Class: GD::Image

Inherits:
Object
  • Object
show all
Defined in:
ext/gd/image.c,
lib/gd.rb

Constant Summary collapse

DEFAULT_FONT = 
"/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
DEFAULT_FONT_SIZE = 
12

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/gd/image.c', line 3

static VALUE gd_image_initialize(int argc, VALUE *argv, VALUE self) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  wrap->img = NULL;

  if (argc == 0) {
    return self;
  }
  if (argc != 2) {
    rb_raise(rb_eArgError, "expected 0 or 2 arguments");
  }

  int w = NUM2INT(argv[0]);
  int h = NUM2INT(argv[1]);
  if (w <= 0 || h <= 0)
    rb_raise(rb_eArgError, "width and height must be positive");

  wrap->img = gdImageCreateTrueColor(w,h);
  gdImageSaveAlpha(wrap->img, 1);
  gdImageAlphaBlending(wrap->img, 0);

  int transparent = gdTrueColorAlpha(0,0,0,127);
  gdImageFilledRectangle(wrap->img, 0,0,w,h, transparent);

  gdImageAlphaBlending(wrap->img, 1);

  int t = gdTrueColorAlpha(0,0,0,127);
  gdImageFilledRectangle(wrap->img, 0, 0, w-1, h-1, t);

  if (!wrap->img)
    rb_raise(rb_eRuntimeError, "gdImageCreateTrueColor failed");

  return self;
}

Class Method Details

.new_true_color(width, height) ⇒ Object 



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# File 'ext/gd/image.c', line 75

static VALUE gd_image_s_new_true_color(VALUE klass, VALUE width, VALUE height) {
  VALUE obj = rb_class_new_instance(0, NULL, klass);
  gd_image_initialize_true_color(obj, width, height);
  return obj;
}

.open(path) ⇒ Object 



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# File 'ext/gd/image.c', line 141

static VALUE gd_image_open(VALUE klass, VALUE path) {
  const char *filename = StringValueCStr(path);

  FILE *f = fopen(filename, "rb");
  if (!f) rb_sys_fail(filename);

  gdImagePtr img = NULL;

  const char *ext = strrchr(filename, '.');
  if (!ext) rb_raise(rb_eArgError, "unknown image type");

  if (strcmp(ext, ".png") == 0) {
    img = gdImageCreateFromPng(f);
  } else if (strcmp(ext, ".jpg") == 0 || strcmp(ext, ".jpeg") == 0) {
    img = gdImageCreateFromJpeg(f);
  } else if (strcmp(ext, ".webp") == 0) {
    img = gdImageCreateFromWebp(f);
  } else if (strcmp(ext, ".gif") == 0) {
    img = gdImageCreateFromGif(f);
  } else {
    fclose(f);
    rb_raise(rb_eArgError, "unsupported format");
  }

  fclose(f);
  if (!img) rb_raise(rb_eRuntimeError, "image decode failed");

  VALUE obj = rb_class_new_instance(0, NULL, klass);
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(obj, gd_image_wrapper, &gd_image_type, wrap);
  wrap->img = img;

  return obj;
}

Instance Method Details

#alpha_blending=(flag) ⇒ Object 



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# File 'ext/gd/image.c', line 176

static VALUE gd_image_alpha_blending(VALUE self, VALUE flag) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

    gdImageAlphaBlending(wrap->img, RTEST(flag));
    return self;
}

#arc(*args) ⇒ Object 



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# File 'ext/gd/arc.c', line 3

static VALUE
gd_image_arc(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vw, vh, vstart, vend, vcolor, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "7:", &vcx, &vcy, &vw, &vh, &vstart, &vend, &vcolor, &opts);

  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int w  = NUM2INT(vw);
  int h  = NUM2INT(vh);
  int s  = NUM2INT(vstart);
  int e  = NUM2INT(vend);
  int c  = color_to_gd(wrap->img, vcolor);

  int t = NIL_P(thickness) ? 1 : NUM2INT(thickness);
  int half = t / 2;

  for (int i = -half; i <= half; i++) {
    gdImageArc(wrap->img, cx + i, cy, w, h, s, e, c);
  }

  return self;
}

#circle(*args) ⇒ Object 



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# File 'ext/gd/circle.c', line 3

static VALUE gd_image_circle(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vradius, vcolor, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "4:", &vcx, &vcy, &vradius, &vcolor, &opts);

