bool GiCanvasIos::beginPaintBuffered(bool fast, bool autoscale)
{
if (m_draw->getContext() || !gs()
|| !m_draw->createBufferBitmap(m_draw->width(), m_draw->height(),
autoscale ? m_draw->_scale : 1.f)) {
return false;
}
RECT_2D clipBox = { 0, 0, m_draw->width(), m_draw->height() };
owner()->_beginPaint(clipBox);
m_draw->_fast = fast;
m_draw->_ctxused[0] = false;
m_draw->_ctxused[1] = false;
CGContextRef context = m_draw->getContext();
bool antiAlias = !fast && gs()->isAntiAliasMode();
CGContextSetAllowsAntialiasing(context, antiAlias);
CGContextSetShouldAntialias(context, antiAlias);
CGContextSetFlatness(context, fast ? 20 : 1);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineJoin(context, kCGLineJoinRound);
owner()->setMaxPenWidth(-1, 0.5f / m_draw->_scale);
return true;
}
bool GiCanvasIos::beginPaint(CGContextRef context, bool fast, bool buffered)
{
if (m_draw->getContext() || !context)
return false;
if (gs()) {
CGRect rc = CGContextGetClipBoundingBox(context);
RECT_2D clipBox = { rc.origin.x, rc.origin.y,
rc.origin.x + rc.size.width, rc.origin.y + rc.size.height };
owner()->_beginPaint(clipBox);
}
m_draw->_context = context;
m_draw->_fast = fast;
m_draw->_ctxused[0] = false;
m_draw->_ctxused[1] = false;
if (buffered && gs()) {
m_draw->createBufferBitmap(m_draw->width(), m_draw->height(), m_draw->_scale);
context = m_draw->getContext();
}
bool antiAlias = !fast && (!gs() || gs()->isAntiAliasMode());
CGContextSetAllowsAntialiasing(context, antiAlias);
CGContextSetShouldAntialias(context, antiAlias);
CGContextSetFlatness(context, fast ? 20 : 1);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineJoin(context, kCGLineJoinRound);
if (owner()) // 设置最小线宽为0.5像素，使用屏幕放大倍数以便得到实际像素值
owner()->setMaxPenWidth(-1, 0.5f / m_draw->_scale);
return true;
}
static void quartzPrepareLine (GraphicsScreen me) {
CGContextSetLineJoin (my d_macGraphicsContext, kCGLineJoinRound);
if (my duringXor) {
CGContextSetBlendMode (my d_macGraphicsContext, kCGBlendModeDifference);
CGContextSetAllowsAntialiasing (my d_macGraphicsContext, false);
CGContextSetRGBStrokeColor (my d_macGraphicsContext, 1.0, 1.0, 1.0, 1.0);
} else {
CGContextSetRGBStrokeColor (my d_macGraphicsContext, my d_macColour.red / 65536.0, my d_macColour.green / 65536.0, my d_macColour.blue / 65536.0, 1.0);
}
double lineWidth_pixels = LINE_WIDTH_IN_PIXELS (me);
CGContextSetLineWidth (my d_macGraphicsContext, lineWidth_pixels);
CGFloat lengths [4];
if (my lineType == Graphics_DOTTED)
lengths [0] = my resolution > 192 ? my resolution / 100.0 : 2,
lengths [1] = my resolution > 192 ? my resolution / 75.0 + lineWidth_pixels : 2;
if (my lineType == Graphics_DASHED)
lengths [0] = my resolution > 192 ? my resolution / 25 : 6,
lengths [1] = my resolution > 192 ? my resolution / 50.0 + lineWidth_pixels : 2;
if (my lineType == Graphics_DASHED_DOTTED)
lengths [0] = my resolution > 192 ? my resolution / 25 : 6,
lengths [1] = my resolution > 192 ? my resolution / 50.0 + lineWidth_pixels : 2;
lengths [2] = my resolution > 192 ? my resolution / 100.0 : 2;
lengths [3] = my resolution > 192 ? my resolution / 50.0 + lineWidth_pixels : 2;
CGContextSetLineDash (my d_macGraphicsContext, 0.0, my lineType == Graphics_DRAWN ? NULL : lengths, my lineType == 0 ? 0 : my lineType == Graphics_DASHED_DOTTED ? 4 : 2);
}
void GiCanvasIos::_antiAliasModeChanged(bool antiAlias)
{
if (m_draw->getContext()) {
antiAlias = !m_draw->_fast && antiAlias;
CGContextSetAllowsAntialiasing(m_draw->getContext(), antiAlias);
CGContextSetShouldAntialias(m_draw->getContext(), antiAlias);
}
}
//-----------------------------------------------------------------------------
void CGDrawContext::init ()
{
CGContextSaveGState (cgContext);
CGContextSetAllowsAntialiasing (cgContext, true);
CGContextSetAllowsFontSmoothing (cgContext, true);
CGContextSetAllowsFontSubpixelPositioning (cgContext, true);
CGContextSetAllowsFontSubpixelQuantization (cgContext, true);
CGContextSetShouldAntialias (cgContext, false);
CGContextSetFillColorSpace (cgContext, GetCGColorSpace ());
