Java example source code file (CGGlyphImages.m)
The CGGlyphImages.m Java example source code
/*
* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#import <Accelerate/Accelerate.h> // for vImage_Buffer
#import <JavaNativeFoundation/JavaNativeFoundation.h>
#import "CGGlyphImages.h"
#import "CoreTextSupport.h"
#import "fontscalerdefs.h" // contains the definition of GlyphInfo struct
#import "sun_awt_SunHints.h"
//#define USE_IMAGE_ALIGNED_MEMORY 1
//#define CGGI_DEBUG 1
//#define CGGI_DEBUG_DUMP 1
//#define CGGI_DEBUG_HIT_COUNT 1
#define PRINT_TX(x) \
NSLog(@"(%f, %f, %f, %f, %f, %f)", x.a, x.b, x.c, x.d, x.tx, x.ty);
/*
* The GlyphCanvas is a global shared CGContext that characters are struck into.
* For each character, the glyph is struck, copied into a GlyphInfo struct, and
* the canvas is cleared for the next glyph.
*
* If the necessary canvas is too large, the shared one will not be used and a
* temporary one will be provided.
*/
@interface CGGI_GlyphCanvas : NSObject {
@public
CGContextRef context;
vImage_Buffer *image;
}
@end;
@implementation CGGI_GlyphCanvas
@end
#pragma mark --- Debugging Helpers ---
/*
* These debug functions are only compiled when CGGI_DEBUG is activated.
* They will print out a full UInt8 canvas and any pixels struck (assuming
* the canvas is not too big).
*
* As another debug feature, the entire canvas will be filled with a light
* alpha value so it is easy to see where the glyph painting regions are
* at runtime.
*/
#ifdef CGGI_DEBUG_DUMP
static void
DUMP_PIXELS(const char msg[], const UInt8 pixels[],
const size_t bytesPerPixel, const int width, const int height)
{
printf("| %s: (%d, %d)\n", msg, width, height);
if (width > 80 || height > 80) {
printf("| too big\n");
return;
}
size_t i, j = 0, k, size = width * height;
for (i = 0; i < size; i++) {
for (k = 0; k < bytesPerPixel; k++) {
if (pixels[i * bytesPerPixel + k] > 0x80) j++;
}
}
if (j == 0) {
printf("| empty\n");
return;
}
printf("|_");
int x, y;
for (x = 0; x < width; x++) {
printf("__");
}
printf("_\n");
for (y = 0; y < height; y++) {
printf("| ");
for (x = 0; x < width; x++) {
int p = 0;
for(k = 0; k < bytesPerPixel; k++) {
p += pixels[(y * width + x) * bytesPerPixel + k];
}
if (p < 0x80) {
printf(" ");
} else {
printf("[]");
}
}
printf(" |\n");
}
}
static void
DUMP_IMG_PIXELS(const char msg[], const vImage_Buffer *image)
{
const void *pixels = image->data;
const size_t pixelSize = image->rowBytes / image->width;
const size_t width = image->width;
const size_t height = image->height;
DUMP_PIXELS(msg, pixels, pixelSize, width, height);
}
static void
PRINT_CGSTATES_INFO(const CGContextRef cgRef)
{
// TODO(cpc): lots of SPI use in this method; remove/rewrite?
