sprite.c

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/***********************************************************************
 Freeciv - Copyright (C) 1996-2005 - Freeciv Development Team
   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.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
/* utility */
#include "log.h"
#include "mem.h"
#include "shared.h"
 
/* client/gui-gtk-3.22 */
#include "colors.h"
#include "mapview.h"
 
#include "sprite.h"
 
#define MAX_FILE_EXTENSIONS 50
 
/************************************************************************/
struct sprite *crop_sprite(struct sprite *source,
                           int x, int y,
                           int width, int height,
                           struct sprite *mask, int mask_offset_x, int mask_offset_y,
               float scale, bool smooth)
{
  struct sprite *new = fc_malloc(sizeof(*new));
  cairo_t *cr;
 
  fc_assert_ret_val(source, NULL);
 
  new->surface = cairo_surface_create_similar(source->surface,
          CAIRO_CONTENT_COLOR_ALPHA, width, height);
  cr = cairo_create(new->surface);
  cairo_rectangle(cr, 0, 0, width, height);
  cairo_clip(cr);
  
  cairo_set_source_surface(cr, source->surface, -x, -y);
  cairo_paint(cr);
  if (mask) {
    cairo_set_operator(cr, CAIRO_OPERATOR_DEST_IN);
    cairo_set_source_surface(cr, mask->surface, mask_offset_x-x, mask_offset_y-y);
    cairo_paint(cr);
  }
  cairo_destroy(cr);
 
  return new;
}
 
/************************************************************************/
struct sprite *create_sprite(int width, int height, struct color *pcolor)
{
  struct sprite *sprite = fc_malloc(sizeof(*sprite));
  cairo_t *cr;
 
  fc_assert_ret_val(width > 0, NULL);
  fc_assert_ret_val(height > 0, NULL);
  fc_assert_ret_val(pcolor != NULL, NULL);
 
  sprite->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
         width, height);
 
  cr = cairo_create(sprite->surface);
  gdk_cairo_set_source_rgba(cr, &pcolor->color);
  cairo_paint(cr);
  cairo_destroy(cr);
 
  return sprite;
}
 
/************************************************************************/
void get_sprite_dimensions(struct sprite *sprite, int *width, int *height)
{
  *width = cairo_image_surface_get_width(sprite->surface);
  *height = cairo_image_surface_get_height(sprite->surface);
}
 
/************************************************************************/
const char **gfx_fileextensions(void)
{
  /* Includes space for hardcoded 'png' and termination NULL */
  static const char *ext[MAX_FILE_EXTENSIONS + 2] =
  {
    NULL
  };
 
  if (ext[0] == NULL) {
    int count = 0;
    GSList *formats = gdk_pixbuf_get_formats();
    GSList *next = formats;
 
    while ((next = g_slist_next(next)) != NULL && count < MAX_FILE_EXTENSIONS) {
      GdkPixbufFormat *format = g_slist_nth_data(next, 0);
      gchar **mimes = gdk_pixbuf_format_get_mime_types(format);
      int i;
 
      /* Consider .png to be supported even when there's no mime-type called "png" */
      ext[count++] = fc_strdup("png");
 
      for (i = 0; mimes[i] != NULL && count < MAX_FILE_EXTENSIONS; i++) {
        char *end = strstr(mimes[i], "/");
 
        if (end != NULL) {
          ext[count++] = fc_strdup(end + 1);
        }
      }
 
      g_strfreev(mimes);
    }
 
    g_slist_free(formats);
 
    ext[count] = NULL;
  }
 
  return ext;
}
 
/************************************************************************/
static void surf_destroy_callback(void *data)
{
  free(data);
}
 
/************************************************************************/
struct sprite *load_gfxfile(const char *filename, bool svgflag)
{
  struct sprite *spr;
  GError *err = NULL;;
  GdkPixbuf *pb = gdk_pixbuf_new_from_file(filename, &err);
  int width;
  int height;
  unsigned char *pbdata;
  int rs;
  unsigned char *cairo_data;
  unsigned char *data;
  int i, j;
  int cairo_stride;
  bool has_alpha;
  int channels;
 
  if (pb == NULL) {
    log_error(_("Can't load %s: %s"), filename, err->message);
    return NULL;
  }
 
  spr = fc_malloc(sizeof(*spr));
  spr->surface = NULL;
 
  width = gdk_pixbuf_get_width(pb);
  height = gdk_pixbuf_get_height(pb);
  pbdata = gdk_pixbuf_get_pixels(pb);
  rs = gdk_pixbuf_get_rowstride(pb);
  has_alpha = gdk_pixbuf_get_has_alpha(pb);
  channels = gdk_pixbuf_get_n_channels(pb);
 
  cairo_stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
  if (cairo_stride <= 0) {
    log_error("Cairo does not give stride for width %d", width);
    free_sprite(spr);
 
    return NULL;
  }
 
  cairo_data = fc_malloc(height * cairo_stride * 4);
  data = cairo_data;
 
