ios 简单滤镜效果
#import "ImageUtil.h"
#include <sys/time.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
// 1返回一个使用RGBA通道的位图上下文
static CGContextRef CreateRGBABitmapContext (CGImageRef inImage)
{
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
void *bitmapData; //内存空间的指针，该内存空间的大小等于图像使用RGB通道所占用的字节数。
int bitmapByteCount;
int bitmapBytesPerRow;
size_t pixelsWide = CGImageGetWidth(inImage); //获取横向的像素点的个数
size_t pixelsHigh = CGImageGetHeight(inImage);
bitmapBytesPerRow = (pixelsWide * 4); //每一行的像素点占用的字节数，每个像素点的ARGB四个通道各占8个bit(0-255)的空间
bitmapByteCount = (bitmapBytesPerRow * pixelsHigh); //计算整张图占用的字节数
colorSpace = CGColorSpaceCreateDeviceRGB();//创建依赖于设备的RGB通道
//分配足够容纳图片字节数的内存空间
bitmapData = malloc( bitmapByteCount );
//创建CoreGraphic的图形上下文，该上下文描述了bitmaData指向的内存空间需要绘制的图像的一些绘制参数
context = CGBitmapContextCreate (bitmapData,
pixelsWide,
pixelsHigh,
8,
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast);
//Core Foundation中通过含有Create、Alloc的方法名字创建的指针，需要使用CFRelease()函数释放
CGColorSpaceRelease( colorSpace );
return context;
}
// 2返回一个指针，该指针指向一个数组，数组中的每四个元素都是图像上的一个像素点的RGBA的数值(0-255)，用无符号的char是因为它正好的取值范围就是0-255
static unsigned char *RequestImagePixelData(UIImage *inImage)
{
CGImageRef img = [inImage CGImage];
CGSize size = [inImage size];
//使用上面的函数创建上下文
CGContextRef cgctx = CreateRGBABitmapContext(img);
CGRect rect = {{0,0},{size.width, size.height}};
//将目标图像绘制到指定的上下文，实际为上下文内的bitmapData。
CGContextDrawImage(cgctx, rect, img);
unsigned char *data = CGBitmapContextGetData (cgctx);
//释放上面的函数创建的上下文
CGContextRelease(cgctx);
return data;
}
//3修改RGB的值
static void changeRGBA(int *red,int *green,int *blue,int *alpha, const float* f){
int redV=*red;
int greenV=*green;
int blueV=*blue;
int alphaV=*alpha;
*red=f[0]*redV+f[1]*greenV+f[2]*blueV+f[3]*alphaV+f[4];
*green=f[0+5]*redV+f[1+5]*greenV+f[2+5]*blueV+f[3+5]*alphaV+f[4+5];
*blue=f[0+5*2]*redV+f[1+5*2]*greenV+f[2+5*2]*blueV+f[3+5*2]*alphaV+f[4+5*2];
*alpha=f[0+5*3]*redV+f[1+5*3]*greenV+f[2+5*3]*blueV+f[3+5*3]*alphaV+f[4+5*3];
if (*red>255) {
*red=255;
}
if(*red<0){
*red=0;
}
if (*green>255) {
*green=255;
}
if (*green<0) {
*green=0;
}
if (*blue>255) {
*blue=255;
}
if (*blue<0) {
*blue=0;
}
if (*alpha>255) {
*alpha=255;
}
if (*alpha<0) {
*alpha=0;
}
}
#pragma mark -
@implementation ImageUtil
#pragma mark -
+ (UIImage*)processImage:(UIImage*)inImage withColorMatrix:(const float*) f
{
unsigned char *imgPixel = RequestImagePixelData(inImage);
CGImageRef inImageRef = [inImage CGImage];
GLuint w = CGImageGetWidth(inImageRef);