#if 0
CGRect clip = CGContextGetClipBoundingBox(cgRef);
fprintf(stderr, " clip: ((%f, %f), (%f, %f))\n",
clip.origin.x, clip.origin.y, clip.size.width, clip.size.height);
CGAffineTransform ctm = CGContextGetCTM(cgRef);
fprintf(stderr, " ctm: (%f, %f, %f, %f, %f, %f)\n",
ctm.a, ctm.b, ctm.c, ctm.d, ctm.tx, ctm.ty);
CGAffineTransform txtTx = CGContextGetTextMatrix(cgRef);
fprintf(stderr, " txtTx: (%f, %f, %f, %f, %f, %f)\n",
txtTx.a, txtTx.b, txtTx.c, txtTx.d, txtTx.tx, txtTx.ty);
if (CGContextIsPathEmpty(cgRef) == 0) {
CGPoint pathpoint = CGContextGetPathCurrentPoint(cgRef);
CGRect pathbbox = CGContextGetPathBoundingBox(cgRef);
fprintf(stderr, " [pathpoint: (%f, %f)] [pathbbox: ((%f, %f), (%f, %f))]\n",
pathpoint.x, pathpoint.y, pathbbox.origin.x, pathbbox.origin.y,
pathbbox.size.width, pathbbox.size.width);
}
CGFloat linewidth = CGContextGetLineWidth(cgRef);
CGLineCap linecap = CGContextGetLineCap(cgRef);
CGLineJoin linejoin = CGContextGetLineJoin(cgRef);
CGFloat miterlimit = CGContextGetMiterLimit(cgRef);
size_t dashcount = CGContextGetLineDashCount(cgRef);
fprintf(stderr, " [linewidth: %f] [linecap: %d] [linejoin: %d] [miterlimit: %f] [dashcount: %lu]\n",
linewidth, linecap, linejoin, miterlimit, (unsigned long)dashcount);
CGFloat smoothness = CGContextGetSmoothness(cgRef);
bool antialias = CGContextGetShouldAntialias(cgRef);
bool smoothfont = CGContextGetShouldSmoothFonts(cgRef);
JRSFontRenderingStyle fRendMode = CGContextGetFontRenderingMode(cgRef);
fprintf(stderr, " [smoothness: %f] [antialias: %d] [smoothfont: %d] [fontrenderingmode: %d]\n",
smoothness, antialias, smoothfont, fRendMode);
#endif
}
#endif
#ifdef CGGI_DEBUG
static void
DUMP_GLYPHINFO(const GlyphInfo *info)
{
printf("size: (%d, %d) pixelSize: %d\n",
info->width, info->height, info->rowBytes / info->width);
printf("adv: (%f, %f) top: (%f, %f)\n",
info->advanceX, info->advanceY, info->topLeftX, info->topLeftY);
#ifdef CGGI_DEBUG_DUMP
DUMP_PIXELS("Glyph Info Struct",
info->image, info->rowBytes / info->width,
info->width, info->height);
#endif
}
#endif
#pragma mark --- Font Rendering Mode Descriptors ---
static inline void
CGGI_CopyARGBPixelToRGBPixel(const UInt32 p, UInt8 *dst)
{
#if __LITTLE_ENDIAN__
*(dst + 2) = 0xFF - (p >> 24 & 0xFF);
*(dst + 1) = 0xFF - (p >> 16 & 0xFF);
*(dst) = 0xFF - (p >> 8 & 0xFF);
#else
*(dst) = 0xFF - (p >> 16 & 0xFF);
*(dst + 1) = 0xFF - (p >> 8 & 0xFF);
*(dst + 2) = 0xFF - (p & 0xFF);
#endif
}
static void
CGGI_CopyImageFromCanvasToRGBInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
{
UInt32 *src = (UInt32 *)canvas->image->data;
size_t srcRowWidth = canvas->image->width;
UInt8 *dest = (UInt8 *)info->image;
size_t destRowWidth = info->width;
size_t height = info->height;
size_t y;
for (y = 0; y < height; y++) {
size_t destRow = y * destRowWidth * 3;
size_t srcRow = y * srcRowWidth;
size_t x;
for (x = 0; x < destRowWidth; x++) {
// size_t x3 = x * 3;
// UInt32 p = src[srcRow + x];
// dest[destRow + x3] = 0xFF - (p >> 16 & 0xFF);
// dest[destRow + x3 + 1] = 0xFF - (p >> 8 & 0xFF);
// dest[destRow + x3 + 2] = 0xFF - (p & 0xFF);
CGGI_CopyARGBPixelToRGBPixel(src[srcRow + x],
dest + destRow + x * 3);
}
}
}
//static void CGGI_copyImageFromCanvasToAlphaInfo
//(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
//{
// vImage_Buffer infoBuffer;
// infoBuffer.data = info->image;
// infoBuffer.width = info->width;
// infoBuffer.height = info->height;
// infoBuffer.rowBytes = info->width; // three bytes per RGB pixel
//
// UInt8 scrapPixel[info->width * info->height];
// vImage_Buffer scrapBuffer;
// scrapBuffer.data = &scrapPixel;
