gp_transform.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2009-2010 Jiri "BlueBear" Dluhos
 *                         <jiri.bluebear.dluhos@gmail.com>
 *
 * Copyright (C) 2009-2024 Cyril Hrubis <metan@ucw.cz>
 *
 * Copyright (C) 2011      Tomas Gavenciak <gavento@ucw.cz>
 */
 
#ifndef CORE_GP_TRANSFORM_H
#define CORE_GP_TRANSFORM_H
 
#include <core/gp_common.h>
 
#define GP_TRANSFORM_X(pixmap, x) do {   \
        if ((pixmap)->x_swap)            \
                x = (pixmap)->w - x - 1; \
} while (0)
 
#define GP_TRANSFORM_Y(pixmap, y) do {   \
        if ((pixmap)->y_swap)            \
                y = (pixmap)->h - y - 1; \
} while (0)
 
#define GP_TRANSFORM_SWAP(pixmap, x, y) do { \
        if ((pixmap)->axes_swap)             \
                GP_SWAP(x, y);               \
} while (0)
 
#define GP_TRANSFORM_POINT(pixmap, x, y) do { \
        GP_TRANSFORM_SWAP(pixmap, x, y);      \
        GP_TRANSFORM_X(pixmap, x);            \
        GP_TRANSFORM_Y(pixmap, y);            \
} while (0)
 
#define GP_TRANSFORM_RECT(pixmap, x, y, w, h) do { \
        GP_TRANSFORM_SWAP(pixmap, x, y);           \
        GP_TRANSFORM_SWAP(pixmap, w, h);           \
                                                   \
        if ((pixmap)->x_swap)                      \
                x = (pixmap)->w - x - w;           \
                                                   \
        if ((pixmap)->y_swap)                      \
                y = (pixmap)->h - y - h;           \
} while (0)
 
/*
 * Transform "user"-coordinates to "real"-coordinates for a blit
 * called as gp_blit(c1, x1, y1, w, h, c2, x2, y2).
 * All x1, y1, x2, y2, w, h are adjusted.
 */
#define GP_TRANSFORM_BLIT(c1, x1, y1, w, h, c2, x2, y2) do { \
        GP_TRANSFORM_RECT(c1, x1, y1, w, h);            \
        int w2 = w, h2 = h;                             \
        GP_TRANSFORM_SWAP(c2, w2, h2);                  \
        GP_TRANSFORM_RECT(c2, x2, y2, w2, h2);          \
} while (0)
 
#define GP_RETRANSFORM_POINT(pixmap, x, y) do { \
        GP_TRANSFORM_X(pixmap, x);              \
        GP_TRANSFORM_Y(pixmap, y);              \
        GP_TRANSFORM_SWAP(pixmap, x, y);        \
} while (0)
 
#endif /* CORE_GP_TRANSFORM_H */