initial checkin of C++ port (in progress)

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@2 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gfx/gfx.hpp

@@ -0,0 +1,109 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2006 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+#ifndef HEADER_GFX_GFX
+#define HEADER_GFX_GFX
+
+/** @file gfx/gfx.hpp
+ *
+ *  Graphics/image processing functions.
+ */
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include "../util/prec.hpp"
+
+// ----------------------------------------------------------------------------- : Resampling
+
+/// Resample (resize) an image, uses bilenear filtering
+/** The algorithm first resizes in horizontally, then vertically,
+ *  the two passes are essentially the same:
+ *   - for each row:
+ *     - each input pixel becomes a fixed amount of output (in 1<<shift fixed point math)
+ *     - for each output pixel:
+ *       - 'eat' input pixels until the total is 1<<shift
+ *       - write the total to the output pixel
+ *   - to ensure the sum of all the pixel amounts is exacly width<<shift an extra rest amount
+ *     is 'eaten' from the first pixel
+ *
+ *  Uses fixed point numbers internally
+ */
+void resample(const Image& imgIn, Image& imgOut);
+
+/// Resamples an image, first clips the input image to a specified rectangle,
+/// that rectangle is resampledinto the entire output image
+void resample_and_clip(const Image& imgIn, Image& imgOut, wxRect rect);
+
+// ----------------------------------------------------------------------------- : Image rotation
+
+/// Rotates an image counter clockwise
+/// angle must be a multiple of 90, i.e. {0,90,180,270}
+Image rotateImageBy(const Image& image, int angle);
+
+// ----------------------------------------------------------------------------- : Blending
+
+/// Blends two images together, using a horizontal gradient
+/** The result is stored in img1
+ *  To the left the color is that of img1, to the right of img2
+ */
+void hblend(Image& img1, const Image& img2);
+
+/// Blends two images together, using a vertical gradient
+void vblend(Image& img1, const Image& img2);
+
+/// Blends two images together, using a third image as a mask
+/** The result is stored in img1
+ *  mask is used as a mask, white pixels are taken from img1, black pixels from img2
+ *  color channels are blended separatly
+ */
+void maskBlend(Image& img1, const Image& img2, const Image& mask);
+
+// ----------------------------------------------------------------------------- : Combining
+
+/// Ways in which images can be combined, similair to what Photoshop supports
+enum ImageCombine
+{	COMBINE_NORMAL
+,	COMBINE_ADD
+,	COMBINE_SUBTRACT
+,	COMBINE_STAMP
+,	COMBINE_DIFFERENCE
+,	COMBINE_NEGATION
+,	COMBINE_MULTIPLY
+,	COMBINE_DARKEN
+,	COMBINE_LIGHTEN
+,	COMBINE_COLOR_DODGE
+,	COMBINE_COLOR_BURN
+,	COMBINE_SCREEN
+,	COMBINE_OVERLAY
+,	COMBINE_HARD_LIGHT
+,	COMBINE_SOFT_LIGHT
+,	COMBINE_REFLECT
+,	COMBINE_GLOW
+,	COMBINE_FREEZE
+,	COMBINE_HEAT
+,	COMBINE_AND
+,	COMBINE_OR
+,	COMBINE_XOR
+,	COMBINE_SHADOW
+};
+
+/// Combine image b onto image a using some combining function.
+/// The results are stored in the image A.
+/// This image gets the alpha channel from B, it should then be
+/// drawn onto the area where A originated.
+void combineImage(Image& a, const Image& b, ImageCombine combine);
+
+/// Draw an image to a DC using a combining function
+void drawCombineImage(DC& dc, UInt x, UInt y, const Image& img, ImageCombine combine);
+
+// ----------------------------------------------------------------------------- : Utility
+
+inline int bot(int x) { return max(0,   x); } //^ bottom range check for color values
+inline int top(int x) { return min(255, x); } //^ top    range check for color values
+inline int col(int x) { return top(bot(x)); } //^ top and bottom range check for color values
+
+// ----------------------------------------------------------------------------- : EOF
+#endif