// scrapBuffer.width = info->width;
// scrapBuffer.height = info->height;
// scrapBuffer.rowBytes = info->width;
//
// vImageConvert_ARGB8888toPlanar8(canvas->image, &infoBuffer,
// &scrapBuffer, &scrapBuffer, &scrapBuffer, kvImageNoFlags);
//}
static inline UInt8
CGGI_ConvertPixelToGreyBit(UInt32 p)
{
#ifdef __LITTLE_ENDIAN__
return 0xFF - ((p >> 24 & 0xFF) + (p >> 16 & 0xFF) + (p >> 8 & 0xFF)) / 3;
#else
return 0xFF - ((p >> 16 & 0xFF) + (p >> 8 & 0xFF) + (p & 0xFF)) / 3;
#endif
}
static void
CGGI_CopyImageFromCanvasToAlphaInfo(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
{
UInt32 *src = (UInt32 *)canvas->image->data;
size_t srcRowWidth = canvas->image->width;
UInt8 *dest = (UInt8 *)info->image;
size_t destRowWidth = info->width;
size_t height = info->height;
size_t y;
for (y = 0; y < height; y++) {
size_t destRow = y * destRowWidth;
size_t srcRow = y * srcRowWidth;
size_t x;
for (x = 0; x < destRowWidth; x++) {
UInt32 p = src[srcRow + x];
dest[destRow + x] = CGGI_ConvertPixelToGreyBit(p);
}
}
}
#pragma mark --- Pixel Size, Modes, and Canvas Shaping Helper Functions ---
typedef struct CGGI_GlyphInfoDescriptor {
size_t pixelSize;
void (*copyFxnPtr)(CGGI_GlyphCanvas *canvas, GlyphInfo *info);
} CGGI_GlyphInfoDescriptor;
typedef struct CGGI_RenderingMode {
CGGI_GlyphInfoDescriptor *glyphDescriptor;
JRSFontRenderingStyle cgFontMode;
} CGGI_RenderingMode;
static CGGI_GlyphInfoDescriptor grey =
{ 1, &CGGI_CopyImageFromCanvasToAlphaInfo };
static CGGI_GlyphInfoDescriptor rgb =
{ 3, &CGGI_CopyImageFromCanvasToRGBInfo };
static inline CGGI_RenderingMode
CGGI_GetRenderingMode(const AWTStrike *strike)
{
CGGI_RenderingMode mode;
mode.cgFontMode = strike->fStyle;
switch (strike->fAAStyle) {
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_DEFAULT:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_OFF:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_ON:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_GASP:
default:
mode.glyphDescriptor = &grey;
break;
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HRGB:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_HBGR:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VRGB:
case sun_awt_SunHints_INTVAL_TEXT_ANTIALIAS_LCD_VBGR:
mode.glyphDescriptor = &rgb;
break;
}
return mode;
}
#pragma mark --- Canvas Managment ---
/*
* Creates a new canvas of a fixed size, and initializes the CGContext as
* an 32-bit ARGB BitmapContext with some generic RGB color space.
*/
static inline void
CGGI_InitCanvas(CGGI_GlyphCanvas *canvas,
const vImagePixelCount width, const vImagePixelCount height)
{
// our canvas is *always* 4-byte ARGB
size_t bytesPerRow = width * sizeof(UInt32);
size_t byteCount = bytesPerRow * height;
canvas->image = malloc(sizeof(vImage_Buffer));
canvas->image->width = width;
canvas->image->height = height;
canvas->image->rowBytes = bytesPerRow;
canvas->image->data = (void *)calloc(byteCount, sizeof(UInt32));
if (canvas->image->data == NULL) {
[[NSException exceptionWithName:NSMallocException
reason:@"Failed to allocate memory for the buffer which backs the CGContext for glyph strikes." userInfo:nil] raise];
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
canvas->context = CGBitmapContextCreate(canvas->image->data,
width, height, 8, bytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedFirst);
CGContextSetRGBFillColor(canvas->context, 0.0f, 0.0f, 0.0f, 1.0f);
CGContextSetFontSize(canvas->context, 1);
CGContextSaveGState(canvas->context);
CGColorSpaceRelease(colorSpace);
}
/*
* Releases the BitmapContext and the associated memory backing it.