GLuint h = CGImageGetHeight(inImageRef);
int wOff = 0;
int pixOff = 0;
//双层循环按照长宽的像素个数迭代每个像素点
for(GLuint y = 0;y< h;y++)
{
pixOff = wOff;
for (GLuint x = 0; x<w; x++)
{
int red = (unsigned char)imgPixel[pixOff];
int green = (unsigned char)imgPixel[pixOff+1];
int blue = (unsigned char)imgPixel[pixOff+2];
int alpha=(unsigned char)imgPixel[pixOff+3];
changeRGBA(&red, &green, &blue, &alpha, f);
//回写数据
imgPixel[pixOff] = red;
imgPixel[pixOff+1] = green;
imgPixel[pixOff+2] = blue;
imgPixel[pixOff+3] = alpha;
//将数组的索引指向下四个元素
pixOff += 4;
}
wOff += w * 4;
}
NSInteger dataLength = w*h* 4;
//下面的代码创建要输出的图像的相关参数
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, imgPixel, dataLength, NULL);
// prep the ingredients
int bitsPerComponent = 8;
int bitsPerPixel = 32;
int bytesPerRow = 4 * w;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
//创建要输出的图像
CGImageRef imageRef = CGImageCreate(w, h,
bitsPerComponent,
bitsPerPixel,
bytesPerRow,
colorSpaceRef,
bitmapInfo,
provider,
NULL, NO, renderingIntent);
UIImage *my_Image = [UIImage imageWithCGImage:imageRef];
CFRelease(imageRef);
CGColorSpaceRelease(colorSpaceRef);
CGDataProviderRelease(provider);
return my_Image;
}
//-----------颜色处理-----
#ifndef ImageProcessing_ColorMatrix_h
#define ImageProcessing_ColorMatrix_h
//ColorMatrix From Android
//lomo
const float colormatrix_lomo[] = {
1.7f, 0.1f, 0.1f, 0, -73.1f,
0, 1.7f, 0.1f, 0, -73.1f,
0, 0.1f, 1.6f, 0, -73.1f,
0, 0, 0, 1.0f, 0 };
//黑白
const float colormatrix_heibai[] = {
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0, 0, 0, 1.0f, 0 };
//旧化
const float colormatrix_huajiu[] = {
0.2f,0.5f, 0.1f, 0, 40.8f,
0.2f, 0.5f, 0.1f, 0, 40.8f,
0.2f,0.5f, 0.1f, 0, 40.8f,
0, 0, 0, 1, 0 };
//哥特
const float colormatrix_gete[] = {
1.9f,-0.3f, -0.2f, 0,-87.0f,
-0.2f, 1.7f, -0.1f, 0, -87.0f,
-0.1f,-0.6f, 2.0f, 0, -87.0f,
0, 0, 0, 1.0f, 0 };
//锐色
const float colormatrix_ruise[] = {
4.8f,-1.0f, -0.1f, 0,-388.4f,
-0.5f,4.4f, -0.1f, 0,-388.4f,
-0.5f,-1.0f, 5.2f, 0,-388.4f,
0, 0, 0, 1.0f, 0 };
//淡雅
const float colormatrix_danya[] = {
0.6f,0.3f, 0.1f, 0,73.3f,
0.2f,0.7f, 0.1f, 0,73.3f,
0.2f,0.3f, 0.4f, 0,73.3f,
0, 0, 0, 1.0f, 0 };
//酒红
const float colormatrix_jiuhong[] = {
1.2f,0.0f, 0.0f, 0.0f,0.0f,
0.0f,0.9f, 0.0f, 0.0f,0.0f,
0.0f,0.0f, 0.8f, 0.0f,0.0f,
0, 0, 0, 1.0f, 0 };
//清宁
const float colormatrix_qingning[] = {
0.9f, 0, 0, 0, 0,
0, 1.1f,0, 0, 0,
0, 0, 0.9f, 0, 0,
0, 0, 0, 1.0f, 0 };
//浪漫
const float colormatrix_langman[] = {
0.9f, 0, 0, 0, 63.0f,
