Dear all,
What I am doing is to create an image of a string with a font (such as “NewText” with “Monaco”) and draw the image onto the screen.
And everything is going well when the image is small, but the image size becomes bigger when I enlarge the font size, and when the image width is larger than 170, the function CGContextDrawImage() crashes.
I have no idea why does this happen, and my source is basically written like below:
CGContextRef bitmapContext = CreateBitmapContext(textRect.size.width, textRect.size.height, bitmapData);
CGContextSelectFont(bitmapContext, fontNameArray, fontSize, kCGEncodingMacRoman);
CGContextSetCharacterSpacing (bitmapContext, 0.0);
CGContextSetTextDrawingMode (bitmapContext, kCGTextFill);
CGContextSetRGBFillColor (bitmapContext, strColor->red / 65535.0, strColor->green / 65535.0, strColor->blue / 65535.0, 1.0);
ATSUSetAttributes(...);
ATSUCreateTextLayoutWithTextPtr(...);
ATSUSetLayoutControls(atsulayout, ... , &&bitmapContext);
ATSUDrawText(atsulayout, ...)
// CGBitmapContextCreateImage() works perfect here on 10.4 but I cannot use CGBitmapContextCreateImage() on 10.3
CGBitmapContextGet...() // Get all param of the CGContextRef
providerRef = CGDataProviderCreateWithData(NULL, pSrcData, ulSrcDataSize, NULL);
cgImageRef = CGImageCreate(uiWidth, uiHeight, iBPCpnt, iBPPixel, uiSrcBPL, cs, bi, providerRef, 0, FALSE, kCGRenderingIntentDefault);
CGContextSaveGState(context);
// Do the transformation
DoTransformation(context, bounds); // Do some translate, rotate, scale, density-change
// Draw the image centered in the context
imageRect.origin.x = 0.0f;
imageRect.origin.y = 0.0f;
imageRect.size.width = CGImageGetWidth(cgImageRef);
imageRect.size.height = CGImageGetHeight(cgImageRef);
CGContextDrawImage(context, imageRect, cgImageRef);
// Restore our original graphics state.
CGContextRestoreGState(context);
Here is the crash report:
Thread 0 Crashed:
0 com.apple.CoreGraphics 0x936bb974 ARGB32_image_mark_RGB32 + 0x254
1 com.apple.CoreGraphics 0x936a0c88 ARGB32_image + 0x754
2 libRIP.A.dylib 0x907355ac ripd_Mark + 0x38
3 libRIP.A.dylib 0x90735e88 ripl_BltImage + 0x774
4 libRIP.A.dylib 0x90734b80 ripc_DrawImageObject + 0x688
5 libRIP.A.dylib 0x90736264 ripc_DrawImage + 0x144
6 com.apple.CoreGraphics 0x9369ee7c CGContextDrawImage + 0x17c
We have to support 10.3, so I have changed the way to get the CGImageRef. (Use CGImageCreate instead of CGBitmapContextCreateImage)
I doubt the way I use CGImageCreate() cause this crash, but it’s strange that when the font size is small, it works well.
So is there anyone here know why?
Thanks,
Best Regards,
Kevin
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