*/
static inline void
CGGI_FreeCanvas(CGGI_GlyphCanvas *canvas)
{
if (canvas->context != NULL) {
CGContextRelease(canvas->context);
}
if (canvas->image != NULL) {
if (canvas->image->data != NULL) {
free(canvas->image->data);
}
free(canvas->image);
}
}
/*
* This is the slack space that is preallocated for the global GlyphCanvas
* when it needs to be expanded. It has been set somewhat liberally to
* avoid re-upsizing frequently.
*/
#define CGGI_GLYPH_CANVAS_SLACK 2.5
/*
* Quick and easy inline to check if this canvas is big enough.
*/
static inline void
CGGI_SizeCanvas(CGGI_GlyphCanvas *canvas, const vImagePixelCount width, const vImagePixelCount height, const JRSFontRenderingStyle style)
{
if (canvas->image != NULL &&
width < canvas->image->width &&
height < canvas->image->height)
{
return;
}
// if we don't have enough space to strike the largest glyph in the
// run, resize the canvas
CGGI_FreeCanvas(canvas);
CGGI_InitCanvas(canvas,
width * CGGI_GLYPH_CANVAS_SLACK,
height * CGGI_GLYPH_CANVAS_SLACK);
JRSFontSetRenderingStyleOnContext(canvas->context, style);
}
/*
* Clear the canvas by blitting white only into the region of interest
* (the rect which we will copy out of once the glyph is struck).
*/
static inline void
CGGI_ClearCanvas(CGGI_GlyphCanvas *canvas, GlyphInfo *info)
{
vImage_Buffer canvasRectToClear;
canvasRectToClear.data = canvas->image->data;
canvasRectToClear.height = info->height;
canvasRectToClear.width = info->width;
// use the row stride of the canvas, not the info
canvasRectToClear.rowBytes = canvas->image->rowBytes;
// clean the canvas
#ifdef CGGI_DEBUG
Pixel_8888 opaqueWhite = { 0xE0, 0xE0, 0xE0, 0xE0 };
#else
Pixel_8888 opaqueWhite = { 0xFF, 0xFF, 0xFF, 0xFF };
#endif
vImageBufferFill_ARGB8888(&canvasRectToClear, opaqueWhite, kvImageNoFlags);
}
#pragma mark --- GlyphInfo Creation & Copy Functions ---
/*
* Creates a GlyphInfo with exactly the correct size image and measurements.
*/
#define CGGI_GLYPH_BBOX_PADDING 2.0f
static inline GlyphInfo *
CGGI_CreateNewGlyphInfoFrom(CGSize advance, CGRect bbox,
const AWTStrike *strike,
const CGGI_RenderingMode *mode)
{
size_t pixelSize = mode->glyphDescriptor->pixelSize;
// adjust the bounding box to be 1px bigger on each side than what
// CGFont-whatever suggests - because it gives a bounding box that
// is too tight
bbox.size.width += CGGI_GLYPH_BBOX_PADDING * 2.0f;
bbox.size.height += CGGI_GLYPH_BBOX_PADDING * 2.0f;
bbox.origin.x -= CGGI_GLYPH_BBOX_PADDING;
bbox.origin.y -= CGGI_GLYPH_BBOX_PADDING;
vImagePixelCount width = ceilf(bbox.size.width);
vImagePixelCount height = ceilf(bbox.size.height);
// if the glyph is larger than 1MB, don't even try...
