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https://github.com/opencv/opencv.git
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397 lines
9.8 KiB
C++
397 lines
9.8 KiB
C++
/*
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* grfmt_imageio.cpp
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*
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*
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* Created by Morgan Conbere on 5/17/07.
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*
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*/
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#include "precomp.hpp"
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#ifdef HAVE_IMAGEIO
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#include "grfmt_imageio.hpp"
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namespace cv
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{
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/////////////////////// ImageIODecoder ///////////////////
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ImageIODecoder::ImageIODecoder()
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{
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imageRef = NULL;
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}
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ImageIODecoder::~ImageIODecoder()
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{
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close();
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}
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void ImageIODecoder::close()
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{
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CGImageRelease( imageRef );
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imageRef = NULL;
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}
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size_t ImageIODecoder::signatureLength() const
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{
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return 12;
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}
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bool ImageIODecoder::checkSignature( const string& signature ) const
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{
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// TODO: implement real signature check
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return true;
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}
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ImageDecoder ImageIODecoder::newDecoder() const
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{
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return new ImageIODecoder;
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}
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bool ImageIODecoder::readHeader()
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{
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CFURLRef imageURLRef;
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CGImageSourceRef sourceRef;
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// diciu, if ReadHeader is called twice in a row make sure to release the previously allocated imageRef
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if (imageRef != NULL)
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CGImageRelease(imageRef);
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imageRef = NULL;
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imageURLRef = CFURLCreateFromFileSystemRepresentation( NULL,
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(const UInt8*)m_filename.c_str(), m_filename.size(), false );
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sourceRef = CGImageSourceCreateWithURL( imageURLRef, NULL );
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CFRelease( imageURLRef );
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if ( !sourceRef )
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return false;
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imageRef = CGImageSourceCreateImageAtIndex( sourceRef, 0, NULL );
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CFRelease( sourceRef );
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if( !imageRef )
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return false;
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m_width = CGImageGetWidth( imageRef );
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m_height = CGImageGetHeight( imageRef );
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CGColorSpaceRef colorSpace = CGImageGetColorSpace( imageRef );
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if( !colorSpace )
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return false;
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m_type = CGColorSpaceGetNumberOfComponents( colorSpace ) > 1 ? CV_8UC3 : CV_8UC1;
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return true;
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}
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bool ImageIODecoder::readData( Mat& img )
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{
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uchar* data = img.data;
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int step = img.step;
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bool color = img.channels() > 1;
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int bpp; // Bytes per pixel
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int bit_depth = 8;
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// Get Height, Width, and color information
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if( !readHeader() )
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return false;
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CGContextRef context = NULL; // The bitmap context
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CGColorSpaceRef colorSpace = NULL;
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uchar* bitmap = NULL;
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CGImageAlphaInfo alphaInfo;
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// CoreGraphics will take care of converting to grayscale and back as long as the
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// appropriate colorspace is set
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if( color == CV_LOAD_IMAGE_GRAYSCALE )
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{
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colorSpace = CGColorSpaceCreateDeviceGray();
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bpp = 1;
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alphaInfo = kCGImageAlphaNone;
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}
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else if( color == CV_LOAD_IMAGE_COLOR )
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{
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#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
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colorSpace = CGColorSpaceCreateDeviceRGB();
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#else
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colorSpace = CGColorSpaceCreateWithName( kCGColorSpaceGenericRGBLinear );
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#endif
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bpp = 4; /* CG only has 8 and 32 bit color spaces, so we waste a byte */
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alphaInfo = kCGImageAlphaNoneSkipLast;
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}
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if( !colorSpace )
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return false;
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bitmap = (uchar*)malloc( bpp * m_height * m_width );
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if( !bitmap )
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{
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CGColorSpaceRelease( colorSpace );
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return false;
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}
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context = CGBitmapContextCreate( (void *)bitmap,
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m_width, /* width */
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m_height, /* height */
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bit_depth, /* bit depth */
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bpp * m_width, /* bytes per row */
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colorSpace, /* color space */
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alphaInfo);
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CGColorSpaceRelease( colorSpace );
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if( !context )
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{
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free( bitmap );
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return false;
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}
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// Copy the image data into the bitmap region
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CGRect rect = {{0,0},{m_width,m_height}};
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CGContextDrawImage( context, rect, imageRef );
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uchar* bitdata = (uchar*)CGBitmapContextGetData( context );
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if( !bitdata )
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{
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free( bitmap);
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CGContextRelease( context );
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return false;
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}
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// Move the bitmap (in RGB) into data (in BGR)
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int bitmapIndex = 0;
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if( color == CV_LOAD_IMAGE_COLOR )
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{
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uchar * base = data;
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for (int y = 0; y < m_height; y++)
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{
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uchar * line = base + y * step;
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for (int x = 0; x < m_width; x++)
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{
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// Blue channel
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line[0] = bitdata[bitmapIndex + 2];
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// Green channel
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line[1] = bitdata[bitmapIndex + 1];
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// Red channel
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line[2] = bitdata[bitmapIndex + 0];
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line += 3;
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bitmapIndex += bpp;
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}
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}
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}
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else if( color == CV_LOAD_IMAGE_GRAYSCALE )
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{
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for (int y = 0; y < m_height; y++)
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memcpy (data + y * step, bitmap + y * m_width, m_width);
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}
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free( bitmap );
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CGContextRelease( context );
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return true;
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}
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/////////////////////// ImageIOEncoder ///////////////////
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ImageIOEncoder::ImageIOEncoder()
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{
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m_description = "Apple ImageIO (*.bmp;*.dib;*.exr;*.jpeg;*.jpg;*.jpe;*.jp2;*.pdf;*.png;*.tiff;*.tif)";
