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 static Int32 reverseGamma = 0;
199
200 static UInt8 reverseGammaLut[256] = { 0 };
201
202 static inline UInt8* getReverseGammaLut() {
203 if (reverseGamma == 0) {
204 // initialize gamma lut
205 double gamma;
206 int i;
207 const char* pGammaEnv = getenv("J2D_LCD_REVERSE_GAMMA");
208 if (pGammaEnv != NULL) {
209 reverseGamma = atol(pGammaEnv);
210 }
211
212 if (reverseGamma < 100 || reverseGamma > 250) {
213 reverseGamma = 180;
214 }
215
216 gamma = 100.0 / reverseGamma;
217 for (i = 0; i < 256; i++) {
218 double x = ((double)i) / 255.0;
219 reverseGammaLut[i] = (UInt8)(255 * pow(x, gamma));
220 }
221 }
222 return reverseGammaLut;
223 }
224
225 static inline void
226 CGGI_CopyARGBPixelToRGBPixel(const UInt32 p, UInt8 *dst)
227 {
228 UInt8* lut = getReverseGammaLut();
229
230 *(dst + 0) = lut[0xFF - (p >> 16 & 0xFF)]; // red
231 *(dst + 1) = lut[0xFF - (p >> 8 & 0xFF)]; // green
232 *(dst + 2) = lut[0xFF - (p & 0xFF)]; // blue
233 }
234
235 static void
236 CGGI_CopyImageFromCanvasToRGBInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
237 {
238 UInt32 *src = (UInt32 *)canvas->image->data;
239 size_t srcRowWidth = canvas->image->width;
240
241 UInt8 *dest = (UInt8 *)info->image;
242 size_t destRowWidth = info->width;
243
244 size_t height = info->height;
245
246 size_t y;
247
248 // fill empty glyph image with black-on-white glyph
249 for (y = 0; y < height; y++) {
250 size_t destRow = y * destRowWidth * 3;
251 size_t srcRow = y * srcRowWidth;
252
253 size_t x;
254 for (x = 0; x < destRowWidth; x++) {
255 CGGI_CopyARGBPixelToRGBPixel(src[srcRow + x],
256 dest + destRow + x * 3);
257 }
258 }
259 }
260
261 //static void CGGI_copyImageFromCanvasToAlphaInfo
262 //(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
263 //{
264 // vImage_Buffer infoBuffer;
265 // infoBuffer.data = info->image;
266 // infoBuffer.width = info->width;
267 // infoBuffer.height = info->height;
268 // infoBuffer.rowBytes = info->width; // three bytes per RGB pixel
269 //
270 // UInt8 scrapPixel[info->width * info->height];
271 // vImage_Buffer scrapBuffer;
272 // scrapBuffer.data = &scrapPixel;
273 // scrapBuffer.width = info->width;
274 // scrapBuffer.height = info->height;
275 // scrapBuffer.rowBytes = info->width;
276 //
277 // vImageConvert_ARGB8888toPlanar8(canvas->image, &infoBuffer,
278 // &scrapBuffer, &scrapBuffer, &scrapBuffer, kvImageNoFlags);
279 //}
280
281 static inline UInt8
282 CGGI_ConvertBWPixelToByteGray(UInt32 p)
283 {
284 return 0xFF - (((p >> 24 & 0xFF) + (p >> 16 & 0xFF) + (p >> 8 & 0xFF)) / 3);
285 }
286
287 static void
288 CGGI_CopyImageFromCanvasToAlphaInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
289 {
290 UInt32 *src = (UInt32 *)canvas->image->data;
291 size_t srcRowWidth = canvas->image->width;
292
293 UInt8 *dest = (UInt8 *)info->image;
294 size_t destRowWidth = info->width;
295
296 size_t height = info->height;
297
298 size_t y;
299
300 // fill empty glyph image with black-on-white glyph
301 for (y = 0; y < height; y++) {
302 size_t destRow = y * destRowWidth;
303 size_t srcRow = y * srcRowWidth;
304 size_t x;
305 for (x = 0; x < destRowWidth; x++) {
306 UInt32 p = src[srcRow + x];
307 dest[destRow + x] = CGGI_ConvertBWPixelToByteGray(p);
308 }
309 }
310 }
311
312
313 #pragma mark --- Pixel Size, Modes, and Canvas Shaping Helper Functions ---
314
315 typedef struct CGGI_GlyphInfoDescriptor {
316 size_t pixelSize;
317 void (*copyFxnPtr)(CGGI_GlyphCanvas *canvas, GlyphInfo *info);
318 } CGGI_GlyphInfoDescriptor;
319
320 typedef struct CGGI_RenderingMode {
321 CGGI_GlyphInfoDescriptor *glyphDescriptor;
322 JRSFontRenderingStyle cgFontMode;
