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
  10         _width = CGImageGetWidth(ref), _height = CGImageGetHeight(ref);
  11         info = CGImageGetBitmapInfo(ref);
  12         alphaInfo = CGImageGetAlphaInfo(ref);
  13         colorSpace = CGImageGetColorSpace(ref);
  14
  15         dataRef = CGDataProviderCopyData(CGImageGetDataProvider(ref));
  16         CGImageRelease(ref);
  17
  18 }
  19
  20 unsigned char *Image::data() const {
  21         return (unsigned char*) CFDataGetBytePtr(dataRef);
  22 }
  23
  24 GLfloat Image::width() const { return _width; }
  25 GLfloat Image::height() const { return _height; }
  26
  27 // TODO: Properly implement this for both internal format + format
  28 GLuint Image::format() const {
  29         if (CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome) {
  30                 return GL_DEPTH_COMPONENT;
  31         }
  32         if (alphaInfo == kCGImageAlphaNone) {
  33                 return GL_RGB;
  34         }
  35         return GL_RGBA;
  36 }
  37
  38 Image::~Image() { CFRelease(dataRef); }