0, 0.9f,0, 0, 63.0f,
0, 0, 0.9f, 0, 63.0f,
0, 0, 0, 1.0f, 0 };
//光晕
const float colormatrix_guangyun[] = {
0.9f, 0, 0, 0, 64.9f,
0, 0.9f,0, 0, 64.9f,
0, 0, 0.9f, 0, 64.9f,
0, 0, 0, 1.0f, 0 };
//蓝调
const float colormatrix_landiao[] = {
2.1f, -1.4f, 0.6f, 0.0f, -31.0f,
-0.3f, 2.0f, -0.3f, 0.0f, -31.0f,
-1.1f, -0.2f, 2.6f, 0.0f, -31.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//梦幻
const float colormatrix_menghuan[] = {
0.8f, 0.3f, 0.1f, 0.0f, 46.5f,
0.1f, 0.9f, 0.0f, 0.0f, 46.5f,
0.1f, 0.3f, 0.7f, 0.0f, 46.5f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//夜色
const float colormatrix_yese[] = {
1.0f, 0.0f, 0.0f, 0.0f, -66.6f,
0.0f, 1.1f, 0.0f, 0.0f, -66.6f,
0.0f, 0.0f, 1.0f, 0.0f, -66.6f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
#endif
#ifndef ImageProcessing_ColorMatrix_h
#define ImageProcessing_ColorMatrix_h
//ColorMatrix From Android
//lomo
const float colormatrix_lomo[] = {
1.7f, 0.1f, 0.1f, 0, -73.1f,
0, 1.7f, 0.1f, 0, -73.1f,
0, 0.1f, 1.6f, 0, -73.1f,
0, 0, 0, 1.0f, 0 };
//黑白
const float colormatrix_heibai[] = {
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0, 0, 0, 1.0f, 0 };
//旧化
const float colormatrix_huajiu[] = {
0.2f,0.5f, 0.1f, 0, 40.8f,
0.2f, 0.5f, 0.1f, 0, 40.8f,
0.2f,0.5f, 0.1f, 0, 40.8f,
0, 0, 0, 1, 0 };
//哥特
const float colormatrix_gete[] = {
1.9f,-0.3f, -0.2f, 0,-87.0f,
-0.2f, 1.7f, -0.1f, 0, -87.0f,
-0.1f,-0.6f, 2.0f, 0, -87.0f,
0, 0, 0, 1.0f, 0 };
//锐色
const float colormatrix_ruise[] = {
4.8f,-1.0f, -0.1f, 0,-388.4f,
-0.5f,4.4f, -0.1f, 0,-388.4f,
-0.5f,-1.0f, 5.2f, 0,-388.4f,
0, 0, 0, 1.0f, 0 };
//淡雅
const float colormatrix_danya[] = {
0.6f,0.3f, 0.1f, 0,73.3f,
0.2f,0.7f, 0.1f, 0,73.3f,
0.2f,0.3f, 0.4f, 0,73.3f,
0, 0, 0, 1.0f, 0 };
//酒红
const float colormatrix_jiuhong[] = {
1.2f,0.0f, 0.0f, 0.0f,0.0f,
0.0f,0.9f, 0.0f, 0.0f,0.0f,
0.0f,0.0f, 0.8f, 0.0f,0.0f,
0, 0, 0, 1.0f, 0 };
//清宁
const float colormatrix_qingning[] = {
0.9f, 0, 0, 0, 0,
0, 1.1f,0, 0, 0,
0, 0, 0.9f, 0, 0,
0, 0, 0, 1.0f, 0 };
//浪漫
const float colormatrix_langman[] = {
0.9f, 0, 0, 0, 63.0f,
0, 0.9f,0, 0, 63.0f,
0, 0, 0.9f, 0, 63.0f,
0, 0, 0, 1.0f, 0 };
//光晕
const float colormatrix_guangyun[] = {
0.9f, 0, 0, 0, 64.9f,
0, 0.9f,0, 0, 64.9f,
0, 0, 0.9f, 0, 64.9f,
0, 0, 0, 1.0f, 0 };
//蓝调
const float colormatrix_landiao[] = {
2.1f, -1.4f, 0.6f, 0.0f, -31.0f,
-0.3f, 2.0f, -0.3f, 0.0f, -31.0f,
-1.1f, -0.2f, 2.6f, 0.0f, -31.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//梦幻
const float colormatrix_menghuan[] = {
0.8f, 0.3f, 0.1f, 0.0f, 46.5f,