// the GlyphVector path should have taken over by now
// and zero pixels is ok
if (width * height > 1024 * 1024) {
width = 1;
height = 1;
}
advance = CGSizeApplyAffineTransform(advance, strike->fFontTx);
if (!JRSFontStyleUsesFractionalMetrics(strike->fStyle)) {
advance.width = round(advance.width);
advance.height = round(advance.height);
}
advance = CGSizeApplyAffineTransform(advance, strike->fDevTx);
#ifdef USE_IMAGE_ALIGNED_MEMORY
// create separate memory
GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo));
void *image = (void *)malloc(height * width * pixelSize);
#else
// create a GlyphInfo struct fused to the image it points to
GlyphInfo *glyphInfo = (GlyphInfo *)malloc(sizeof(GlyphInfo) +
height * width * pixelSize);
#endif
glyphInfo->advanceX = advance.width;
glyphInfo->advanceY = advance.height;
glyphInfo->topLeftX = round(bbox.origin.x);
glyphInfo->topLeftY = round(bbox.origin.y);
glyphInfo->width = width;
glyphInfo->height = height;
glyphInfo->rowBytes = width * pixelSize;
glyphInfo->cellInfo = NULL;
#ifdef USE_IMAGE_ALIGNED_MEMORY
glyphInfo->image = image;
#else
glyphInfo->image = ((void *)glyphInfo) + sizeof(GlyphInfo);
#endif
return glyphInfo;
}
#pragma mark --- Glyph Striking onto Canvas ---
/*
* Clears the canvas, strikes the glyph with CoreGraphics, and then
* copies the struck pixels into the GlyphInfo image.
*/
static inline void
CGGI_CreateImageForGlyph
(CGGI_GlyphCanvas *canvas, const CGGlyph glyph,
GlyphInfo *info, const CGGI_RenderingMode *mode)
{
// clean the canvas
CGGI_ClearCanvas(canvas, info);
// strike the glyph in the upper right corner
CGContextShowGlyphsAtPoint(canvas->context,
-info->topLeftX,
canvas->image->height + info->topLeftY,
&glyph, 1);
// copy the glyph from the canvas into the info
(*mode->glyphDescriptor->copyFxnPtr)(canvas, info);
}
/*
* CoreText path...
*/
static inline GlyphInfo *
CGGI_CreateImageForUnicode
(CGGI_GlyphCanvas *canvas, const AWTStrike *strike,
const CGGI_RenderingMode *mode, const UniChar uniChar)
{
// save the state of the world
CGContextSaveGState(canvas->context);
// get the glyph, measure it using CG
CGGlyph glyph;
CTFontRef fallback;
if (uniChar > 0xFFFF) {
UTF16Char charRef[2];
CTS_BreakupUnicodeIntoSurrogatePairs(uniChar, charRef);
CGGlyph glyphTmp[2];
fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, (CGGlyph *)&glyphTmp, 2);
glyph = glyphTmp[0];
} else {
UTF16Char charRef;
charRef = (UTF16Char) uniChar; // truncate.
fallback = CTS_CopyCTFallbackFontAndGlyphForUnicode(strike->fAWTFont, (const UTF16Char *)&charRef, &glyph, 1);
}
CGAffineTransform tx = strike->fTx;
JRSFontRenderingStyle style = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
CGRect bbox;
JRSFontGetBoundingBoxesForGlyphsAndStyle(fallback, &tx, style, &glyph, 1, &bbox);
CGSize advance;
CTFontGetAdvancesForGlyphs(fallback, kCTFontDefaultOrientation, &glyph, &advance, 1);
// create the Sun2D GlyphInfo we are going to strike into
GlyphInfo *info = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
// fix the context size, just in case the substituted character is unexpectedly large
CGGI_SizeCanvas(canvas, info->width, info->height, mode->cgFontMode);
// align the transform for the real CoreText strike
CGContextSetTextMatrix(canvas->context, strike->fAltTx);
const CGFontRef cgFallback = CTFontCopyGraphicsFont(fallback, NULL);
CGContextSetFont(canvas->context, cgFallback);
CFRelease(cgFallback);
// clean the canvas - align, strike, and copy the glyph from the canvas into the info
CGGI_CreateImageForGlyph(canvas, glyph, info, mode);
// restore the state of the world
CGContextRestoreGState(canvas->context);
CFRelease(fallback);
#ifdef CGGI_DEBUG
DUMP_GLYPHINFO(info);
#endif
#ifdef CGGI_DEBUG_DUMP
DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
#if 0
PRINT_CGSTATES_INFO(NULL);
#endif
#endif
return info;
}
#pragma mark --- GlyphInfo Filling and Canvas Managment ---
/*
* Sets all the per-run properties for the canvas, and then iterates through
* the character run, and creates images in the GlyphInfo structs.