  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      if (has_alpha) {
        unsigned char tmp;
 
#define MULTI_UNc(a,b) ((a * b - (b / 2)) / 0xFF)
 
        if (is_bigendian()) {
          tmp = pbdata[j * channels + 3];
          data[j * 4 + 3] = MULTI_UNc(pbdata[j * channels + 2], tmp);
          data[j * 4 + 2] = MULTI_UNc(pbdata[j * channels + 1], tmp);
          data[j * 4 + 1] = MULTI_UNc(pbdata[j * channels + 0], tmp);
          data[j * 4 + 0] = tmp;
        } else {
          tmp = MULTI_UNc(pbdata[j * channels + 2], pbdata[j * channels + 3]);
          data[j * 4 + 1] = MULTI_UNc(pbdata[j * channels + 1],
                                      pbdata[j * channels + 3]);
          data[j * 4 + 2] = MULTI_UNc(pbdata[j * channels + 0],
                                      pbdata[j * channels + 3]);
          data[j * 4 + 0] = tmp;
          data[j * 4 + 3] = pbdata[j * channels + 3];
        }
 
#undef MULTI_UNc
 
      } else {
        data[j * 4 + 3] = 255;
        data[j * 4 + 0] = pbdata[j * channels + 2];
        data[j * 4 + 1] = pbdata[j * channels + 1];
        data[j * 4 + 2] = pbdata[j * channels + 0];
      }
    }
 
    data += cairo_stride;
    pbdata += rs;
  }
 
  g_object_unref(pb);
 
  spr->surface = cairo_image_surface_create_for_data(cairo_data, CAIRO_FORMAT_ARGB32,
                                                     width, height, cairo_stride);
  if (spr->surface == NULL
      || cairo_surface_status(spr->surface) != CAIRO_STATUS_SUCCESS) {
    log_error("Cairo image surface creation error");
    free_sprite(spr);
    free(cairo_data);
 
    return NULL;
  }
 
  cairo_surface_set_user_data(spr->surface, NULL, cairo_data, surf_destroy_callback);
 
  fc_assert(cairo_image_surface_get_format(spr->surface) == CAIRO_FORMAT_ARGB32);
 
  if (cairo_surface_status(spr->surface) != CAIRO_STATUS_SUCCESS) {
    log_fatal("Failed reading graphics file: \"%s\"", filename);
 
    exit(EXIT_FAILURE);
  }
 
  return spr;
}
 
/************************************************************************/
void free_sprite(struct sprite * s)
{
  if (s->surface != NULL) {
    cairo_surface_destroy(s->surface);
  }
 
  free(s);
}
 
/************************************************************************/
struct sprite *sprite_scale(struct sprite *src, int new_w, int new_h)
{
  cairo_t *cr;
  struct sprite *new = fc_malloc(sizeof(*new));
  int width, height;
 
  get_sprite_dimensions(src, &width, &height);
 
  new->surface = cairo_surface_create_similar(src->surface, 
      CAIRO_CONTENT_COLOR_ALPHA, new_w, new_h);
 
  cr = cairo_create(new->surface);
  cairo_save(cr);
  cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
  cairo_paint(cr);
  cairo_restore(cr);
  cairo_scale(cr, (double) new_w / (double) width, (double) new_h / (double) height);
  cairo_set_source_surface(cr, src->surface, 0, 0);
  cairo_paint(cr);
 
  cairo_destroy(cr);
 
  return new;
}
 
/************************************************************************/
void sprite_get_bounding_box(struct sprite * sprite, int *start_x,
                             int *start_y, int *end_x, int *end_y)
{
  unsigned char *data = cairo_image_surface_get_data(sprite->surface);
  int width = cairo_image_surface_get_width(sprite->surface);
  int height = cairo_image_surface_get_height(sprite->surface);
  int i, j;
  int endian;
 
  if (is_bigendian()) {
    endian = 0;
  } else {
    endian = 3;
  }
 
  fc_assert(cairo_image_surface_get_format(sprite->surface) == CAIRO_FORMAT_ARGB32);
 
  /* parses mask image for the first column that contains a visible pixel */
  *start_x = -1;
  for (i = 0; i < width && *start_x == -1; i++) {
    for (j = 0; j < height; j++) {
      if (data[(j * width + i) * 4 + endian]) {
        *start_x = i;
        break;
      }
    }
  }
 
  /* parses mask image for the last column that contains a visible pixel */
  *end_x = -1;
  for (i = width - 1; i >= *start_x && *end_x == -1; i--) {
    for (j = 0; j < height; j++) {
      if (data[(j * width + i) * 4 + endian]) {
        *end_x = i;
        break;
      }
    }
  }
 
  /* parses mask image for the first row that contains a visible pixel */
  *start_y = -1;
  for (i = 0; i < height && *start_y == -1; i++) {
    for (j = *start_x; j <= *end_x; j++) {
      if (data[(i * width + j) * 4 + endian]) {
        *start_y = i;
        break;
      }
    }
  }
 
