450 #ifdef CGGI_DEBUG
451 Pixel_8888 opaqueWhite = { 0xE0, 0xE0, 0xE0, 0xE0 };
452 #else
453 Pixel_8888 opaqueWhite = { 0xFF, 0xFF, 0xFF, 0xFF };
454 #endif
455
456 vImageBufferFill_ARGB8888(&canvasRectToClear, opaqueWhite, kvImageNoFlags);
457 }
458
459
460 #pragma mark --- GlyphInfo Creation & Copy Functions ---
461
462 /*
463 * Creates a GlyphInfo with exactly the correct size image and measurements.
464 */
465 #define CGGI_GLYPH_BBOX_PADDING 2.0f
466 static inline GlyphInfo *
467 CGGI_CreateNewGlyphInfoFrom(CGSize advance, CGRect bbox,
468 const AWTStrike *strike,
469 const CGGI_RenderingMode *mode)
470 {
471 size_t pixelSize = mode->glyphDescriptor->pixelSize;
472
473 // adjust the bounding box to be 1px bigger on each side than what
474 // CGFont-whatever suggests - because it gives a bounding box that
475 // is too tight
476 bbox.size.width += CGGI_GLYPH_BBOX_PADDING * 2.0f;
477 bbox.size.height += CGGI_GLYPH_BBOX_PADDING * 2.0f;
478 bbox.origin.x -= CGGI_GLYPH_BBOX_PADDING;
479 bbox.origin.y -= CGGI_GLYPH_BBOX_PADDING;
480
481 vImagePixelCount width = ceilf(bbox.size.width);
482 vImagePixelCount height = ceilf(bbox.size.height);
483
484 // if the glyph is larger than 1MB, don't even try...
485 // the GlyphVector path should have taken over by now
486 // and zero pixels is ok
487 if (width * height > 1024 * 1024) {
488 width = 1;
489 height = 1;
490 }
491 advance = CGSizeApplyAffineTransform(advance, strike->fFontTx);
492 if (!JRSFontStyleUsesFractionalMetrics(strike->fStyle)) {
493 advance.width = round(advance.width);
494 advance.height = round(advance.height);
495 }
496 advance = CGSizeApplyAffineTransform(advance, strike->fDevTx);
497
498 #ifdef USE_IMAGE_ALIGNED_MEMORY
499 // create separate memory
500 GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo));
501 void *image = (void *)malloc(height * width * pixelSize);
502 #else
503 // create a GlyphInfo struct fused to the image it points to
504 GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo) +
505 height * width * pixelSize);
506 #endif
507
508 glyphInfo->advanceX = advance.width;
509 glyphInfo->advanceY = advance.height;
510 glyphInfo->topLeftX = round(bbox.origin.x);
511 glyphInfo->topLeftY = round(bbox.origin.y);
512 glyphInfo->width = width;
513 glyphInfo->height = height;
514 glyphInfo->rowBytes = width * pixelSize;
515 glyphInfo->cellInfo = NULL;
516
517 #ifdef USE_IMAGE_ALIGNED_MEMORY
518 glyphInfo->image = image;
519 #else
520 glyphInfo->image = ((void *)glyphInfo) + sizeof(GlyphInfo);
521 #endif
522
523 return glyphInfo;
524 }
525
526
527 #pragma mark --- Glyph Striking onto Canvas ---
528
529 /*
530 * Clears the canvas, strikes the glyph with CoreGraphics, and then
531 * copies the struck pixels into the GlyphInfo image.
532 */
533 static inline void
534 CGGI_CreateImageForGlyph
535 (CGGI_GlyphCanvas *canvas, const CGGlyph glyph,
536 GlyphInfo *info, const CGGI_RenderingMode *mode)
537 {
538 // clean the canvas
539 CGGI_ClearCanvas(canvas, info);
540
541 // strike the glyph in the upper right corner
542 CGContextShowGlyphsAtPoint(canvas->context,
543 -info->topLeftX,
544 canvas->image->height + info->topLeftY,
545 &glyph, 1);
546
547 // copy the glyph from the canvas into the info
548 (*mode->glyphDescriptor->copyFxnPtr)(canvas, info);
549 }
550
551 /*
552 * CoreText path...