*
* Not inlined because it would create two copies in the function below
*/
static void
CGGI_FillImagesForGlyphsWithSizedCanvas(CGGI_GlyphCanvas *canvas,
const AWTStrike *strike,
const CGGI_RenderingMode *mode,
jlong glyphInfos[],
const UniChar uniChars[],
const CGGlyph glyphs[],
const CFIndex len)
{
CGContextSetTextMatrix(canvas->context, strike->fAltTx);
CGContextSetFont(canvas->context, strike->fAWTFont->fNativeCGFont);
JRSFontSetRenderingStyleOnContext(canvas->context, strike->fStyle);
CFIndex i;
for (i = 0; i < len; i++) {
GlyphInfo *info = (GlyphInfo *)jlong_to_ptr(glyphInfos[i]);
if (info != NULL) {
CGGI_CreateImageForGlyph(canvas, glyphs[i], info, mode);
} else {
info = CGGI_CreateImageForUnicode(canvas, strike, mode, uniChars[i]);
glyphInfos[i] = ptr_to_jlong(info);
}
#ifdef CGGI_DEBUG
DUMP_GLYPHINFO(info);
#endif
#ifdef CGGI_DEBUG_DUMP
DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
#endif
}
#ifdef CGGI_DEBUG_DUMP
DUMP_IMG_PIXELS("CGGI Canvas", canvas->image);
PRINT_CGSTATES_INFO(canvas->context);
#endif
}
static NSString *threadLocalCanvasKey =
@"Java CoreGraphics Text Renderer Cached Canvas";
/*
* This is the maximum length and height times the above slack squared
* to determine if we go with the global canvas, or malloc one on the spot.
*/
#define CGGI_GLYPH_CANVAS_MAX 100
/*
* Based on the space needed to strike the largest character in the run,
* either use the global shared canvas, or make one up on the spot, strike
* the glyphs, and destroy it.
*/
static inline void
CGGI_FillImagesForGlyphs(jlong *glyphInfos, const AWTStrike *strike,
const CGGI_RenderingMode *mode,
const UniChar uniChars[], const CGGlyph glyphs[],
const size_t maxWidth, const size_t maxHeight,
const CFIndex len)
{
if (maxWidth*maxHeight*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK >
CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_MAX*CGGI_GLYPH_CANVAS_SLACK*CGGI_GLYPH_CANVAS_SLACK)
{
CGGI_GlyphCanvas *tmpCanvas = [[CGGI_GlyphCanvas alloc] init];
CGGI_InitCanvas(tmpCanvas, maxWidth, maxHeight);
CGGI_FillImagesForGlyphsWithSizedCanvas(tmpCanvas, strike,
mode, glyphInfos, uniChars,
glyphs, len);
CGGI_FreeCanvas(tmpCanvas);
[tmpCanvas release];
return;
}
NSMutableDictionary *threadDict =
[[NSThread currentThread] threadDictionary];
CGGI_GlyphCanvas *canvas = [threadDict objectForKey:threadLocalCanvasKey];
if (canvas == nil) {
canvas = [[CGGI_GlyphCanvas alloc] init];
[threadDict setObject:canvas forKey:threadLocalCanvasKey];
}
CGGI_SizeCanvas(canvas, maxWidth, maxHeight, mode->cgFontMode);
CGGI_FillImagesForGlyphsWithSizedCanvas(canvas, strike, mode,
glyphInfos, uniChars, glyphs, len);
}
/*
* Finds the advances and bounding boxes of the characters in the run,
* cycles through all the bounds and calculates the maximum canvas space
* required by the largest glyph.
*
* Creates a GlyphInfo struct with a malloc that also encapsulates the
* image the struct points to. This is done to meet memory layout
* expectations in the Sun text rasterizer memory managment code.
* The image immediately follows the struct physically in memory.
