From Frida Schlaug, "Imageio for ios had a poorly implemented function for reading from streams (always returning null). In this patch I copied some code from the non-ios imageio file and adjusted it to work on ios. "
This commit is contained in:
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323ccafb0a
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@ -13,7 +13,123 @@
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#import <UIKit/UIImage.h>
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#import <CoreGraphics/CoreGraphics.h>
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#import <Foundation/Foundation.h>
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//#include "CoreGraphicsLoader.h"
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#import <ImageIO/CGImageSource.h>
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/**************************************************************
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***** Begin Callback functions for istream block reading *****
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**************************************************************/
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// This callback reads some bytes from an istream and copies it
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// to a Quartz buffer (supplied by Apple framework).
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size_t MyProviderGetBytesCallback(void* istream_userdata, void* quartz_buffer, size_t the_count)
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{
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std::istream* the_istream = (std::istream*)istream_userdata;
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the_istream->read((char*)quartz_buffer, the_count);
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return the_istream->gcount(); // return the actual number of bytes read
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}
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// This callback is triggered when the data provider is released
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// so you can clean up any resources.
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void MyProviderReleaseInfoCallback(void* istream_userdata)
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{
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// What should I put here? Do I need to close the istream?
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// The png and tga don't seem to.
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// std::istream* the_istream = (std::istream*)istream_userdata;
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}
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void MyProviderRewindCallback(void* istream_userdata)
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{
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std::istream* the_istream = (std::istream*)istream_userdata;
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the_istream->seekg(0, std::ios::beg);
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}
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off_t MyProviderSkipForwardBytesCallback(void* istream_userdata, off_t the_count)
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{
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std::istream* the_istream = (std::istream*)istream_userdata;
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off_t start_position = the_istream->tellg();
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the_istream->seekg(the_count, std::ios::cur);
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off_t end_position = the_istream->tellg();
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return (end_position - start_position);
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}
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/**************************************************************
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***** End Callback functions for istream block reading ********
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**************************************************************/
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/**************************************************************
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***** Begin Callback functions for ostream block writing ******
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**************************************************************/
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size_t MyConsumerPutBytesCallback(void* ostream_userdata, const void* quartz_buffer, size_t the_count)
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{
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std::ostream* the_ostream = (std::ostream*)ostream_userdata;
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the_ostream->write((char*)quartz_buffer, the_count);
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// Don't know how to get number of bytes actually written, so
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// just returning the_count.
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return the_count;
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}
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void MyConsumerReleaseInfoCallback(void* ostream_userdata)
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{
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std::ostream* the_ostream = (std::ostream*)ostream_userdata;
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the_ostream->flush();
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}
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/**************************************************************
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***** End Callback functions for ostream block writing ********
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**************************************************************/
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/**************************************************************
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***** Begin Support functions for reading (stream and file) ***
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**************************************************************/
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/* Create a CGImageSourceRef from raw data */
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CGImageRef CreateCGImageFromDataStream(std::istream& fin)
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{
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CGImageRef image_ref = NULL;
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CGImageSourceRef source_ref;
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/* The easy way would be to use CGImageSourceCreateWithData,
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* but this presumes you have a known fixed-length buffer of data.
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* The istream makes this harder to know, so we use the ProviderCallbacks APIs
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CFDataRef the_cf_data = CFDataCreateWithBytesNoCopy(
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kCFAllocatorDefault,
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(const UInt8*)the_data,
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CFIndex length,
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kCFAllocatorNull // do not free data buffer, must do it yourself
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);
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source_ref = CGImageSourceCreateWithData(the_cf_data, NULL);
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*/
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CGDataProviderSequentialCallbacks provider_callbacks =
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{
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0,
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MyProviderGetBytesCallback,
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MyProviderSkipForwardBytesCallback,
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MyProviderRewindCallback,
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MyProviderReleaseInfoCallback
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};
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CGDataProviderRef data_provider = CGDataProviderCreateSequential(&fin, &provider_callbacks);
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// If we had a way of hinting at what the data type is, we could
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// pass this hint in the second parameter.
