解决NSImage绘制的时候图像模糊

Mac下NSImage绘制模糊的原因之一是draw到了非整数像素上,框架在渲染的时候就会模糊. 针对这一原因写了以下工具:

/**
* @brief 一劳永逸的解决NSImage绘制的时候绘到浮点值像素上造成的图像模糊.
* @note 目前只hook了drawInRect:fromRect:operation:fraction:这个函数.
* @author hUyIncHun
*/ #import <Cocoa/Cocoa.h> @interface NSImage(dIR) + (void)doMyWork; @end
//
// NSImage+DrawSafely.m
// RTX
//
// Created by hUyIncHun on 13-10-24.
// #import "NSImage+DrawSafely.h"
#import <objc/runtime.h>
#import <objc/message.h> static IMP g_oldImp_drawInRect; static void newImp_drawInRect(id self, SEL _cmd, NSRect rect, NSRect rect2, NSCompositingOperation op, CGFloat f)
{
rect.origin.x = (int)rect.origin.x;
rect.origin.y = (int)rect.origin.y;
g_oldImp_drawInRect(self, _cmd, rect, rect2, op, f);
} @implementation NSImage(dIR) + (void)doMyWork
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken,^
{ g_oldImp_drawInRect =
method_setImplementation(
class_getInstanceMethod(self, @selector(drawInRect:fromRect:operation:fraction:))
, (IMP)newImp_drawInRect
);
});
} @end
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