  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int r  = NUM2INT(vradius);
  int c  = color_to_gd(wrap->img, vcolor);

  int t = NIL_P(thickness) ? 1 : NUM2INT(thickness);
  int half = t / 2;

  for (int i = -half; i <= half; i++) {
    gdImageArc(wrap->img,
               cx, cy,
               (r + i) * 2, (r + i) * 2,
               0, 360,
               c);
  }

  return self;
}

#clone ⇒ Object 



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# File 'ext/gd/image.c', line 81

static VALUE gd_image_clone(VALUE self) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  if (!wrap->img) rb_raise(rb_eRuntimeError, "cannot clone: image is NULL");

  gdImagePtr copy = gdImageClone(wrap->img);
  if (!copy) rb_raise(rb_eRuntimeError, "gdImageClone failed");

  VALUE obj = rb_class_new_instance(0, NULL, CLASS_OF(self));
  gd_image_wrapper *w2;
  TypedData_Get_Struct(obj, gd_image_wrapper, &gd_image_type, w2);
  w2->img = copy;

  return obj;
}

#copy ⇒ Object 



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# File 'ext/gd/image.c', line 204

static VALUE gd_image_copy (
  VALUE self, VALUE src,
  VALUE dx, VALUE dy,
  VALUE sx, VALUE sy,
  VALUE w, VALUE h
) {
  gd_image_wrapper *dst;
  gd_image_wrapper *srcw;

  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, dst);
  TypedData_Get_Struct(src,  gd_image_wrapper, &gd_image_type, srcw);

  gdImageCopy(
    dst->img,
    srcw->img,
    NUM2INT(dx), NUM2INT(dy),
    NUM2INT(sx), NUM2INT(sy),
    NUM2INT(w),  NUM2INT(h)
  );

  return Qnil;
}

#copy_merge(src, dx, dy, sx, sy, w, h, pct) ⇒ Object 



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# File 'ext/gd/blit.c', line 10

static VALUE gd_image_copy_merge(
  VALUE self, VALUE src,
  VALUE dx, VALUE dy,
  VALUE sx, VALUE sy,
  VALUE w, VALUE h,
  VALUE pct
) {
  gd_image_wrapper *dst_wrap;
  gd_image_wrapper *src_wrap;

  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, dst_wrap);
  TypedData_Get_Struct(src,  gd_image_wrapper, &gd_image_type, src_wrap);

  gdImageCopyMerge(
    dst_wrap->img,
    src_wrap->img,
    NUM2INT(dx), NUM2INT(dy),
    NUM2INT(sx), NUM2INT(sy),
    NUM2INT(w),  NUM2INT(h),
    NUM2INT(pct)
  );

  return self;
}

#copy_resize(*args) ⇒ Object 



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# File 'ext/gd/image.c', line 227

static VALUE gd_image_copy_resize(int argc, VALUE *argv, VALUE self) {
  VALUE src_img;
  VALUE dst_x, dst_y, src_x, src_y, src_w, src_h, dst_w, dst_h, resample;

  rb_scan_args(argc, argv, "91",
    &src_img, &dst_x, &dst_y, &src_x, &src_y,
    &src_w, &src_h, &dst_w, &dst_h,
    &resample
  );

  gd_image_wrapper *dst, *src;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, dst);
  TypedData_Get_Struct(src_img, gd_image_wrapper, &gd_image_type, src);

  int dx = NUM2INT(dst_x);
  int dy = NUM2INT(dst_y);
  int sx = NUM2INT(src_x);
  int sy = NUM2INT(src_y);
  int sw = NUM2INT(src_w);
  int sh = NUM2INT(src_h);
  int dw = NUM2INT(dst_w);
  int dh = NUM2INT(dst_h);

  int do_resample = RTEST(resample);

  if (do_resample) {
    gdImageCopyResampled(
      dst->img, src->img,
      dx, dy,
      sx, sy,
      dw, dh,
      sw, sh
    );
  } else {
    gdImageCopyResized(
      dst->img, src->img,
      dx, dy,
      sx, sy,
      dw, dh,
      sw, sh
    );
  }

  return self;
}

#crop(vx, vy, vw, vh) ⇒ Object 



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# File 'ext/gd/transform.c', line 11

static VALUE gd_image_crop(VALUE self, VALUE vx, VALUE vy, VALUE vw, VALUE vh) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

    gdRect r;
    r.x = NUM2INT(vx);
    r.y = NUM2INT(vy);
    r.width  = NUM2INT(vw);
    r.height = NUM2INT(vh);

    gdImagePtr out = gdImageCrop(wrap->img, &r);
    if (!out) rb_raise(rb_eRuntimeError, "crop failed");

    return wrap_new_image(out, CLASS_OF(self));
}

#draw_string(x, y, text, color, size: DEFAULT_FONT_SIZE, font: DEFAULT_FONT) ⇒ Object 