323 } CGGI_RenderingMode;
324
325 static CGGI_GlyphInfoDescriptor grey =
326 { 1, &CGGI_CopyImageFromCanvasToAlphaInfo };
327 static CGGI_GlyphInfoDescriptor rgb =
328 { 3, &CGGI_CopyImageFromCanvasToRGBInfo };
329
330 static inline CGGI_RenderingMode
331 CGGI_GetRenderingMode(const AWTStrike *strike)
332 {
333 CGGI_RenderingMode mode;
334 mode.cgFontMode = strike->fStyle;
335 NSException *e = nil;
336
337 switch (strike->fAAStyle) {
338 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_OFF:
339 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_ON:
340 mode.glyphDescriptor = &grey;
341 break;
342 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HRGB:
343 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HBGR:
344 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VRGB:
345 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VBGR:
346 mode.glyphDescriptor = &rgb;
347 break;
348 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_GASP:
349 case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_DEFAULT:
350 default:
351 /* we expect that text antialiasing hint has been already
352 * evaluated. Report an error if we get 'unevaluated' hint here.
353 */
354 e = [NSException
355 exceptionWithName:@"IllegalArgumentException"
356 reason:@"Invalid hint value"
357 userInfo:nil];
358 @throw e;
359 }
360
361 return mode;
362 }
363
364
365 #pragma mark --- Canvas Managment ---
366
367 /*
368 * Creates a new canvas of a fixed size, and initializes the CGContext as
369 * an 32-bit ARGB BitmapContext with some generic RGB color space.
370 */
371 static inline void
372 CGGI_InitCanvas(CGGI_GlyphCanvas *canvas,
373 const vImagePixelCount width, const vImagePixelCount height,
374 const CGGI_RenderingMode* mode)
375 {
376 // our canvas is *always* 4-byte ARGB
377 size_t bytesPerRow = width * sizeof(UInt32);
378 size_t byteCount = bytesPerRow * height;
379
380 canvas->image = malloc(sizeof(vImage_Buffer));
381 canvas->image->width = width;
382 canvas->image->height = height;
383 canvas->image->rowBytes = bytesPerRow;
384
385 canvas->image->data = (void *)calloc(byteCount, sizeof(UInt8));
386 if (canvas->image->data == NULL) {
387 [[NSException exceptionWithName:NSMallocException
388 reason:@"Failed to allocate memory for the buffer which backs the CGContext for glyph strikes." userInfo:nil] raise];
389 }
390
391 uint32_t bmpInfo = kCGImageAlphaPremultipliedFirst;
392 if (mode->glyphDescriptor == &rgb) {
393 bmpInfo |= kCGBitmapByteOrder32Host;
394 }
395
396 CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
397 canvas->context = CGBitmapContextCreate(canvas->image->data,
398 width, height, 8, bytesPerRow,
399 colorSpace,
400 bmpInfo);
401
402 // set foreground color
403 CGContextSetRGBFillColor(canvas->context, 0.0f, 0.0f, 0.0f, 1.0f);
404
405 CGContextSetFontSize(canvas->context, 1);
406 CGContextSaveGState(canvas->context);
407
408 CGColorSpaceRelease(colorSpace);
409 }
410
411 /*
412 * Releases the BitmapContext and the associated memory backing it.
413 */
414 static inline void
415 CGGI_FreeCanvas(CGGI_GlyphCanvas *canvas)
416 {
417 if (canvas->context != NULL) {
418 CGContextRelease(canvas->context);
419 }
420
421 if (canvas->image != NULL) {
422 if (canvas->image->data != NULL) {
423 free(canvas->image->data);
424 }
425 free(canvas->image);
426 }
427 }
428
429 /*
430 * This is the slack space that is preallocated for the global GlyphCanvas
431 * when it needs to be expanded. It has been set somewhat liberally to
432 * avoid re-upsizing frequently.
433 */
434 #define CGGI_GLYPH_CANVAS_SLACK 2.5
435
436 /*
437 * Quick and easy inline to check if this canvas is big enough.