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source_ref = CGImageSourceCreateWithDataProvider(data_provider, NULL);
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CGDataProviderRelease(data_provider);
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if(!source_ref)
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{
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return NULL;
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}
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image_ref = CGImageSourceCreateImageAtIndex(source_ref, 0, NULL);
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/* Don't need the SourceRef any more (error or not) */
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CFRelease(source_ref);
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return image_ref;
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}
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static NSString* toNSString(const std::string& text, NSStringEncoding nsse)
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{
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@ -40,7 +156,6 @@ static NSString* toNSString(const std::string& text)
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return toNSString(text, NSUTF8StringEncoding);
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}
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//
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//really basic image io for IOS
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//
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@ -62,6 +177,7 @@ osg::Image* ReadCoreGraphicsImageFromFile(std::string file)
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if (textureImage == nil) {
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NSLog(@"imageio: failed to load CGImageRef image '%@'", path );
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[pool release];
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return NULL;
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}
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@ -122,13 +238,88 @@ osg::Image* ReadCoreGraphicsImageFromFile(std::string file)
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pixels += 4;
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}
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[pool release];
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return image;
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}
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osg::Image* CreateOSGImageFromCGImage(CGImageRef textureImage)
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{
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NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
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if (textureImage == nil) {
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[pool release];
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NSLog(@"imageio: failed to load CGImageRef image");
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return NULL;
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}
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NSInteger texWidth = CGImageGetWidth(textureImage);
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NSInteger texHeight = CGImageGetHeight(textureImage);
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GLubyte *textureData = (GLubyte *)malloc(texWidth * texHeight * 4);
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CGContextRef textureContext = CGBitmapContextCreate(textureData,
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texWidth, texHeight,
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8, texWidth * 4,
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CGColorSpaceCreateDeviceRGB(),
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kCGImageAlphaPremultipliedLast);
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//copy into texturedata
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CGContextDrawImage(textureContext,
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CGRectMake(0.0, 0.0, (float)texWidth, (float)texHeight),
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textureImage);
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CGContextFlush(textureContext);
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CGContextRelease(textureContext);
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//create the osg image
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unsigned int dataType = GL_UNSIGNED_BYTE;
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int s = texWidth;
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int t = texHeight;
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osg::Image* image = new osg::Image();
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image->setImage(s, t, 1,
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GL_RGBA,
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GL_RGBA,
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GL_UNSIGNED_BYTE,
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textureData,
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osg::Image::USE_MALLOC_FREE);
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//flip vertical
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image->flipVertical();
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//
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// Reverse the premultiplied alpha for avoiding unexpected darker edges
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// by Tatsuhiro Nishioka (based on SDL's workaround on the similar issue)
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// http://bugzilla.libsdl.org/show_bug.cgi?id=868
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//
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int i, j;
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GLubyte *pixels = (GLubyte *)image->data();
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for (i = image->t() * image->s(); i--; ) {
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GLubyte alpha = pixels[3];
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if (alpha && (alpha < 255)) {
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for (j = 0; j < 3; ++j) {
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pixels[j] = (static_cast<int>(pixels[j]) * 255) / alpha;
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}
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}
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pixels += 4;
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}
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[pool release];
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return image;
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}
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class ReaderWriterImageIO : public osgDB::ReaderWriter
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@ -136,73 +327,73 @@ class ReaderWriterImageIO : public osgDB::ReaderWriter
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public:
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ReaderWriterImageIO()
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{
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supportsExtension("jpg", "jpg image file");
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supportsExtension("jpeg", "jpeg image file");
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supportsExtension("jpe", "jpe image file");
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supportsExtension("jp2", "jp2 image file");
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supportsExtension("tiff", "tiff image file");
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supportsExtension("tif", "tif image file");
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supportsExtension("gif", "gif image file");
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supportsExtension("png", "png image file");
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supportsExtension("pict", "pict image file");
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supportsExtension("pct", "pct image file");
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supportsExtension("pic", "pic image file");