553 */
554 static inline GlyphInfo *
555 CGGI_CreateImageForUnicode
556 (CGGI_GlyphCanvas *canvas, const AWTStrike *strike,
557 const CGGI_RenderingMode *mode, const UniChar uniChar)
558 {
559 // save the state of the world
560 CGContextSaveGState(canvas->context);
561
562 // get the glyph, measure it using CG
563 CGGlyph glyph;
564 CTFontRef fallback;
565 if (uniChar > 0xFFFF) {
566 UTF16Char charRef[2];
567 CTS_BreakupUnicodeIntoSurrogatePairs(uniChar, charRef);
568 CGGlyph glyphTmp[2];
569 fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, (CGGlyph *)&glyphTmp, 2);
570 glyph = glyphTmp[0];
571 } else {
572 UTF16Char charRef;
573 charRef = (UTF16Char) uniChar; // truncate.
574 fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, &glyph, 1);
575 }
576
577 CGAffineTransform tx = strike->fTx;
578 JRSFontRenderingStyle style = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
579
580 CGRect bbox;
581 JRSFontGetBoundingBoxesForGlyphsAndStyle(fallback, &tx, style, &glyph, 1, &bbox);
582
583 CGSize advance;
584 CTFontGetAdvancesForGlyphs(fallback, kCTFontDefaultOrientation, &glyph, &advance, 1);
585
586 // create the Sun2D GlyphInfo we are going to strike into
587 GlyphInfo *info = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
588
589 // fix the context size, just in case the substituted character is unexpectedly large
590 CGGI_SizeCanvas(canvas, info->width, info->height, mode);
591
592 // align the transform for the real CoreText strike
593 CGContextSetTextMatrix(canvas->context, strike->fAltTx);
594
595 const CGFontRef cgFallback = CTFontCopyGraphicsFont(fallback, NULL);
596 CGContextSetFont(canvas->context, cgFallback);
597 CFRelease(cgFallback);
598
599 // clean the canvas - align, strike, and copy the glyph from the canvas into the info
600 CGGI_CreateImageForGlyph(canvas, glyph, info, mode);
601
602 // restore the state of the world
603 CGContextRestoreGState(canvas->context);
604
605 CFRelease(fallback);
606 #ifdef CGGI_DEBUG
607 DUMP_GLYPHINFO(info);
608 #endif
609
610 #ifdef CGGI_DEBUG_DUMP
611 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
612 #if 0
613 PRINT_CGSTATES_INFO(NULL);
614 #endif
615 #endif
616
617 return info;
618 }
619
620
621 #pragma mark --- GlyphInfo Filling and Canvas Managment ---
622
623 /*
624 * Sets all the per-run properties for the canvas, and then iterates through
625 * the character run, and creates images in the GlyphInfo structs.
626 *
627 * Not inlined because it would create two copies in the function below
628 */
629 static void
630 CGGI_FillImagesForGlyphsWithSizedCanvas(CGGI_GlyphCanvas *canvas,
631 const AWTStrike *strike,
632 const CGGI_RenderingMode *mode,
633 jlong glyphInfos[],
634 const UniChar uniChars[],
635 const CGGlyph glyphs[],
636 const CFIndex len)
637 {
638 CGContextSetTextMatrix(canvas->context, strike->fAltTx);
639
640 CGContextSetFont(canvas->context, strike->fAWTFont->fNativeCGFont);
641 JRSFontSetRenderingStyleOnContext(canvas->context, strike->fStyle);
642
643 CFIndex i;
644 for (i = 0; i < len; i++) {
645 GlyphInfo *info = (GlyphInfo *)jlong_to_ptr(glyphInfos[i]);
646 if (info != NULL) {
647 CGGI_CreateImageForGlyph(canvas, glyphs[i], info, mode);
648 } else {
649 info = CGGI_CreateImageForUnicode(canvas, strike, mode, uniChars[i]);
650 glyphInfos[i] = ptr_to_jlong(info);
651 }
652 #ifdef CGGI_DEBUG
653 DUMP_GLYPHINFO(info);
654 #endif
655
656 #ifdef CGGI_DEBUG_DUMP
657 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
658 #endif
659 }
660 #ifdef CGGI_DEBUG_DUMP
661 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
662 PRINT_CGSTATES_INFO(canvas->context);
663 #endif
664 }
665
666 static NSString *threadLocalAACanvasKey =
667 @"Java CoreGraphics Text Renderer Cached Canvas for AA";
668
669 static NSString *threadLocalLCDCanvasKey =
670 @"Java CoreGraphics Text Renderer Cached Canvas for LCD";
671
672 /*
673 * This is the maximum length and height times the above slack squared
674 * to determine if we go with the global canvas, or malloc one on the spot.