438 */
439 static inline void
440 CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width,
441 const vImagePixelCount height,
442 const CGGI_RenderingMode* mode)
443 {
444 if (canvas->image != NULL &&
445 width < canvas->image->width &&
446 height < canvas->image->height)
447 {
448 return;
449 }
450
451 // if we don't have enough space to strike the largest glyph in the
452 // run, resize the canvas
453 CGGI_FreeCanvas(canvas);
454 CGGI_InitCanvas(canvas,
455 width * CGGI_GLYPH_CANVAS_SLACK,
456 height * CGGI_GLYPH_CANVAS_SLACK,
457 mode);
458 JRSFontSetRenderingStyleOnContext(canvas->context, mode->cgFontMode);
459 }
460
461 /*
462 * Clear the canvas by blitting white only into the region of interest
463 * (the rect which we will copy out of once the glyph is struck).
464 */
465 static inline void
466 CGGI_ClearCanvas(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
467 {
468 vImage_Buffer canvasRectToClear;
469 canvasRectToClear.data = canvas->image->data;
470 canvasRectToClear.height = info->height;
471 canvasRectToClear.width = info->width;
472 // use the row stride of the canvas, not the info
473 canvasRectToClear.rowBytes = canvas->image->rowBytes;
474
475 // clean the canvas
476 #ifdef CGGI_DEBUG
477 Pixel_8888 opaqueWhite = { 0xE0, 0xE0, 0xE0, 0xE0 };
478 #else
479 Pixel_8888 opaqueWhite = { 0xFF, 0xFF, 0xFF, 0xFF };
480 #endif
481
482 // clear canvas background and set foreground color
483 vImageBufferFill_ARGB8888(&canvasRectToClear, opaqueWhite, kvImageNoFlags);
484 }
485
486
487 #pragma mark --- GlyphInfo Creation & Copy Functions ---
488
489 /*
490 * Creates a GlyphInfo with exactly the correct size image and measurements.
491 */
492 #define CGGI_GLYPH_BBOX_PADDING 2.0f
493 static inline GlyphInfo *
494 CGGI_CreateNewGlyphInfoFrom(CGSize advance, CGRect bbox,
495 const AWTStrike *strike,
496 const CGGI_RenderingMode *mode)
497 {
498 size_t pixelSize = mode->glyphDescriptor->pixelSize;
499
500 // adjust the bounding box to be 1px bigger on each side than what
501 // CGFont-whatever suggests - because it gives a bounding box that
502 // is too tight
503 bbox.size.width += CGGI_GLYPH_BBOX_PADDING * 2.0f;
504 bbox.size.height += CGGI_GLYPH_BBOX_PADDING * 2.0f;
505 bbox.origin.x -= CGGI_GLYPH_BBOX_PADDING;
506 bbox.origin.y -= CGGI_GLYPH_BBOX_PADDING;
507
508 vImagePixelCount width = ceilf(bbox.size.width);
509 vImagePixelCount height = ceilf(bbox.size.height);
510
511 // if the glyph is larger than 1MB, don't even try...
512 // the GlyphVector path should have taken over by now
513 // and zero pixels is ok
514 if (width * height > 1024 * 1024) {
515 width = 1;
516 height = 1;
517 }
518 advance = CGSizeApplyAffineTransform(advance, strike->fFontTx);
519 if (!JRSFontStyleUsesFractionalMetrics(strike->fStyle)) {
520 advance.width = round(advance.width);
521 advance.height = round(advance.height);
522 }
523 advance = CGSizeApplyAffineTransform(advance, strike->fDevTx);
524
525 #ifdef USE_IMAGE_ALIGNED_MEMORY
526 // create separate memory
527 GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo));
528 void *image = (void *)malloc(height * width * pixelSize);
529 #else
530 // create a GlyphInfo struct fused to the image it points to
531 GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo) +
532 height * width * pixelSize);
533 #endif
534
535 glyphInfo->advanceX = advance.width;
536 glyphInfo->advanceY = advance.height;
537 glyphInfo->topLeftX = round(bbox.origin.x);
538 glyphInfo->topLeftY = round(bbox.origin.y);
539 glyphInfo->width = width;
540 glyphInfo->height = height;
541 glyphInfo->rowBytes = width * pixelSize;
542 glyphInfo->cellInfo = NULL;
543
544 #ifdef USE_IMAGE_ALIGNED_MEMORY
545 glyphInfo->image = image;
546 #else
547 glyphInfo->image = ((void *)glyphInfo) + sizeof(GlyphInfo);
548 #endif
549
550 return glyphInfo;
551 }
552
553
554 #pragma mark --- Glyph Striking onto Canvas ---
555
556 /*
557 * Clears the canvas, strikes the glyph with CoreGraphics, and then
558 * copies the struck pixels into the GlyphInfo image.