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supportsExtension("bmp", "bmp image file");
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supportsExtension("BMPf", "BMPf image file");
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supportsExtension("ico", "ico image file");
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supportsExtension("icns", "icns image file");
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supportsExtension("tga", "tga image file");
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supportsExtension("targa", "targa image file");
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supportsExtension("psd", "psd image file");
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supportsExtension("pdf", "pdf image file");
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supportsExtension("eps", "eps image file");
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supportsExtension("epi", "epi image file");
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supportsExtension("epsf", "epsf image file");
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supportsExtension("epsi", "epsi image file");
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supportsExtension("ps", "postscript image file");
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supportsExtension("dng", "dng image file");
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supportsExtension("cr2", "cr2 image file");
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supportsExtension("crw", "crw image file");
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supportsExtension("fpx", "fpx image file");
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supportsExtension("fpxi", "fpxi image file");
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supportsExtension("raf", "raf image file");
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supportsExtension("dcr", "dcr image file");
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supportsExtension("ptng", "ptng image file");
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supportsExtension("pnt", "pnt image file");
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supportsExtension("mac", "mac image file");
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supportsExtension("mrw", "mrw image file");
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supportsExtension("nef", "nef image file");
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supportsExtension("orf", "orf image file");
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supportsExtension("exr", "exr image file");
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supportsExtension("qti", "qti image file");
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supportsExtension("qtif", "qtif image file");
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supportsExtension("hdr", "hdr image file");
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supportsExtension("sgi", "sgi image file");
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supportsExtension("srf", "srf image file");
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supportsExtension("cur", "cur image file");
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supportsExtension("xbm", "xbm image file");
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supportsExtension("raw", "raw image file");
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supportsExtension("jpg", "jpg image file");
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supportsExtension("jpeg", "jpeg image file");
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supportsExtension("jpe", "jpe image file");
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supportsExtension("jp2", "jp2 image file");
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supportsExtension("tiff", "tiff image file");
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supportsExtension("tif", "tif image file");
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supportsExtension("gif", "gif image file");
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supportsExtension("png", "png image file");
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supportsExtension("pict", "pict image file");
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supportsExtension("pct", "pct image file");
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supportsExtension("pic", "pic image file");
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supportsExtension("bmp", "bmp image file");
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supportsExtension("BMPf", "BMPf image file");
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supportsExtension("ico", "ico image file");
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supportsExtension("icns", "icns image file");
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supportsExtension("tga", "tga image file");
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supportsExtension("targa", "targa image file");
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supportsExtension("psd", "psd image file");
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supportsExtension("pdf", "pdf image file");
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supportsExtension("eps", "eps image file");
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supportsExtension("epi", "epi image file");
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supportsExtension("epsf", "epsf image file");
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supportsExtension("epsi", "epsi image file");
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supportsExtension("ps", "postscript image file");
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supportsExtension("dng", "dng image file");
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supportsExtension("cr2", "cr2 image file");
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supportsExtension("crw", "crw image file");
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supportsExtension("fpx", "fpx image file");
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supportsExtension("fpxi", "fpxi image file");
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supportsExtension("raf", "raf image file");
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supportsExtension("dcr", "dcr image file");
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supportsExtension("ptng", "ptng image file");
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supportsExtension("pnt", "pnt image file");
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supportsExtension("mac", "mac image file");
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supportsExtension("mrw", "mrw image file");
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supportsExtension("nef", "nef image file");
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supportsExtension("orf", "orf image file");
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supportsExtension("exr", "exr image file");
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supportsExtension("qti", "qti image file");
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supportsExtension("qtif", "qtif image file");
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supportsExtension("hdr", "hdr image file");
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supportsExtension("sgi", "sgi image file");
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supportsExtension("srf", "srf image file");
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supportsExtension("cur", "cur image file");
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supportsExtension("xbm", "xbm image file");
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supportsExtension("raw", "raw image file");
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}
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virtual const char* className() const { return "Mac OS X ImageIO based Image Reader/Writer"; }
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virtual bool acceptsExtension(const std::string& extension) const
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{
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// ImageIO speaks in UTIs.
