He intentado el desenfoque gaussiano y he comprobado todas las preguntas en Stackoverflow, pero ninguna de ellas resolvió el problema. Por favor, ayúdenme si hay alguna otra forma de desenfocar imágenes que no sean el algoritmo de desenfoque gaussiano. El tamaño de mi imagen es de 768x1024 y los bucles se repiten durante 2 * 1024 * 768 veces y esto no es posible.Desenfocar un UIImage en el cambio del control deslizante
CGContextRef NYXImageCreateARGBBitmapContext(const size_t width, const size_t height, const size_t bytesPerRow)
{
/// Use the generic RGB color space
/// We avoid the NULL check because CGColorSpaceRelease() NULL check the value anyway, and worst case scenario = fail to create context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
/// Create the bitmap context, we want pre-multiplied ARGB, 8-bits per component
CGContextRef bmContext = CGBitmapContextCreate(NULL, width, height, 8/*Bits per component*/, bytesPerRow, colorSpace, kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease(colorSpace);
return bmContext;
}
-(UIImage*)blurredImageUsingGaussFactor:(NSUInteger)gaussFactor andPixelRadius:(NSUInteger)pixelRadius
{
CGImageRef cgImage = self.CGImage;
const size_t originalWidth = CGImageGetWidth(cgImage);
const size_t originalHeight = CGImageGetHeight(cgImage);
const size_t bytesPerRow = originalWidth * 4;
CGContextRef context = NYXImageCreateARGBBitmapContext(originalWidth, originalHeight, bytesPerRow);
if (!context)
return nil;
unsigned char *srcData, *destData, *finalData;
size_t width = CGBitmapContextGetWidth(context);
size_t height = CGBitmapContextGetHeight(context);
size_t bpr = CGBitmapContextGetBytesPerRow(context);
size_t bpp = CGBitmapContextGetBitsPerPixel(context)/8;
CGRect rect = {{0.0f, 0.0f}, {width, height}};
CGContextDrawImage(context, rect, cgImage);
// Now we can get a pointer to the image data associated with the bitmap
// context.
srcData = (unsigned char*)CGBitmapContextGetData(context);
if (srcData != NULL)
{
size_t dataSize = bpr * height;
finalData = malloc(dataSize);
destData = malloc(dataSize);
memcpy(finalData, srcData, dataSize);
memcpy(destData, srcData, dataSize);
int sums[gaussFactor];
size_t i, /*x, y,*/ k;
int gauss_sum = 0;
size_t radius = pixelRadius * 2 + 1;
int *gauss_fact = malloc(radius * sizeof(int));
for (i = 0; i < pixelRadius; i++)
{
gauss_fact[i] = 1 + (gaussFactor * i);
gauss_fact[radius - (i + 1)] = 1 + (gaussFactor * i);
gauss_sum += (gauss_fact[i] + gauss_fact[radius - (i + 1)]);
}
gauss_fact[(radius - 1)/2] = 1 + (gaussFactor*pixelRadius);
gauss_sum += gauss_fact[(radius - 1)/2];
unsigned char *p1, *p2, *p3;
for (size_t y = 0; y < height; y++)
{
for (size_t x = 0; x < width; x++)
{
p1 = srcData + bpp * (y * width + x);
p2 = destData + bpp * (y * width + x);
for (i = 0; i < gaussFactor; i++)
sums[i] = 0;
for (k = 0; k < radius ; k++)
{
if ((y - ((radius - 1) >> 1) + k) < height)
p1 = srcData + bpp * ((y - ((radius - 1) >> 1) + k) * width + x);
else
p1 = srcData + bpp * (y * width + x);
for (i = 0; i < bpp; i++)
sums[i] += p1[i] * gauss_fact[k];
}
for (i = 0; i < bpp; i++)
p2[i] = sums[i]/gauss_sum;
}
}
for (size_t y = 0; y < height; y++)
{
for (size_t x = 0; x < width; x++)
{
p2 = destData + bpp * (y * width + x);
p3 = finalData + bpp * (y * width + x);
for (i = 0; i < gaussFactor; i++)
sums[i] = 0;
for(k = 0; k < radius ; k++)
{
if ((x - ((radius - 1) >> 1) + k) < width)
p1 = srcData + bpp * (y * width + (x - ((radius - 1) >> 1) + k));
else
p1 = srcData + bpp * (y * width + x);
for (i = 0; i < bpp; i++)
sums[i] += p2[i] * gauss_fact[k];
}
for (i = 0; i < bpp; i++)
{
p3[i] = sums[i]/gauss_sum;
}
}
}
}
size_t bitmapByteCount = bpr * height;
///////Here was the problem.. you had given srcData instead of destData.. Rest all
//were perfect...
CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, destData, bitmapByteCount, NULL);
CGImageRef blurredImageRef = CGImageCreate(width, height, CGBitmapContextGetBitsPerComponent(context), CGBitmapContextGetBitsPerPixel(context), CGBitmapContextGetBytesPerRow(context), CGBitmapContextGetColorSpace(context), CGBitmapContextGetBitmapInfo(context), dataProvider, NULL, true, kCGRenderingIntentDefault);
CGDataProviderRelease(dataProvider);
CGContextRelease(context);
if (destData)
free(destData);
if (finalData)
free(finalData);
UIImage* retUIImage = [UIImage imageWithCGImage:blurredImageRef];
CGImageRelease(blurredImageRef);
return retUIImage;
}
enviar el código para su aplicación gaussiano - de esa manera puedes obtener ayuda para solucionarlo –
ok, solo publico mi código. – Leena
Marque esta cuestión de forma: http://stackoverflow.com/questions/1356250/iphone-blur-uiimage –