// image.h -- Thatcher Ulrich 2002 // This source code has been donated to the Public Domain. Do // whatever you want with it. // Handy image utilities for RGB surfaces. #ifndef IMAGE_H #define IMAGE_H #include "base/tu_config.h" #include "base/tu_types.h" class tu_file; namespace jpeg { struct input; }; namespace image { struct image_base { Uint8* m_data; int m_width; int m_height; int m_pitch; // byte offset from one row to the next image_base(Uint8* data, int width, int height, int pitch); }; // 24-bit RGB image. Packed data, red byte first (RGBRGB...) struct rgb : public image_base { rgb(int width, int height); ~rgb(); }; // 32-bit RGBA image. Packed data, red byte first (RGBARGBA...) struct rgba : public image_base { rgba(int width, int height); ~rgba(); void set_pixel(int x, int y, Uint8 r, Uint8 g, Uint8 b, Uint8 a); }; // 8-bit alpha image. struct alpha : public image_base { alpha(int width, int height); ~alpha(); void set_pixel(int x, int y, Uint8 a); // Bitwise content comparison. bool operator==(const alpha& a) const; // Return a hash code based on the image contents. unsigned int compute_hash() const; }; // Make a system-memory 24-bit bitmap surface. 24-bit packed // data, red byte first. rgb* create_rgb(int width, int height); // Make a system-memory 32-bit bitmap surface. Packed data, // red byte first. rgba* create_rgba(int width, int height); // Make a system-memory 8-bit bitmap surface. alpha* create_alpha(int width, int height); Uint8* scanline(image_base* surf, int y); const Uint8* scanline(const image_base* surf, int y); void resample(rgb* out, int out_x0, int out_y0, int out_x1, int out_y1, rgb* in, float in_x0, float in_y0, float in_x1, float in_y1); void resample(rgba* out, int out_x0, int out_y0, int out_x1, int out_y1, rgba* in, float in_x0, float in_y0, float in_x1, float in_y1); void write_jpeg(tu_file* out, rgb* image, int quality); void write_tga(tu_file* out, rgba* image); rgb* read_jpeg(const char* filename); rgb* read_jpeg(tu_file* in); // For reading SWF JPEG2-style image data (slight variation on // ordinary JPEG). rgb* read_swf_jpeg2(tu_file* in); // For reading SWF JPEG2-style image data, using pre-loaded // headers stored in the given jpeg::input object. rgb* read_swf_jpeg2_with_tables(jpeg::input* loader); // For reading SWF JPEG3-style image data, like ordinary JPEG, // but stores the data in rgba format. rgba* read_swf_jpeg3(tu_file* in); // Fast, in-place, DESTRUCTIVE resample. For making mip-maps. // Munges the input image to produce the output image. void make_next_miplevel(rgb* image); void make_next_miplevel(rgba* image); }; #endif // IMAGE_H // Local Variables: // mode: C++ // c-basic-offset: 8 // tab-width: 8 // indent-tabs-mode: t // End:
