graphics.h

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/***********************************************************************
 Freeciv - Copyright (C) 1996 - A Kjeldberg, L Gregersen, P Unold
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
***********************************************************************/
 
/***********************************************************************
                          graphics.h  -  description
                             -------------------
    begin                : Mon Jul 1 2002
    copyright            : (C) 2000 by Michael Speck
                         : (C) 2002 by Rafał Bursig
    email                : Michael Speck <kulkanie@gmx.net>
                         : Rafał Bursig <bursig@poczta.fm>
***********************************************************************/
 
#ifndef FC__GRAPHICS_H
#define FC__GRAPHICS_H
 
/* SDL */
#ifdef SDL2_GFX_FROM_TREE
#include "SDL2_gfx/SDL2_rotozoom.h"
#else
#ifdef SDL2_PLAIN_INCLUDE
#include <SDL2_rotozoom.h>
#else  /* SDL2_PLAIN_INCLUDE */
#include <SDL2/SDL2_rotozoom.h>
#endif /* SDL2_PLAIN_INCLUDE */
#endif /* SDL2_GFX_FROM_TREE */
 
/* client */
#include "graphics_g.h"
 
/* gui-sdl2 */
#include "canvas.h"
#include "gui_main.h"
 
#define RECT_LIMIT  80
 
/* DUFFS LOOPs come from SDL lib (LGPL) */
/* DUFFS_LOOP_DOUBLE2 and DUFFS_LOOP_QUATRO2 was created by Rafal Bursig under GPL */
 
/* This is a very useful loop for optimizing blitters */
#if defined(_MSC_VER) && (_MSC_VER == 1300)
/* There's a bug in the Visual C++ 7 optimizer when compiling this code */
#else
#define USE_DUFFS_LOOP
#endif
 
#ifdef USE_DUFFS_LOOP
 
/* 8-times unrolled loop */
#define DUFFS_LOOP8(pixel_copy_increment, width)                        \
{ int n = (width + 7) / 8;                                              \
        switch (width & 7) {                                            \
        case 0: do {    pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 7:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 6:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 5:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 4:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 3:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 2:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 1:         pixel_copy_increment;                           \
                } while ( --n > 0 );                                    \
        }                                                               \
}
 
/* 4-times unrolled loop */
#define DUFFS_LOOP4(pixel_copy_increment, width)                        \
{ int n = (width + 3) / 4;                                              \
        switch (width & 3) {                                            \
        case 0: do {    pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 3:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 2:         pixel_copy_increment;                           \
                        fc__fallthrough;                                \
        case 1:         pixel_copy_increment;                           \
                } while ( --n > 0 );                                    \
        }                                                               \
}
 
/* 2 - times unrolled loop */
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,                        \
                                double_pixel_copy_increment, width)     \
{ int n, w = width;                                                     \
        if ( w & 1 ) {                                                  \
            pixel_copy_increment;                                       \
            w--;                                                        \
        }                                                               \
        if ( w > 0 ) {                                                  \
            n = ( w + 2 ) / 4;                                          \
            switch ( w & 2 ) {                                          \
            case 0: do {        double_pixel_copy_increment;            \
                                fc__fallthrough;                        \
            case 2:             double_pixel_copy_increment;            \
                    } while ( --n > 0 );                                \
            }                                                           \
        }                                                               \
}
 
/* 2 - times unrolled loop 4 pixels */
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,                        \
                                double_pixel_copy_increment,            \
                                quatro_pixel_copy_increment, width)     \
{ int n, w = width;                                                     \
        if (w & 1) {                                                    \
          pixel_copy_increment;                                         \
          w--;                                                          \
        }                                                               \
        if (w & 2) {                                                    \
          double_pixel_copy_increment;                                  \
          w -= 2;                                                       \
        }                                                               \
        if ( w > 0 ) {                                                  \
            n = ( w + 7 ) / 8;                                          \
            switch ( w & 4 ) {                                          \
            case 0: do {        quatro_pixel_copy_increment;            \
            case 4:             quatro_pixel_copy_increment;            \
                    } while ( --n > 0 );                                \
            }                                                           \
        }                                                               \
}
 
/* Use the 8-times version of the loop by default */
#define DUFFS_LOOP(pixel_copy_increment, width)                         \
        DUFFS_LOOP8(pixel_copy_increment, width)
 
#else
 
/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,                        \
                         double_pixel_copy_increment, width)            \
{ int n = width;                                                        \
    if ( n & 1 ) {                                                      \
        pixel_copy_increment;                                           \
        n--;                                                            \
    }                                                                   \
    for (; n > 0; --n) {                                                \
        double_pixel_copy_increment;                                    \
        n--;                                                            \
    }                                                                   \
}
 
