image.cpp

   1 #include "image.hpp"
   2 #include <ImageIO/ImageIO.h>
   3
   4 Image::Image(const std::string &path) {
   5         CFStringRef str = CFStringCreateWithCString(NULL, path.c_str(), kCFStringEncodingUTF8);
   6         CFURLRef url = CFURLCreateWithFileSystemPath(NULL, str, kCFURLPOSIXPathStyle, false);
   7         CGImageSourceRef source = CGImageSourceCreateWithURL(url, NULL);
   8         CGImageRef ref = CGImageSourceCreateImageAtIndex(source, 0, NULL);
   9         /* auto provider = CGDataProviderCreateWithFilename(path.c_str()); */
  10         /* std::ifstream file(path); */
  11         /* long magic; */
  12         /* file.read((char*)&magic, 8); */
  13         /* file.close(); */
  14
  15         /* CGImageRef ref; */
  16
  17         /* if (magic == 0x0a1a0a0d474e5089) // png magic number */
  18         /*      ref = CGImageCreateWithPNGDataProvider(provider, nullptr, false, kCGRenderingIntentDefault); */
  19         /* else */
  20         /*      ref = CGImageCreateWithJPEGDataProvider(provider, nullptr, false, kCGRenderingIntentDefault); */
  21
  22         _width = CGImageGetWidth(ref), _height = CGImageGetHeight(ref);
  23         info = CGImageGetBitmapInfo(ref);
  24         alphaInfo = CGImageGetAlphaInfo(ref);
  25         colorSpace = CGImageGetColorSpace(ref);
  26
  27         dataRef = CGDataProviderCopyData(CGImageGetDataProvider(ref));
  28         CGImageRelease(ref);
  29
  30 }
  31
  32 unsigned char *Image::data() const {
  33         return (unsigned char*) CFDataGetBytePtr(dataRef);
  34 }
  35
  36 GLfloat Image::width() const { return _width; }
  37 GLfloat Image::height() const { return _height; }
  38
  39 GLuint Image::format() const {
  40         if (CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome) {
  41                 return GL_DEPTH_COMPONENT;
  42         }
  43         if (alphaInfo == kCGImageAlphaNone) {
  44                 return GL_RGB;
  45         }
  46         return GL_RGBA;
  47 }
  48
  49 Image::~Image() { CFRelease(dataRef); }