675 */
676 #define CGGI_GLYPH_CANVAS_MAX 100
677
678 /*
679 * Based on the space needed to strike the largest character in the run,
680 * either use the global shared canvas, or make one up on the spot, strike
681 * the glyphs, and destroy it.
682 */
683 static inline void
684 CGGI_FillImagesForGlyphs(jlong *glyphInfos, const AWTStrike *strike,
685 const CGGI_RenderingMode *mode,
686 const UniChar uniChars[], const CGGlyph glyphs[],
687 const size_t maxWidth, const size_t maxHeight,
688 const CFIndex len)
689 {
690 if (maxWidth*maxHeight*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK >
691 CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK)
692 {
693 CGGI_GlyphCanvas *tmpCanvas = [[CGGI_GlyphCanvas alloc] init];
694 CGGI_InitCanvas(tmpCanvas, maxWidth, maxHeight, mode);
695 CGGI_FillImagesForGlyphsWithSizedCanvas(tmpCanvas, strike,
696 mode, glyphInfos, uniChars,
697 glyphs, len);
698 CGGI_FreeCanvas(tmpCanvas);
699
700 [tmpCanvas release];
701 return;
702 }
703
704 NSMutableDictionary *threadDict =
705 [[NSThread currentThread] threadDictionary];
706
707 NSString* theKey;
708
709 if (mode->glyphDescriptor == &rgb) {
710 theKey = threadLocalLCDCanvasKey;
711 } else {
712 theKey = threadLocalAACanvasKey;
713 }
714
715 CGGI_GlyphCanvas *canvas = [threadDict objectForKey:theKey];
716 if (canvas == nil) {
717 canvas = [[CGGI_GlyphCanvas alloc] init];
718 [threadDict setObject:canvas forKey:theKey];
719 }
720
721 CGGI_SizeCanvas(canvas, maxWidth, maxHeight, mode);
722 CGGI_FillImagesForGlyphsWithSizedCanvas(canvas, strike, mode,
723 glyphInfos, uniChars, glyphs, len);
724 }
725
726 /*
727 * Finds the advances and bounding boxes of the characters in the run,
728 * cycles through all the bounds and calculates the maximum canvas space
729 * required by the largest glyph.
730 *
731 * Creates a GlyphInfo struct with a malloc that also encapsulates the
732 * image the struct points to. This is done to meet memory layout
733 * expectations in the Sun text rasterizer memory managment code.
734 * The image immediately follows the struct physically in memory.