559 */
560 static inline void
561 CGGI_CreateImageForGlyph
562 (CGGI_GlyphCanvas *canvas, const CGGlyph glyph,
563 GlyphInfo *info, const CGGI_RenderingMode *mode)
564 {
565 // clean the canvas
566 CGGI_ClearCanvas(canvas, info);
567
568 if (isnan(info->topLeftX) || isnan(info->topLeftY)) {
569 return;
570 }
571 // strike the glyph in the upper right corner
572 CGContextShowGlyphsAtPoint(canvas->context,
573 -info->topLeftX,
574 canvas->image->height + info->topLeftY,
575 &glyph, 1);
576 // copy the glyph from the canvas into the info
577 (*mode->glyphDescriptor->copyFxnPtr)(canvas, info);
578 }
579
580 /*
581 * CoreText path...
582 */
583 static inline GlyphInfo *
584 CGGI_CreateImageForUnicode
585 (CGGI_GlyphCanvas *canvas, const AWTStrike *strike,
586 const CGGI_RenderingMode *mode, const UniChar uniChar)
587 {
588 // save the state of the world
589 CGContextSaveGState(canvas->context);
590
591 // get the glyph, measure it using CG
592 CGGlyph glyph;
593 CTFontRef fallback;
594 if (uniChar > 0xFFFF) {
595 UTF16Char charRef[2];
596 CTS_BreakupUnicodeIntoSurrogatePairs(uniChar, charRef);
597 CGGlyph glyphTmp[2];
598 fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, (CGGlyph *)&glyphTmp, 2);
599 glyph = glyphTmp[0];
600 } else {
601 UTF16Char charRef;
602 charRef = (UTF16Char) uniChar; // truncate.
603 fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, &glyph, 1);
604 }
605
606 CGAffineTransform tx = strike->fTx;
607 JRSFontRenderingStyle style = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
608
609 CGRect bbox;
610 JRSFontGetBoundingBoxesForGlyphsAndStyle(fallback, &tx, style, &glyph, 1, &bbox);
611
612 CGSize advance;
613 CTFontGetAdvancesForGlyphs(fallback, kCTFontDefaultOrientation, &glyph, &advance, 1);
614
615 // create the Sun2D GlyphInfo we are going to strike into
616 GlyphInfo *info = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
617
618 // fix the context size, just in case the substituted character is unexpectedly large
619 CGGI_SizeCanvas(canvas, info->width, info->height, mode);
620
621 // align the transform for the real CoreText strike
622 CGContextSetTextMatrix(canvas->context, strike->fAltTx);
623
624 const CGFontRef cgFallback = CTFontCopyGraphicsFont(fallback, NULL);
625 CGContextSetFont(canvas->context, cgFallback);
626 CFRelease(cgFallback);
627
628 // clean the canvas - align, strike, and copy the glyph from the canvas into the info
629 CGGI_CreateImageForGlyph(canvas, glyph, info, mode);
630
631 // restore the state of the world
632 CGContextRestoreGState(canvas->context);
633
634 CFRelease(fallback);
635 #ifdef CGGI_DEBUG
636 DUMP_GLYPHINFO(info);
637 #endif
638
639 #ifdef CGGI_DEBUG_DUMP
640 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
641 #if 0
642 PRINT_CGSTATES_INFO(NULL);
643 #endif
644 #endif
645
646 return info;
647 }
648
649
650 #pragma mark --- GlyphInfo Filling and Canvas Managment ---
651
652 /*
653 * Sets all the per-run properties for the canvas, and then iterates through
654 * the character run, and creates images in the GlyphInfo structs.