CGContextSetStrokeColorSpace (cgContext, GetCGColorSpace ());
CGContextSaveGState (cgContext);
CGAffineTransform cgCTM = CGAffineTransformMake (1.0, 0.0, 0.0, -1.0, 0.0, 0.0);
CGContextSetTextMatrix (cgContext, cgCTM);
CDrawContext::init ();
}
static void quartzRevertLine (GraphicsScreen me) {
if (my duringXor) {
CGContextSetBlendMode (my d_macGraphicsContext, kCGBlendModeNormal);
CGContextSetAllowsAntialiasing (my d_macGraphicsContext, true);
}
}
Memsubfont*
mksubfont(XFont *f, char *name, int lo, int hi, int size, int antialias)
{
CFStringRef s;
CGColorSpaceRef color;
CGContextRef ctxt;
CTFontRef font;
CTFontDescriptorRef desc;
CGRect bbox;
Memimage *m, *mc, *m1;
int x, y, y0;
int i, height, ascent;
Fontchar *fc, *fc0;
Memsubfont *sf;
CGFloat whitef[] = { 1.0, 1.0 };
CGColorRef white;
s = c2mac(name);
desc = CTFontDescriptorCreateWithNameAndSize(s, size);
CFRelease(s);
if(desc == nil)
return nil;
font = CTFontCreateWithFontDescriptor(desc, 0, nil);
CFRelease(desc);
if(font == nil)
return nil;
bbox = CTFontGetBoundingBox(font);
x = (int)(bbox.size.width*2 + 0.99999999);
fontheight(f, size, &height, &ascent);
y = height;
y0 = height - ascent;
m = allocmemimage(Rect(0, 0, x*(hi+1-lo)+1, y+1), GREY8);
if(m == nil)
return nil;
mc = allocmemimage(Rect(0, 0, x+1, y+1), GREY8);
if(mc == nil){
freememimage(m);
return nil;
}
memfillcolor(m, DBlack);
memfillcolor(mc, DBlack);
fc = malloc((hi+2 - lo) * sizeof fc[0]);
sf = malloc(sizeof *sf);
if(fc == nil || sf == nil) {
freememimage(m);
freememimage(mc);
free(fc);
free(sf);
return nil;
}
fc0 = fc;
color = CGColorSpaceCreateWithName(kCGColorSpaceGenericGray);
ctxt = CGBitmapContextCreate(byteaddr(mc, mc->r.min), Dx(mc->r), Dy(mc->r), 8,
mc->width*sizeof(u32int), color, kCGImageAlphaNone);
white = CGColorCreate(color, whitef);
CGColorSpaceRelease(color);
if(ctxt == nil) {
freememimage(m);
freememimage(mc);
free(fc);
free(sf);
return nil;
}
CGContextSetAllowsAntialiasing(ctxt, antialias);
CGContextSetTextPosition(ctxt, 0, 0); // XXX
#if OSX_VERSION >= 101400
CGContextSetAllowsFontSmoothing(ctxt, false);
#endif
x = 0;
for(i=lo; i<=hi; i++, fc++) {
char buf[20];
CFStringRef str;
CFDictionaryRef attrs;
CFAttributedStringRef attrString;
CTLineRef line;
CGRect r;
CGPoint p1;
CFStringRef keys[] = { kCTFontAttributeName, kCTForegroundColorAttributeName };
CFTypeRef values[] = { font, white };
sprint(buf, "%C", (Rune)mapUnicode(name, i));
str = c2mac(buf);
// See https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/CoreText_Programming/LayoutOperations/LayoutOperations.html#//apple_ref/doc/uid/TP40005533-CH12-SW2
attrs = CFDictionaryCreate(kCFAllocatorDefault, (const void**)&keys,
(const void**)&values, sizeof(keys) / sizeof(keys[0]),
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
attrString = CFAttributedStringCreate(kCFAllocatorDefault, str, attrs);
CFRelease(str);
CFRelease(attrs);
line = CTLineCreateWithAttributedString(attrString);
CGContextSetTextPosition(ctxt, 0, y0);
r = CTLineGetImageBounds(line, ctxt);
memfillcolor(mc, DBlack);
CTLineDraw(line, ctxt);
CFRelease(line);
fc->x = x;
fc->top = 0;
fc->bottom = Dy(m->r);
// fprint(2, "printed %#x: %g %g\n", mapUnicode(i), p1.x, p1.y);
p1 = CGContextGetTextPosition(ctxt);
if(p1.x <= 0 || mapUnicode(name, i) == 0xfffd) {
fc->width = 0;
fc->left = 0;
if(i == 0) {
drawpjw(m, fc, x, (int)(bbox.size.width + 0.99999999), y, y - y0);
x += fc->width;
}
continue;
}
memimagedraw(m, Rect(x, 0, x + p1.x, y), mc, ZP, memopaque, ZP, S);
fc->width = p1.x;
fc->left = 0;
x += p1.x;
}
fc->x = x;
// round up to 32-bit boundary
// so that in-memory data is same
// layout as in-file data.
if(x == 0)
x = 1;
if(y == 0)
y = 1;
if(antialias)
x += -x & 3;
else
x += -x & 31;
m1 = allocmemimage(Rect(0, 0, x, y), antialias ? GREY8 : GREY1);
memimagedraw(m1, m1->r, m, m->r.min, memopaque, ZP, S);
freememimage(m);
freememimage(mc);
sf->name = nil;
sf->n = hi+1 - lo;
sf->height = Dy(m1->r);
sf->ascent = Dy(m1->r) - y0;
sf->info = fc0;
sf->bits = m1;
return sf;
}