/
images.m
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/
images.m
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#ifdef __APPLE__
#include <ApplicationServices/ApplicationServices.h>
#else
#include <CoreGraphics/CoreGraphics.h>
#endif
#include <Foundation/Foundation.h>
#ifndef MIN
#define MIN(x,y) ((x)<(y)?(x):(y))
#endif
static CGImageRef png, jpeg, tiff;
static CGImageRef worldmap;
void draw(CGContextRef ctx, CGRect rect)
{
CGContextSetRGBFillColor(ctx, 0.45, 0.45, 0.45, 1.0);
CGContextFillRect(ctx, rect);
// Draw a checkerboard
CGContextSetRGBFillColor(ctx, 0.4, 0.4, 0.4, 1.0);
unsigned int x, y;
for (x=0; x<rect.size.width; x+=10)
{
for (y=0; y<rect.size.height; y+=10)
{
if (((x % 20) == 0) != ((y % 20) == 0))
{
CGContextFillRect(ctx, CGRectMake(x, y, 10, 10));
}
}
}
if (nil == png)
{
CGDataProviderRef pngData = CGDataProviderCreateWithFilename("test.png");
png = CGImageCreateWithPNGDataProvider(pngData, NULL, YES, kCGRenderingIntentDefault);
CGDataProviderRelease(pngData);
}
CGRect pngRect = CGRectMake(0,0,rect.size.width/3,rect.size.height);
CGContextDrawImage(ctx, pngRect, png);
if (nil == jpeg)
{
CGDataProviderRef jpegData = CGDataProviderCreateWithFilename("test.jpg");
jpeg = CGImageCreateWithJPEGDataProvider(jpegData, NULL, YES, kCGRenderingIntentDefault);
CGDataProviderRelease(jpegData);
}
CGRect jpegRect = CGRectMake(rect.size.width/3,0,rect.size.width/3, rect.size.height);
CGContextDrawImage(ctx, jpegRect, jpeg);
if (nil == tiff)
{
CGDataProviderRef tiffData = CGDataProviderCreateWithFilename("test.tiff");
CGImageSourceRef tiffSource = CGImageSourceCreateWithDataProvider(tiffData, nil);
tiff = CGImageSourceCreateImageAtIndex(tiffSource, 0, nil);
CGDataProviderRelease(tiffData);
[tiffSource release];
}
CGRect tiffRect = CGRectMake((2*rect.size.width)/3,0,rect.size.width/3, rect.size.height);
CGContextDrawImage(ctx, tiffRect, tiff);
// Draw some sub-images
if (nil == worldmap)
{
CGDataProviderRef mapData = CGDataProviderCreateWithFilename("World_Map_1689.png");
CGImageSourceRef mapSource = CGImageSourceCreateWithDataProvider(mapData, nil);
worldmap = CGImageSourceCreateImageAtIndex(mapSource, 0, nil);
CGDataProviderRelease(mapData);
[mapSource release];
}
CGImageRef america = CGImageCreateWithImageInRect(worldmap, CGRectMake(14, 54, 126, 132));
CGRect americaRect = CGRectMake(rect.size.width/3,rect.size.height * 0.3,rect.size.width/3, rect.size.height * 0.7);
CGContextSaveGState(ctx);
CGContextSetAlpha(ctx, 0.25);
CGContextDrawImage(ctx,americaRect, america);
CGContextRestoreGState(ctx);
CGImageRelease(america);
}