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ImfPreviewImage.h
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34 
35 
36 #ifndef INCLUDED_IMF_PREVIEW_IMAGE_H
37 #define INCLUDED_IMF_PREVIEW_IMAGE_H
38 
39 #include "ImfNamespace.h"
40 #include "ImfExport.h"
41 
42 //-----------------------------------------------------------------------------
43 //
44 // class PreviewImage -- a usually small, low-dynamic range image,
45 // that is intended to be stored in an image file's header.
46 //
47 // struct PreviewRgba -- holds the value of a PreviewImage pixel.
48 //
49 //-----------------------------------------------------------------------------
50 
51 
53 
54 
56 {
57  unsigned char r; // Red, green and blue components of
58  unsigned char g; // the pixel's color; intensity is
59  unsigned char b; // proportional to pow (x/255, 2.2),
60  // where x is r, g, or b.
61 
62  unsigned char a; // The pixel's alpha; 0 == transparent,
63  // 255 == opaque.
64 
65  PreviewRgba (unsigned char r = 0,
66  unsigned char g = 0,
67  unsigned char b = 0,
68  unsigned char a = 255)
69  : r(r), g(g), b(b), a(a) {}
70 };
71 
72 
74 {
75  public:
76 
77  //--------------------------------------------------------------------
78  // Constructor:
79  //
80  // PreviewImage(w,h,p) constructs a preview image with w by h pixels
81  // whose initial values are specified in pixel array p. The x and y
82  // coordinates of the pixels in p go from 0 to w-1, and from 0 to h-1.
83  // The pixel with coordinates (x, y) is at address p + y*w + x.
84  // Pixel (0, 0) is in the upper left corner of the preview image.
85  // If p is zero, the pixels in the preview image are initialized with
86  // (r = 0, b = 0, g = 0, a = 255).
87  //
88  //--------------------------------------------------------------------
89 
90  PreviewImage (unsigned int width = 0,
91  unsigned int height = 0,
92  const PreviewRgba pixels[] = 0);
93 
94  //-----------------------------------------------------
95  // Copy constructor, destructor and assignment operator
96  //-----------------------------------------------------
97 
98  PreviewImage (const PreviewImage &other);
99  ~PreviewImage ();
100 
101  PreviewImage & operator = (const PreviewImage &other);
102 
103 
104  //-----------------------------------------------
105  // Access to width, height and to the pixel array
106  //-----------------------------------------------
107 
108  unsigned int width () const {return _width;}
109  unsigned int height () const {return _height;}
110 
111  PreviewRgba * pixels () {return _pixels;}
112  const PreviewRgba * pixels () const {return _pixels;}
113 
114 
115  //----------------------------
116  // Access to individual pixels
117  //----------------------------
118 
119  PreviewRgba & pixel (unsigned int x, unsigned int y)
120  {return _pixels[y * _width + x];}
121 
122  const PreviewRgba & pixel (unsigned int x, unsigned int y) const
123  {return _pixels[y * _width + x];}
124 
125  private:
126 
127  unsigned int _width;
128  unsigned int _height;
129  PreviewRgba * _pixels;
130 };
131 
132 
134 
135 #endif
#define OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
Definition: ImfNamespace.h:109
unsigned int width() const
const PreviewRgba * pixels() const
GLboolean GLboolean g
Definition: glcorearb.h:1221
GLboolean GLboolean GLboolean GLboolean a
Definition: glcorearb.h:1221
GLint GLint GLsizei GLint GLenum GLenum const void * pixels
Definition: glcorearb.h:107
GLint y
Definition: glcorearb.h:102
unsigned char r
unsigned int height() const
GLint GLsizei width
Definition: glcorearb.h:102
const PreviewRgba & pixel(unsigned int x, unsigned int y) const
PreviewRgba * pixels()
unsigned char a
#define IMF_EXPORT
Definition: ImfExport.h:59
GLboolean GLboolean GLboolean b
Definition: glcorearb.h:1221
unsigned char b
GLint GLsizei GLsizei height
Definition: glcorearb.h:102
GLint GLenum GLint x
Definition: glcorearb.h:408
PreviewRgba & pixel(unsigned int x, unsigned int y)
#define OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
Definition: ImfNamespace.h:108
GLboolean r
Definition: glcorearb.h:1221
PreviewRgba(unsigned char r=0, unsigned char g=0, unsigned char b=0, unsigned char a=255)
unsigned char g