735 */
736 static inline void
737 CGGI_CreateGlyphInfos(jlong *glyphInfos, const AWTStrike *strike,
738 const CGGI_RenderingMode *mode,
739 const UniChar uniChars[], const CGGlyph glyphs[],
740 CGSize advances[], CGRect bboxes[], const CFIndex len)
741 {
742 AWTFont *font = strike->fAWTFont;
743 CGAffineTransform tx = strike->fTx;
744 JRSFontRenderingStyle bboxCGMode = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
745
746 JRSFontGetBoundingBoxesForGlyphsAndStyle((CTFontRef)font->fFont, &tx, bboxCGMode, glyphs, len, bboxes);
747 CTFontGetAdvancesForGlyphs((CTFontRef)font->fFont, kCTFontDefaultOrientation, glyphs, advances, len);
748
749 size_t maxWidth = 1;
750 size_t maxHeight = 1;
751
752 CFIndex i;
753 for (i = 0; i < len; i++)
754 {
755 if (uniChars[i] != 0)
756 {
757 glyphInfos[i] = 0L;
758 continue; // will be handled later
759 }
760
761 CGSize advance = advances[i];
762 CGRect bbox = bboxes[i];
763
764 GlyphInfo *glyphInfo = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
765
766 if (maxWidth < glyphInfo->width) maxWidth = glyphInfo->width;
767 if (maxHeight < glyphInfo->height) maxHeight = glyphInfo->height;
768
769 glyphInfos[i] = ptr_to_jlong(glyphInfo);
770 }
771
772 CGGI_FillImagesForGlyphs(glyphInfos, strike, mode, uniChars,
773 glyphs, maxWidth, maxHeight, len);
774 }
775
776
777 #pragma mark --- Temporary Buffer Allocations and Initialization ---
778
779 /*
780 * This stage separates the already valid glyph codes from the unicode values
781 * that need special handling - the rawGlyphCodes array is no longer used
782 * after this stage.
783 */
784 static void
785 CGGI_CreateGlyphsAndScanForComplexities(jlong *glyphInfos,
786 const AWTStrike *strike,
787 const CGGI_RenderingMode *mode,
788 jint rawGlyphCodes[],
789 UniChar uniChars[], CGGlyph glyphs[],
790 CGSize advances[], CGRect bboxes[],
791 const CFIndex len)
792 {
793 CFIndex i;
794 for (i = 0; i < len; i++) {
795 jint code = rawGlyphCodes[i];
796 if (code < 0) {
797 glyphs[i] = 0;
798 uniChars[i] = -code;
799 } else {
800 glyphs[i] = code;
801 uniChars[i] = 0;
802 }
803 }
804
805 CGGI_CreateGlyphInfos(glyphInfos, strike, mode,
806 uniChars, glyphs, advances, bboxes, len);
807
808 #ifdef CGGI_DEBUG_HIT_COUNT
809 static size_t hitCount = 0;
810 hitCount++;
811 printf("%d\n", (int)hitCount);
812 #endif
813 }
814
815 /*
816 * Conditionally stack allocates buffers for glyphs, bounding boxes,
817 * and advances. Unfortunately to use CG or CT in bulk runs (which is
818 * faster than calling them per character), we have to copy into and out
819 * of these buffers. Still a net win though.
820 */
821 void
822 CGGlyphImages_GetGlyphImagePtrs(jlong glyphInfos[],
823 const AWTStrike *strike,
824 jint rawGlyphCodes[], const CFIndex len)
825 {
826 const CGGI_RenderingMode mode = CGGI_GetRenderingMode(strike);
827
828 if (len < MAX_STACK_ALLOC_GLYPH_BUFFER_SIZE) {
829 CGRect bboxes[len];
830 CGSize advances[len];
831 CGGlyph glyphs[len];
832 UniChar uniChars[len];
833
834 CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
835 rawGlyphCodes, uniChars, glyphs,
836 advances, bboxes, len);
837
838 return;
839 }
840
841 // just do one malloc, and carve it up for all the buffers
842 void *buffer = malloc(sizeof(CGRect) * sizeof(CGSize) *
843 sizeof(CGGlyph) * sizeof(UniChar) * len);
844 if (buffer == NULL) {
845 [[NSException exceptionWithName:NSMallocException
846 reason:@"Failed to allocate memory for the temporary glyph strike and measurement buffers." userInfo:nil] raise];
847 }
848
849 CGRect *bboxes = (CGRect *)(buffer);
850 CGSize *advances = (CGSize *)(bboxes + sizeof(CGRect) * len);
851 CGGlyph *glyphs = (CGGlyph *)(advances + sizeof(CGGlyph) * len);
852 UniChar *uniChars = (UniChar *)(glyphs + sizeof(UniChar) * len);
853
854 CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
855 rawGlyphCodes, uniChars, glyphs,
856 advances, bboxes, len);
857
858 free(buffer);
859 }