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// http://developer.apple.com/graphicsimaging/workingwithimageio.html
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// The Cocoa drawing guide lists these and says to use the
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// imageFileTypes class method of NSImage to get a complete
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// list of extensions. But remember ImageIO may support more formats
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// than Cocoa.
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// http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Images/chapter_7_section_3.html
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// Apple's UTI guide:
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// http://developer.apple.com/documentation/Carbon/Conceptual/understanding_utis/utilist/chapter_4_section_1.html
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return
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virtual bool acceptsExtension(const std::string& extension) const
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{
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// ImageIO speaks in UTIs.
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// http://developer.apple.com/graphicsimaging/workingwithimageio.html
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// The Cocoa drawing guide lists these and says to use the
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// imageFileTypes class method of NSImage to get a complete
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// list of extensions. But remember ImageIO may support more formats
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// than Cocoa.
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// http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Images/chapter_7_section_3.html
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// Apple's UTI guide:
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// http://developer.apple.com/documentation/Carbon/Conceptual/understanding_utis/utilist/chapter_4_section_1.html
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return
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osgDB::equalCaseInsensitive(extension,"jpg") ||
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osgDB::equalCaseInsensitive(extension,"jpeg") ||
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osgDB::equalCaseInsensitive(extension,"jpe") ||
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osgDB::equalCaseInsensitive(extension,"tga") ||
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osgDB::equalCaseInsensitive(extension,"targa") ||
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osgDB::equalCaseInsensitive(extension,"psd") ||
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osgDB::equalCaseInsensitive(extension,"pdf") ||
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osgDB::equalCaseInsensitive(extension,"eps") ||
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osgDB::equalCaseInsensitive(extension,"epi") ||
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osgDB::equalCaseInsensitive(extension,"epsf") ||
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osgDB::equalCaseInsensitive(extension,"epsi") ||
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osgDB::equalCaseInsensitive(extension,"ps") ||
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osgDB::equalCaseInsensitive(extension,"dng") ||
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osgDB::equalCaseInsensitive(extension,"cr2") ||
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osgDB::equalCaseInsensitive(extension,"crw") ||
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@ -250,25 +441,25 @@ public:
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osgDB::equalCaseInsensitive(extension,"srf") ||
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osgDB::equalCaseInsensitive(extension,"cur") ||
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osgDB::equalCaseInsensitive(extension,"xbm") ||
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osgDB::equalCaseInsensitive(extension,"raw");
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}
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}
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ReadResult readImageStream(std::istream& fin) const
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{
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/*// Call ImageIO to load the image.
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// Call ImageIO to load the image.
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CGImageRef cg_image_ref = CreateCGImageFromDataStream(fin);
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if (NULL == cg_image_ref) return ReadResult::FILE_NOT_FOUND;
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*/
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// Create an osg::Image from the CGImageRef.
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osg::Image* osg_image = NULL; //CreateOSGImageFromCGImage(cg_image_ref);
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//CFRelease(cg_image_ref);
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osg::Image* osg_image = CreateOSGImageFromCGImage(cg_image_ref);
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CFRelease(cg_image_ref);
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return osg_image;
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}
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virtual ReadResult readImage(std::istream& fin, const osgDB::ReaderWriter::Options* the_options = NULL) const
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{
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ReadResult read_result = readImageStream(fin);
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@ -317,7 +508,7 @@ public:
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return WriteResult::FILE_SAVED;
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}
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virtual WriteResult writeImage(const osg::Image& osg_image, std::ostream& fout, const osgDB::ReaderWriter::Options* the_options) const
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{
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WriteResult write_result = writeImageStream(osg_image, fout, the_options);
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