655 *
656 * Not inlined because it would create two copies in the function below
657 */
658 static void
659 CGGI_FillImagesForGlyphsWithSizedCanvas(CGGI_GlyphCanvas *canvas,
660 const AWTStrike *strike,
661 const CGGI_RenderingMode *mode,
662 jlong glyphInfos[],
663 const UniChar uniChars[],
664 const CGGlyph glyphs[],
665 const CFIndex len)
666 {
667 CGContextSetTextMatrix(canvas->context, strike->fAltTx);
668
669 CGContextSetFont(canvas->context, strike->fAWTFont->fNativeCGFont);
670 JRSFontSetRenderingStyleOnContext(canvas->context, strike->fStyle);
671
672 CFIndex i;
673 for (i = 0; i < len; i++) {
674 GlyphInfo *info = (GlyphInfo *)jlong_to_ptr(glyphInfos[i]);
675 if (info != NULL) {
676 CGGI_CreateImageForGlyph(canvas, glyphs[i], info, mode);
677 } else {
678 info = CGGI_CreateImageForUnicode(canvas, strike, mode, uniChars[i]);
679 glyphInfos[i] = ptr_to_jlong(info);
680 }
681 #ifdef CGGI_DEBUG
682 DUMP_GLYPHINFO(info);
683 #endif
684
685 #ifdef CGGI_DEBUG_DUMP
686 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
687 #endif
688 }
689 #ifdef CGGI_DEBUG_DUMP
690 DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
691 PRINT_CGSTATES_INFO(canvas->context);
692 #endif
693 }
694
695 static NSString *threadLocalAACanvasKey =
696 @"Java CoreGraphics Text Renderer Cached Canvas for AA";
697
698 static NSString *threadLocalLCDCanvasKey =
699 @"Java CoreGraphics Text Renderer Cached Canvas for LCD";
700
701 /*
702 * This is the maximum length and height times the above slack squared
703 * to determine if we go with the global canvas, or malloc one on the spot.
704 */
705 #define CGGI_GLYPH_CANVAS_MAX 100
706
707 /*
708 * Based on the space needed to strike the largest character in the run,
709 * either use the global shared canvas, or make one up on the spot, strike
710 * the glyphs, and destroy it.
711 */
712 static inline void
713 CGGI_FillImagesForGlyphs(jlong *glyphInfos, const AWTStrike *strike,
714 const CGGI_RenderingMode *mode,
715 const UniChar uniChars[], const CGGlyph glyphs[],
716 const size_t maxWidth, const size_t maxHeight,
717 const CFIndex len)
718 {
719 if (maxWidth*maxHeight*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK >
720 CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK)
721 {
722 CGGI_GlyphCanvas *tmpCanvas = [[CGGI_GlyphCanvas alloc] init];
723 CGGI_InitCanvas(tmpCanvas, maxWidth, maxHeight, mode);
724 CGGI_FillImagesForGlyphsWithSizedCanvas(tmpCanvas, strike,
725 mode, glyphInfos, uniChars,
726 glyphs, len);
727 CGGI_FreeCanvas(tmpCanvas);
728
729 [tmpCanvas release];
730 return;
731 }
732 NSMutableDictionary *threadDict =
733 [[NSThread currentThread] threadDictionary];
734
735 NSString* theKey = (mode->glyphDescriptor == &rgb) ?
736 threadLocalLCDCanvasKey : threadLocalAACanvasKey;
737
738 CGGI_GlyphCanvas *canvas = [threadDict objectForKey:theKey];
739 if (canvas == nil) {
740 canvas = [[CGGI_GlyphCanvas alloc] init];
741 [threadDict setObject:canvas forKey:theKey];
742 }
743
744 CGGI_SizeCanvas(canvas, maxWidth, maxHeight, mode);
745 CGGI_FillImagesForGlyphsWithSizedCanvas(canvas, strike, mode,
746 glyphInfos, uniChars, glyphs, len);
747 }
748
749 /*
750 * Finds the advances and bounding boxes of the characters in the run,
751 * cycles through all the bounds and calculates the maximum canvas space
752 * required by the largest glyph.
753 *
754 * Creates a GlyphInfo struct with a malloc that also encapsulates the
755 * image the struct points to. This is done to meet memory layout
756 * expectations in the Sun text rasterizer memory managment code.
757 * The image immediately follows the struct physically in memory.