0.1f, 0.9f, 0.0f, 0.0f, 46.5f,
0.1f, 0.3f, 0.7f, 0.0f, 46.5f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//夜色
const float colormatrix_yese[] = {
1.0f, 0.0f, 0.0f, 0.0f, -66.6f,
0.0f, 1.1f, 0.0f, 0.0f, -66.6f,
0.0f, 0.0f, 1.0f, 0.0f, -66.6f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
#endif
#ifndef ImageProcessing_ColorMatrix_h
#define ImageProcessing_ColorMatrix_h
//ColorMatrix From Android
//lomo
const float colormatrix_lomo[] = {
1.7f, 0.1f, 0.1f, 0, -73.1f,
0, 1.7f, 0.1f, 0, -73.1f,
0, 0.1f, 1.6f, 0, -73.1f,
0, 0, 0, 1.0f, 0 };
//黑白
const float colormatrix_heibai[] = {
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0.8f, 1.6f, 0.2f, 0, -163.9f,
0, 0, 0, 1.0f, 0 };
//旧化
const float colormatrix_huajiu[] = {
0.2f,0.5f, 0.1f, 0, 40.8f,
0.2f, 0.5f, 0.1f, 0, 40.8f,
0.2f,0.5f, 0.1f, 0, 40.8f,
0, 0, 0, 1, 0 };
//哥特
const float colormatrix_gete[] = {
1.9f,-0.3f, -0.2f, 0,-87.0f,
-0.2f, 1.7f, -0.1f, 0, -87.0f,
-0.1f,-0.6f, 2.0f, 0, -87.0f,
0, 0, 0, 1.0f, 0 };
//锐色
const float colormatrix_ruise[] = {
4.8f,-1.0f, -0.1f, 0,-388.4f,
-0.5f,4.4f, -0.1f, 0,-388.4f,
-0.5f,-1.0f, 5.2f, 0,-388.4f,
0, 0, 0, 1.0f, 0 };
//淡雅
const float colormatrix_danya[] = {
0.6f,0.3f, 0.1f, 0,73.3f,
0.2f,0.7f, 0.1f, 0,73.3f,
0.2f,0.3f, 0.4f, 0,73.3f,
0, 0, 0, 1.0f, 0 };
//酒红
const float colormatrix_jiuhong[] = {
1.2f,0.0f, 0.0f, 0.0f,0.0f,
0.0f,0.9f, 0.0f, 0.0f,0.0f,
0.0f,0.0f, 0.8f, 0.0f,0.0f,
0, 0, 0, 1.0f, 0 };
//清宁
const float colormatrix_qingning[] = {
0.9f, 0, 0, 0, 0,
0, 1.1f,0, 0, 0,
0, 0, 0.9f, 0, 0,
0, 0, 0, 1.0f, 0 };
//浪漫
const float colormatrix_langman[] = {
0.9f, 0, 0, 0, 63.0f,
0, 0.9f,0, 0, 63.0f,
0, 0, 0.9f, 0, 63.0f,
0, 0, 0, 1.0f, 0 };
//光晕
const float colormatrix_guangyun[] = {
0.9f, 0, 0, 0, 64.9f,
0, 0.9f,0, 0, 64.9f,
0, 0, 0.9f, 0, 64.9f,
0, 0, 0, 1.0f, 0 };
//蓝调
const float colormatrix_landiao[] = {
2.1f, -1.4f, 0.6f, 0.0f, -31.0f,
-0.3f, 2.0f, -0.3f, 0.0f, -31.0f,
-1.1f, -0.2f, 2.6f, 0.0f, -31.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//梦幻
const float colormatrix_menghuan[] = {
0.8f, 0.3f, 0.1f, 0.0f, 46.5f,
0.1f, 0.9f, 0.0f, 0.0f, 46.5f,
0.1f, 0.3f, 0.7f, 0.0f, 46.5f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
//夜色
const float colormatrix_yese[] = {
1.0f, 0.0f, 0.0f, 0.0f, -66.6f,
0.0f, 1.1f, 0.0f, 0.0f, -66.6f,
0.0f, 0.0f, 1.0f, 0.0f, -66.6f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
#endif
----调用-----
outImage = [ImageUtil processImage:_tempImage withColorMatrix:colormatrix_landiao];