  /* parses mask image for the last row that contains a visible pixel */
  *end_y = -1;
  for (i = height - 1; i >= *end_y && *end_y == -1; i--) {
    for (j = *start_x; j <= *end_x; j++) {
      if (data[(i * width + j) * 4 + endian]) {
        *end_y = i;
        break;
      }
    }
  }
}
 
/************************************************************************/
struct sprite *crop_blankspace(struct sprite *s)
{
  int x1, y1, x2, y2;
 
  sprite_get_bounding_box(s, &x1, &y1, &x2, &y2);
 
  return crop_sprite(s, x1, y1, x2 - x1 + 1, y2 - y1 + 1, NULL, -1, -1,
                     1.0, FALSE);
}
 
/************************************************************************/
GdkPixbuf *sprite_get_pixbuf(struct sprite *sprite)
{
  int width, height;
 
  if (!sprite) {
    return NULL;
  }
 
  get_sprite_dimensions(sprite, &width, &height);
 
  return surface_get_pixbuf(sprite->surface, width, height);
}
 
/************************************************************************/
GdkPixbuf *surface_get_pixbuf(cairo_surface_t *surf, int width, int height)
{
  cairo_t *cr;
  cairo_surface_t *tmpsurf;
  GdkPixbuf *pb;
  unsigned char *pixels;
  int rowstride;
  int i;
 
  pb = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, width, height);
  pixels = gdk_pixbuf_get_pixels(pb);
  rowstride = gdk_pixbuf_get_rowstride(pb);
 
  tmpsurf = cairo_image_surface_create_for_data(pixels, CAIRO_FORMAT_ARGB32,
                                                width, height, rowstride);
 
  cr = cairo_create(tmpsurf);
  cairo_save(cr);
  cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
  cairo_paint(cr);
  cairo_restore(cr);
  cairo_set_source_surface(cr, surf, 0, 0);
  cairo_paint(cr);
  cairo_destroy(cr);
 
  for (i = height; i > 0; i--) {
    unsigned char *p = pixels;
    unsigned char *end = p + 4 * width;
    unsigned char tmp;
 
#define DIV_UNc(a,b) (((guint16) (a) * 0xFF + ((b) / 2)) / (b))
 
    while (p < end) {
      tmp = p[0];
 
      if (is_bigendian()) {
        if (tmp != 0) {
          p[0] = DIV_UNc(p[1], tmp);
          p[1] = DIV_UNc(p[2], tmp);
          p[2] = DIV_UNc(p[3], tmp);
          p[3] = tmp;
        } else {
          p[1] = p[2] = p[3] = 0;
        }
      } else {
        if (p[3] != 0) {
          p[0] = DIV_UNc(p[2], p[3]);
          p[1] = DIV_UNc(p[1], p[3]);
          p[2] = DIV_UNc(tmp, p[3]);
        } else {
          p[0] = p[1] = p[2] = 0;
        }
      }
 
      p += 4;
    }
 
#undef DIV_UNc
 
    pixels += rowstride;
  }
 
  cairo_surface_destroy(tmpsurf);
 
  return pb;
}
 
/************************************************************************/
GdkPixbuf *create_extra_pixbuf(const struct extra_type *pextra)
{
  struct drawn_sprite sprs[80];
  int count, w, h, canvas_x, canvas_y;
  GdkPixbuf *pixbuf;
  struct canvas canvas = FC_STATIC_CANVAS_INIT;
  cairo_t *cr;
 
  w = tileset_tile_width(tileset);
  h = tileset_tile_height(tileset);
 
  canvas.surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
  canvas_x = 0;
  canvas_y = 0;
 
  cr = cairo_create(canvas.surface);
  cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
  cairo_paint(cr);
  cairo_destroy(cr);
 
  count = fill_basic_extra_sprite_array(tileset, sprs, pextra);
  put_drawn_sprites(&canvas, 1.0, canvas_x, canvas_y, count, sprs, FALSE);
 
  pixbuf = surface_get_pixbuf(canvas.surface, w, h);
  cairo_surface_destroy(canvas.surface);
 
  return pixbuf;
}
 
/************************************************************************/
struct sprite *load_gfxnumber(int num)
{
  int width, height;
  char buf[10];
  struct sprite *spr;
  struct color *sprcolor = color_alloc(0xff, 0xff, 0x00);
  struct color *textcolor = color_alloc(0x00, 0x00, 0x00);
  cairo_t *cr;
  int border = 2;
 
  fc_snprintf(buf, sizeof(buf), "%d", num);
  get_text_size(&width, &height, FONT_CITY_PROD, buf);
 
  spr = create_sprite(width + border * 2, height + border * 2, sprcolor);
 
  cr = cairo_create(spr->surface);
 
  surface_put_text(cr, border, border, 1.0, FONT_CITY_PROD, textcolor, buf);
 
  cairo_destroy(cr);
 
  color_free(textcolor);
  color_free(sprcolor);
 
  return spr;
}