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         bitsPerComponent = CGImageGetBitsPerComponent(ref);
  15
  16         dataRef = CGDataProviderCopyData(CGImageGetDataProvider(ref));
  17         CGImageRelease(ref);
  18
  19 }
  20
  21 unsigned char *Image::data() const {
  22         return (unsigned char*) CFDataGetBytePtr(dataRef);
  23 }
  24
  25 GLfloat Image::width() const { return _width; }
  26 GLfloat Image::height() const { return _height; }
  27
  28 // TODO: Properly implement this for both internal format + format
  29 GLenum Image::format() const {
  30         if (CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome) {
  31                 return GL_DEPTH_COMPONENT;
  32         }
  33         if (alphaInfo == kCGImageAlphaNone) {
  34                 return GL_RGB;
  35         }
  36         return GL_RGBA;
  37 }
  38
  39 GLint Image::internalFormat() const {
  40         switch (format()) {
  41                 case GL_DEPTH_COMPONENT: return GL_DEPTH_COMPONENT;
  42                 case GL_RGB: return GL_RGB;
  43                 default: return GL_RGBA;
  44         }
  45 }
  46
  47 GLenum Image::type() const {
  48         bool isFloat = info & kCGBitmapFloatComponents;
  49         if (isFloat) return GL_FLOAT;
  50         return GL_UNSIGNED_BYTE;
  51
  52         //TODO:
  53         /* switch (bitsPerComponent) { */
  54         /*      case 1: return GL_UNSIGNED_BYTE; */
  55         /*      case 16: return GL_UNSIGNED_SHORT; */
  56         /*  case 24: */
  57 }
  58
  59 Image::~Image() { CFRelease(dataRef); }