*/
static inline void
CGGI_CreateGlyphInfos(jlong *glyphInfos, const AWTStrike *strike,
const CGGI_RenderingMode *mode,
const UniChar uniChars[], const CGGlyph glyphs[],
CGSize advances[], CGRect bboxes[], const CFIndex len)
{
AWTFont *font = strike->fAWTFont;
CGAffineTransform tx = strike->fTx;
JRSFontRenderingStyle bboxCGMode = JRSFontAlignStyleForFractionalMeasurement(strike->fStyle);
JRSFontGetBoundingBoxesForGlyphsAndStyle((CTFontRef)font->fFont, &tx, bboxCGMode, glyphs, len, bboxes);
CTFontGetAdvancesForGlyphs((CTFontRef)font->fFont, kCTFontDefaultOrientation, glyphs, advances, len);
size_t maxWidth = 1;
size_t maxHeight = 1;
CFIndex i;
for (i = 0; i < len; i++)
{
if (uniChars[i] != 0)
{
glyphInfos[i] = 0L;
continue; // will be handled later
}
CGSize advance = advances[i];
CGRect bbox = bboxes[i];
GlyphInfo *glyphInfo = CGGI_CreateNewGlyphInfoFrom(advance, bbox, strike, mode);
if (maxWidth < glyphInfo->width) maxWidth = glyphInfo->width;
if (maxHeight < glyphInfo->height) maxHeight = glyphInfo->height;
glyphInfos[i] = ptr_to_jlong(glyphInfo);
}
CGGI_FillImagesForGlyphs(glyphInfos, strike, mode, uniChars,
glyphs, maxWidth, maxHeight, len);
}
#pragma mark --- Temporary Buffer Allocations and Initialization ---
/*
* This stage separates the already valid glyph codes from the unicode values
* that need special handling - the rawGlyphCodes array is no longer used
* after this stage.
*/
static void
CGGI_CreateGlyphsAndScanForComplexities(jlong *glyphInfos,
const AWTStrike *strike,
const CGGI_RenderingMode *mode,
jint rawGlyphCodes[],
UniChar uniChars[], CGGlyph glyphs[],
CGSize advances[], CGRect bboxes[],
const CFIndex len)
{
CFIndex i;
for (i = 0; i < len; i++) {
jint code = rawGlyphCodes[i];
if (code < 0) {
glyphs[i] = 0;
uniChars[i] = -code;
} else {
glyphs[i] = code;
uniChars[i] = 0;
}
}
CGGI_CreateGlyphInfos(glyphInfos, strike, mode,
uniChars, glyphs, advances, bboxes, len);
#ifdef CGGI_DEBUG_HIT_COUNT
static size_t hitCount = 0;
hitCount++;
printf("%d\n", (int)hitCount);
#endif
}
/*
* Conditionally stack allocates buffers for glyphs, bounding boxes,
* and advances. Unfortunately to use CG or CT in bulk runs (which is
* faster than calling them per character), we have to copy into and out
* of these buffers. Still a net win though.
*/
void
CGGlyphImages_GetGlyphImagePtrs(jlong glyphInfos[],
const AWTStrike *strike,
jint rawGlyphCodes[], const CFIndex len)
{
const CGGI_RenderingMode mode = CGGI_GetRenderingMode(strike);
if (len < MAX_STACK_ALLOC_GLYPH_BUFFER_SIZE) {
CGRect bboxes[len];
CGSize advances[len];
CGGlyph glyphs[len];
UniChar uniChars[len];
CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
rawGlyphCodes, uniChars, glyphs,
advances, bboxes, len);
return;
}
// just do one malloc, and carve it up for all the buffers
void *buffer = malloc(sizeof(CGRect) * sizeof(CGSize) *
sizeof(CGGlyph) * sizeof(UniChar) * len);
if (buffer == NULL) {
[[NSException exceptionWithName:NSMallocException
reason:@"Failed to allocate memory for the temporary glyph strike and measurement buffers." userInfo:nil] raise];
}
CGRect *bboxes = (CGRect *)(buffer);
CGSize *advances = (CGSize *)(bboxes + sizeof(CGRect) * len);
CGGlyph *glyphs = (CGGlyph *)(advances + sizeof(CGGlyph) * len);
UniChar *uniChars = (UniChar *)(glyphs + sizeof(UniChar) * len);
CGGI_CreateGlyphsAndScanForComplexities(glyphInfos, strike, &mode,
rawGlyphCodes, uniChars, glyphs,
advances, bboxes, len);
free(buffer);
}
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