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105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/*
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RGBAImage.h
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Copyright (C) 2006 Yangli Hector Yee
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This program is free software; you can redistribute it and/or modify it under the terms of the
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GNU General Public License as published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with this program;
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if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _RGBAIMAGE_H
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#define _RGBAIMAGE_H
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#include<string>
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#include<cairo.h>
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/* assumes data is in the ABGR format */
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class RGBAImage
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{
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public:
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RGBAImage() { Width = 0; Height = 0; Data = 0; }
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RGBAImage(int w, int h, const char *name = 0)
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{
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Width = w;
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Height = h;
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if (name) Name = name;
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Data = new unsigned int[w * h];
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};
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~RGBAImage() { if (Data) delete[] Data; }
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virtual unsigned char Get_Red(unsigned int i) { return (Data[i] & 0xFF); }
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virtual unsigned char Get_Green(unsigned int i) { return ((Data[i]>>8) & 0xFF); }
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virtual unsigned char Get_Blue(unsigned int i) { return ((Data[i]>>16) & 0xFF); }
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virtual unsigned char Get_Alpha(unsigned int i) { return ((Data[i]>>24) & 0xFF); }
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virtual void Set(unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned int i)
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{ Data[i] = r | (g << 8) | (b << 16) | (a << 24); }
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int Get_Width(void) const { return Width; }
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int Get_Height(void) const { return Height; }
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virtual void Set(int x, int y, unsigned int d) { Data[x + y * Width] = d; }
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virtual unsigned int Get(int x, int y) const { return Data[x + y * Width]; }
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virtual unsigned int Get(int i) const { return Data[i]; }
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const std::string &Get_Name(void) const { return Name; }
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bool WritePPM();
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static RGBAImage* ReadTiff(char *filename);
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static RGBAImage* ReadPNG(char *filename);
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protected:
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int Width;
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int Height;
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std::string Name;
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unsigned int *Data;
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};
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class RGBACairoImage : public RGBAImage
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{
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public:
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RGBACairoImage (cairo_surface_t *surface)
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{
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Width = cairo_image_surface_get_width (surface);
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Height = cairo_image_surface_get_height (surface);
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Data = (unsigned int *) cairo_image_surface_get_data (surface);
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if (cairo_image_surface_get_stride (surface) != 4 * Width) {
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fprintf (stderr, "Error: Currently only support images where stride == 4 * width\n");
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exit (1);
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}
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}
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~RGBACairoImage() { }
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unsigned int ARGB_to_ABGR(unsigned int pixel) const {
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unsigned int new_pixel;
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new_pixel = pixel & 0xff00ff00;
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new_pixel |= (pixel & 0x00ff0000) >> 16;
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new_pixel |= (pixel & 0x000000ff) << 16;
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return new_pixel;
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}
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unsigned int Get_Unpremultiply(unsigned int i) const {
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uint32_t pixel;
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uint8_t alpha;
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pixel = Data[i];
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alpha = (pixel & 0xff000000) >> 24;
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if (alpha == 0)
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return 0;
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return (alpha << 24) |
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((((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha) << 16 |
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((((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha) << 8 |
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((((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha) << 0;
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}
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unsigned char Get_Alpha(unsigned int i) { return (Get_Unpremultiply(i) & 0xff000000) >> 24;}
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unsigned char Get_Red(unsigned int i) { return (Get_Unpremultiply(i) & 0x00ff0000) >> 16;}
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unsigned char Get_Green(unsigned int i) { return (Get_Unpremultiply(i) & 0x0000ff00) >> 8;}
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unsigned char Get_Blue(unsigned int i) { return (Get_Unpremultiply(i) & 0x000000ff) >> 0;}
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unsigned int Get(int x, int y) const { return Get(Width * y + x); }
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unsigned int Get(int i) const { return ARGB_to_ABGR(Get_Unpremultiply(i)); }
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};
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#endif
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