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}
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ImageIOEncoder::~ImageIOEncoder()
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{
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}
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ImageEncoder ImageIOEncoder::newEncoder() const
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{
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return new ImageIOEncoder;
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}
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static
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CFStringRef FilenameToUTI( const char* filename )
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{
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const char* ext = filename;
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char* ext_buf;
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int i;
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CFStringRef imageUTI = NULL;
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for(;;)
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{
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const char* temp = strchr( ext + 1, '.' );
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if( !temp ) break;
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ext = temp;
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}
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if(!ext)
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return NULL;
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ext_buf = (char*)malloc(strlen(ext)+1);
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for(i = 0; ext[i] != '\0'; i++)
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ext_buf[i] = (char)tolower(ext[i]);
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ext_buf[i] = '\0';
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ext = ext_buf;
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if( !strcmp(ext, ".bmp") || !strcmp(ext, ".dib") )
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imageUTI = CFSTR( "com.microsoft.bmp" );
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else if( !strcmp(ext, ".exr") )
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imageUTI = CFSTR( "com.ilm.openexr-image" );
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else if( !strcmp(ext, ".jpeg") || !strcmp(ext, ".jpg") || !strcmp(ext, ".jpe") )
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imageUTI = CFSTR( "public.jpeg" );
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else if( !strcmp(ext, ".jp2") )
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imageUTI = CFSTR( "public.jpeg-2000" );
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else if( !strcmp(ext, ".pdf") )
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imageUTI = CFSTR( "com.adobe.pdf" );
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else if( !strcmp(ext, ".png") )
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imageUTI = CFSTR( "public.png" );
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else if( !strcmp(ext, ".tiff") || !strcmp(ext, ".tif") )
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imageUTI = CFSTR( "public.tiff" );
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free(ext_buf);
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return imageUTI;
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}
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bool ImageIOEncoder::write( const Mat& img, const vector<int>& params )
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{
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int width = img.cols, height = img.rows;
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int _channels = img.channels();
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const uchar* data = img.data;
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int step = img.step;
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// Determine the appropriate UTI based on the filename extension
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CFStringRef imageUTI = FilenameToUTI( m_filename.c_str() );
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// Determine the Bytes Per Pixel
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int bpp = (_channels == 1) ? 1 : 4;
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// Write the data into a bitmap context
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CGContextRef context;
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CGColorSpaceRef colorSpace;
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uchar* bitmapData = NULL;
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if( bpp == 1 ) {
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#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
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colorSpace = CGColorSpaceCreateDeviceGray();
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#else
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colorSpace = CGColorSpaceCreateWithName( kCGColorSpaceGenericGray );
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#endif
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}
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else if( bpp == 4 ) {
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#if TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
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colorSpace = CGColorSpaceCreateDeviceRGB();
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#else
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colorSpace = CGColorSpaceCreateWithName( kCGColorSpaceGenericRGBLinear );
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#endif
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}
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if( !colorSpace )
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return false;
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bitmapData = (uchar*)malloc( bpp * height * width );
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if( !bitmapData )
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{
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CGColorSpaceRelease( colorSpace );
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return false;
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}
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context = CGBitmapContextCreate( bitmapData,
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width,
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height,
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8,
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bpp * width,
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colorSpace,
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(bpp == 1) ? kCGImageAlphaNone :
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kCGImageAlphaNoneSkipLast );
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CGColorSpaceRelease( colorSpace );
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if( !context )
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{
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free( bitmapData );
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return false;
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}
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// Copy pixel information from data into bitmapData
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if (bpp == 4)
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{
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int bitmapIndex = 0;
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const uchar * base = data;
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for (int y = 0; y < height; y++)
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{
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const uchar * line = base + y * step;
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for (int x = 0; x < width; x++)
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{
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// Blue channel
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bitmapData[bitmapIndex + 2] = line[0];
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// Green channel
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bitmapData[bitmapIndex + 1] = line[1];
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// Red channel
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bitmapData[bitmapIndex + 0] = line[2];
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line += 3;
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bitmapIndex += bpp;
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}
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}
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}
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else if (bpp == 1)
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{
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for (int y = 0; y < height; y++)
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memcpy (bitmapData + y * width, data + y * step, width);
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}
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// Turn the bitmap context into an imageRef
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CGImageRef imageRef = CGBitmapContextCreateImage( context );
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CGContextRelease( context );
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if( !imageRef )
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{
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free( bitmapData );
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return false;
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}
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// Write the imageRef to a file based on the UTI
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CFURLRef imageURLRef = CFURLCreateFromFileSystemRepresentation( NULL,
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(const UInt8*)m_filename.c_str(), m_filename.size(), false );
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if( !imageURLRef )
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{
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CGImageRelease( imageRef );
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free( bitmapData );
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return false;
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}
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CGImageDestinationRef destRef = CGImageDestinationCreateWithURL( imageURLRef,
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imageUTI,
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1,
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NULL);
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CFRelease( imageURLRef );
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if( !destRef )
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{
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CGImageRelease( imageRef );
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free( bitmapData );
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fprintf(stderr, "!destRef\n");
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return false;
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}
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CGImageDestinationAddImage(destRef, imageRef, NULL);
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if( !CGImageDestinationFinalize(destRef) )
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{
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fprintf(stderr, "Finalize failed\n");
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return false;
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}
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CFRelease( destRef );
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CGImageRelease( imageRef );
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free( bitmapData );
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return true;
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}
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}
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#endif /* HAVE_IMAGEIO */
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