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         initWithImageRef(ref);
  10         CGImageRelease(ref);
  11 }
  12
  13 Image::Image(const unsigned char *data, size_t length) {
  14         CGDataProviderRef dpRef = CGDataProviderCreateWithData(NULL, data, length, NULL);
  15         CGImageRef ref = CGImageCreateWithJPEGDataProvider(dpRef, NULL, false, kCGRenderingIntentDefault);
  16         initWithImageRef(ref);
  17         CGImageRelease(ref);
  18 }
  19
  20 void Image::initWithImageRef(CGImageRef ref) {
  21         _width = CGImageGetWidth(ref), _height = CGImageGetHeight(ref);
  22         info = CGImageGetBitmapInfo(ref);
  23         alphaInfo = CGImageGetAlphaInfo(ref);
  24         colorSpace = CGImageGetColorSpace(ref);
  25         bitsPerComponent = CGImageGetBitsPerComponent(ref);
  26
  27         dataRef = CGDataProviderCopyData(CGImageGetDataProvider(ref));
  28 }
  29
  30 unsigned char *Image::data() const {
  31         return (unsigned char*) CFDataGetBytePtr(dataRef);
  32 }
  33
  34 GLfloat Image::width() const { return _width; }
  35 GLfloat Image::height() const { return _height; }
  36
  37 // TODO: Properly implement this for both internal format + format
  38 GLenum Image::format() const {
  39         if (CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome) {
  40                 return GL_DEPTH_COMPONENT;
  41         }
  42         if (alphaInfo == kCGImageAlphaNone) {
  43                 return GL_RGB;
  44         }
  45         return GL_RGBA;
  46 }
  47
  48 GLint Image::internalFormat() const {
  49         switch (format()) {
  50                 case GL_DEPTH_COMPONENT: return GL_DEPTH_COMPONENT;
  51                 case GL_RGB: return GL_RGB;
  52                 default: return GL_RGBA;
  53         }
  54 }
  55
  56 GLenum Image::type() const {
  57         bool isFloat = info & kCGBitmapFloatComponents;
  58         if (isFloat) return GL_FLOAT;
  59         return GL_UNSIGNED_BYTE;
  60
  61         //TODO:
  62         /* switch (bitsPerComponent) { */
  63         /*      case 1: return GL_UNSIGNED_BYTE; */
  64         /*      case 16: return GL_UNSIGNED_SHORT; */
  65         /*  case 24: */
  66 }
  67
  68 Image::~Image() { CFRelease(dataRef); }