/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,                        \
                                double_pixel_copy_increment,            \
                                quatro_pixel_copy_increment, width)     \
{ int n = width;                                                        \
        if (n & 1) {                                                    \
          pixel_copy_increment;                                         \
          n--;                                                          \
        }                                                               \
        if (n & 2) {                                                    \
          double_pixel_copy_increment;                                  \
          n -= 2;                                                       \
        }                                                               \
        for (; n > 0; --n) {                                            \
          quatro_pixel_copy_increment;                                  \
          n -= 3;                                                       \
        }                                                               \
}
 
/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP(pixel_copy_increment, width)                         \
{ int n;                                                                \
        for ( n=width; n > 0; --n ) {                                   \
                pixel_copy_increment;                                   \
        }                                                               \
}
 
#define DUFFS_LOOP8(pixel_copy_increment, width)                        \
        DUFFS_LOOP(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width)                        \
        DUFFS_LOOP(pixel_copy_increment, width)
 
#endif /* USE_DUFFS_LOOP */
 
/* Shrink surface on 320x240 screen */
#ifdef GUI_SDL2_SMALL_SCREEN
#define DEFAULT_ZOOM 0.5
#define adj_surf(surf) zoomSurface((surf), DEFAULT_ZOOM, DEFAULT_ZOOM, 0)
#else
#define DEFAULT_ZOOM 1.0
/* Cannot return the original as callers free what we return */
#define adj_surf(surf) copy_surface(surf)
#endif
 
struct gui_layer;
 
struct sdl2_data {
  int rects_count;              /* update rect. array counter */
  int guis_count;               /* gui buffers array counter */
  SDL_Rect rects[RECT_LIMIT];   /* update rect. list */
  SDL_Window *screen;           /* main screen buffer */
  SDL_Surface *map;             /* map buffer */
  SDL_Surface *dummy;           /* dummy surface for missing sprites */
  SDL_Texture *maintext;
  SDL_Renderer *renderer;
  struct canvas map_canvas;
  struct gui_layer *gui;        /* gui buffer */
  struct gui_layer **guis;      /* gui buffers used by sdl2-client widgets window menager */
  SDL_Event event;              /* main event struct */
};
 
extern struct sdl2_data main_data;
 
/* GUI layer */
/* A gui_layer is a surface with its own origin. Each widget belongs
 * to a gui_layer. gui_layers are stored in an array main_data.guis
 * (a "window manager"). */
 
struct gui_layer {
  SDL_Rect dest_rect;  /* origin: only x and y are used */
  SDL_Surface *surface;
};
 
struct gui_layer *gui_layer_new(int x, int y, SDL_Surface *surface);
void gui_layer_destroy(struct gui_layer **gui_layer);
 
struct gui_layer *get_gui_layer(SDL_Surface *surface);
 
struct gui_layer *add_gui_layer(int width, int height);
void remove_gui_layer(struct gui_layer *gui_layer);
 
void screen_rect_to_layer_rect(struct gui_layer *gui_layer, SDL_Rect *dest_rect);
void layer_rect_to_screen_rect(struct gui_layer *gui_layer, SDL_Rect *dest_rect);
 
/* ---------- */
 
int alphablit(SDL_Surface *src, SDL_Rect *srcrect,
              SDL_Surface *dst, SDL_Rect *dstrect,
              unsigned char alpha_mod);
int screen_blit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Rect *dstrect,
                unsigned char alpha_mod);
 
SDL_Surface *load_surf(const char *fname);
 
SDL_Surface *create_surf_with_format(SDL_PixelFormat *pf,
                                     int width, int height, Uint32 flags);
SDL_Surface *create_surf(int width, int height, Uint32 flags);
SDL_Surface *convert_surf(SDL_Surface *surf_in);
 
SDL_Surface *create_filled_surface(Uint16 w, Uint16 h, Uint32 flags,
                                   SDL_Color *pcolor);
 
SDL_Surface *crop_rect_from_surface(SDL_Surface *psource,
                                    SDL_Rect *prect);
 
SDL_Surface *mask_surface(SDL_Surface *src, SDL_Surface *mask,
                          int mask_offset_x, int mask_offset_y);
 
SDL_Surface *copy_surface(SDL_Surface *src);
 
int blit_entire_src(SDL_Surface *psrc,
                    SDL_Surface *pdest, Sint16 dest_x, Sint16 dest_y);
 
Uint32 get_pixel(SDL_Surface *surf, Sint16 x, Sint16 y);
Uint32 get_first_pixel(SDL_Surface *surf);
 
void create_frame(SDL_Surface *dest, Sint16 left, Sint16 top,
                  Sint16 right, Sint16 bottom,
                  SDL_Color *pcolor);
 
void create_line(SDL_Surface *dest, Sint16 x0, Sint16 y0, Sint16 x1, Sint16 y1,
                 SDL_Color *pcolor);
 