758 */
759 static inline void
760 CGGI_CreateGlyphInfos(jlong *glyphInfos, const AWTStrike *strike,
761 const CGGI_RenderingMode *mode,
762 const UniChar uniChars[], const CGGlyph glyphs[],
763 CGSize advances[], CGRect bboxes[], const CFIndex len)
764 {
765 AWTFont *font = strike->fAWTFont;
766 CGAffineTransform tx = strike->fTx;
767 JRSFontRenderingStyle bboxCGMode = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
768
769 JRSFontGetBoundingBoxesForGlyphsAndStyle((CTFontRef)font->fFont, &tx, bboxCGMode, glyphs, len, bboxes);
770 CTFontGetAdvancesForGlyphs((CTFontRef)font->fFont, kCTFontDefaultOrientation, glyphs, advances, len);
771
772 size_t maxWidth = 1;
773 size_t maxHeight = 1;
774
775 CFIndex i;
776 for (i = 0; i < len; i++)
777 {
778 if (uniChars[i] != 0)
779 {
780 glyphInfos[i] = 0L;
781 continue; // will be handled later
782 }
783
784 CGSize advance = advances[i];
785 CGRect bbox = bboxes[i];
786
787 GlyphInfo *glyphInfo = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
788
789 if (maxWidth < glyphInfo->width) maxWidth = glyphInfo->width;
790 if (maxHeight < glyphInfo->height) maxHeight = glyphInfo->height;
791
792 glyphInfos[i] = ptr_to_jlong(glyphInfo);
793 }
794
795 CGGI_FillImagesForGlyphs(glyphInfos, strike, mode, uniChars,
796 glyphs, maxWidth, maxHeight, len);
797 }
798
799
800 #pragma mark --- Temporary Buffer Allocations and Initialization ---
801
802 /*
803 * This stage separates the already valid glyph codes from the unicode values
804 * that need special handling - the rawGlyphCodes array is no longer used
805 * after this stage.
806 */
807 static void
808 CGGI_CreateGlyphsAndScanForComplexities(jlong *glyphInfos,
809 const AWTStrike *strike,
810 const CGGI_RenderingMode *mode,
811 jint rawGlyphCodes[],
812 UniChar uniChars[], CGGlyph glyphs[],
813 CGSize advances[], CGRect bboxes[],
814 const CFIndex len)
815 {
816 CFIndex i;
817 for (i = 0; i < len; i++) {
818 jint code = rawGlyphCodes[i];
819 if (code < 0) {
820 glyphs[i] = 0;
821 uniChars[i] = -code;
822 } else {
823 glyphs[i] = code;
824 uniChars[i] = 0;
825 }
826 }
827
828 CGGI_CreateGlyphInfos(glyphInfos, strike, mode,
829 uniChars, glyphs, advances, bboxes, len);
830
831 #ifdef CGGI_DEBUG_HIT_COUNT
832 static size_t hitCount = 0;
833 hitCount++;
834 printf("%d\n", (int)hitCount);
835 #endif
836 }
837
838 /*
839 * Conditionally stack allocates buffers for glyphs, bounding boxes,
840 * and advances. Unfortunately to use CG or CT in bulk runs (which is
841 * faster than calling them per character), we have to copy into and out
842 * of these buffers. Still a net win though.
843 */
844 void
845 CGGlyphImages_GetGlyphImagePtrs(jlong glyphInfos[],
846 const AWTStrike *strike,
847 jint rawGlyphCodes[], const CFIndex len)
848 {
849 const CGGI_RenderingMode mode = CGGI_GetRenderingMode(strike);
850
851 if (len < MAX_STACK_ALLOC_GLYPH_BUFFER_SIZE) {
852 CGRect bboxes[len];
853 CGSize advances[len];
854 CGGlyph glyphs[len];
855 UniChar uniChars[len];
856
857 CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
858 rawGlyphCodes, uniChars, glyphs,
859 advances, bboxes, len);
860 return;
861 }
862
863 // just do one malloc, and carve it up for all the buffers
864 void *buffer = malloc(sizeof(CGRect) * sizeof(CGSize) *
865 sizeof(CGGlyph) * sizeof(UniChar) * len);
866 if (buffer == NULL) {
867 [[NSException exceptionWithName:NSMallocException
868 reason:@"Failed to allocate memory for the temporary glyph strike and measurement buffers." userInfo:nil] raise];
869 }
870
871 CGRect *bboxes = (CGRect *)(buffer);
872 CGSize *advances = (CGSize *)(bboxes + sizeof(CGRect) * len);
873 CGGlyph *glyphs = (CGGlyph *)(advances + sizeof(CGGlyph) * len);
874 UniChar *uniChars = (UniChar *)(glyphs + sizeof(UniChar) * len);
875
876 CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
877 rawGlyphCodes, uniChars, glyphs,
878 advances, bboxes, len);
879 free(buffer);
880 }