/* SDL */
void init_sdl(int f);
void quit_sdl(void);
bool set_video_mode(unsigned width, unsigned height, unsigned flags);
bool create_surfaces(int width, int height);
 
void update_main_screen(void);
 
int main_window_width(void);
int main_window_height(void);
 
/* Rect */
bool correct_rect_region(SDL_Rect *prect);
bool is_in_rect_area(int x, int y, const SDL_Rect *rect);
 
int fill_rect_alpha(SDL_Surface *surf, SDL_Rect *prect,
                    SDL_Color *pcolor);
 
int clear_surface(SDL_Surface *surf, SDL_Rect *dstrect);
 
/* ================================================================= */
 
SDL_Surface *resize_surface(const SDL_Surface *psrc, Uint16 new_width,
                            Uint16 new_height, int smooth);
 
SDL_Surface *resize_surface_box(const SDL_Surface *psrc,
                                Uint16 new_width, Uint16 new_height,
                                int smooth, bool scale_up,
                                bool absolute_dimensions);
 
SDL_Surface *crop_visible_part_from_surface(SDL_Surface *psrc);
void get_smaller_surface_rect(SDL_Surface *surf, SDL_Rect *rect);
 
#define map_rgba(format, color) \
  SDL_MapRGBA(format, (color).r, (color).g, (color).b, (color).a)
 
#define crop_rect_from_screen(rect) \
  crop_rect_from_surface(main_data.screen, &rect)
 
/* Free surface with check and clear pointer */
#define FREESURFACE(ptr)                \
do {                                    \
  if (ptr) {                            \
    SDL_FreeSurface(ptr);               \
    ptr = NULL;                         \
  }                                     \
} while (FALSE)
 
/*
 * Lock surface
 */
#define lock_surf(surf)         \
do {                            \
  if (SDL_MUSTLOCK(surf)) {     \
    SDL_LockSurface(surf);      \
  }                             \
} while (FALSE)
 
 
/*
 * Unlock surface
 */
#define unlock_surf(surf)               \
do {                                    \
  if (SDL_MUSTLOCK(surf)) {             \
    SDL_UnlockSurface(surf);            \
  }                                     \
} while (FALSE)
 
/*
 *  Lock screen surface
 */
#define lock_screen() lock_surf(main_data.screen)
 
/*
 *  Unlock screen surface
 */
#define unlock_screen() unlock_surf(main_data.screen)
 
#define putpixel(surf, x, y, pixel)                                       \
do {                                                                      \
    Uint8 *buf_ptr = ((Uint8 *)surf->pixels + (y * surf->pitch)); \
    switch (surf->format->BytesPerPixel) {                                \
                case 1:                                                   \
                        buf_ptr += x;                                     \
                        *(Uint8 *)buf_ptr = pixel;                        \
                break;                                                    \
                case 2:                                                   \
                        buf_ptr += x << 1;                                \
                        *((Uint16 *)buf_ptr) = pixel;                     \
                break;                                                    \
                case 3:                                                   \
                        buf_ptr += (x << 1) + x;                          \
                        if (is_bigendian()) {                           \
                                buf_ptr[0] = (pixel >> 16) & 0xff;      \
                                buf_ptr[1] = (pixel >> 8) & 0xff;       \
                                buf_ptr[2] = pixel & 0xff;              \
                        } else {                                        \
                                buf_ptr[0] = pixel & 0xff;              \
                                buf_ptr[1] = (pixel >> 8) & 0xff;       \
                                buf_ptr[2] = (pixel >> 16) & 0xff;      \
                        }                                               \
                break;                                                  \
                case 4:                                                 \
                        buf_ptr += x << 2;                              \
                        *((Uint32 *)buf_ptr) = pixel;                   \
                break;                                                  \
    }                                                                   \
} while (FALSE)
 
/* Blend the RGB values of two pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)  \
do {                                            \
        dR = (((sR-dR)*(A))>>8)+dR;             \
        dG = (((sG-dG)*(A))>>8)+dG;             \
        dB = (((sB-dB)*(A))>>8)+dB;             \
} while (FALSE)
 
#define ALPHA_BLEND128(sR, sG, sB, dR, dG, dB)  \
do {                                            \
  Uint32 __Src = (sR << 16 | sG << 8 | sB);     \
  Uint32 __Dst = (dR << 16 | dG << 8 | dB);     \
  __Dst = ((((__Src & 0x00fefefe) + (__Dst & 0x00fefefe)) >> 1)         \
                               + (__Src & __Dst & 0x00010101)) | 0xFF000000; \
  dR = (__Dst >> 16) & 0xFF;                    \
  dG = (__Dst >> 8 ) & 0xFF;                    \
  dB = (__Dst      ) & 0xFF;                    \
} while (FALSE)
 
#endif /* FC__GRAPHICS_H */