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# File 'lib/gd.rb', line 7

def draw_string(x, y, text, color, size: DEFAULT_FONT_SIZE, font: DEFAULT_FONT)
  self.text(text, {
    x: x,
    y: y,
    size: size,
    color: color,
    font: font
  })
end

#ellipse(*args) ⇒ Object 



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# File 'ext/gd/ellipse.c', line 7

static VALUE gd_image_ellipse(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vw, vh, vcolor, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "5:", &vcx, &vcy, &vw, &vh, &vcolor, &opts);

  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int w  = NUM2INT(vw);
  int h  = NUM2INT(vh);
  int c  = color_to_gd(wrap->img, vcolor);

  int t = NIL_P(thickness) ? 1 : NUM2INT(thickness);
  int half = t / 2;

  for (int i = -half; i <= half; i++) {
    gdImageArc(wrap->img,
               cx, cy,
               w + i * 2, h + i * 2,
               0, 360,
               c);
  }

  return self;
}

#fill(color) ⇒ Object

  • x

    imagefill — Flood fill



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# File 'ext/gd/fill.c', line 6

static VALUE gd_image_fill(VALUE self, VALUE color) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  if (!wrap || !wrap->img)
    rb_raise(rb_eRuntimeError, "uninitialized GD::Image");

  int c = color_to_gd(wrap->img, color);

  gdImageFilledRectangle(
    wrap->img,
    0, 0,
    gdImageSX(wrap->img) - 1,
    gdImageSY(wrap->img) - 1,
    c
  );

  return self;
}

#filled_arc(*args) ⇒ Object 



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# File 'ext/gd/arc.c', line 37

static VALUE
gd_image_filled_arc(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vw, vh, vstart, vend, vcolor;
  rb_scan_args(argc, argv, "7", &vcx, &vcy, &vw, &vh, &vstart, &vend, &vcolor);

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int w  = NUM2INT(vw);
  int h  = NUM2INT(vh);
  int s  = NUM2INT(vstart);
  int e  = NUM2INT(vend);
  int c  = color_to_gd(wrap->img, vcolor);

  gdImageFilledArc(wrap->img, cx, cy, w, h, s, e, c, gdArc);

  return self;
}

#filled_circle(*args) ⇒ Object 



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# File 'ext/gd/circle.c', line 37

static VALUE gd_image_filled_circle(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vradius, vcolor, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "4:", &vcx, &vcy, &vradius, &vcolor, &opts);

  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int r  = NUM2INT(vradius);
  int c  = color_to_gd(wrap->img, vcolor);

  /* Fill */
  gdImageFilledEllipse(wrap->img,
                       cx, cy,
                       r * 2, r * 2,
                       c);

  /* Stroke */
  int t = NIL_P(thickness) ? 1 : NUM2INT(thickness);
  int half = t / 2;

  for (int i = -half; i <= half; i++) {
    gdImageArc(wrap->img,
               cx, cy,
               (r + i) * 2, (r + i) * 2,
               0, 360,
               c);
  }

  return self;
}

#filled_ellipse(*args) ⇒ Object 



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# File 'ext/gd/ellipse.c', line 42

static VALUE gd_image_filled_ellipse(int argc, VALUE *argv, VALUE self)
{
  VALUE vcx, vcy, vw, vh, vcolor, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "5:", &vcx, &vcy, &vw, &vh, &vcolor, &opts);

  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int cx = NUM2INT(vcx);
  int cy = NUM2INT(vcy);
  int w  = NUM2INT(vw);
  int h  = NUM2INT(vh);
  int c  = color_to_gd(wrap->img, vcolor);

  /* Fill */
  gdImageFilledEllipse(wrap->img, cx, cy, w, h, c);

  /* Stroke */
  int t = NIL_P(thickness) ? 1 : NUM2INT(thickness);
  int half = t / 2;

  for (int i = -half; i <= half; i++) {
    gdImageArc(wrap->img,
               cx, cy,
               w + i * 2, h + i * 2,
               0, 360,
               c);
  }

  return self;
}

#filled_polygon(points, color) ⇒ Object 



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# File 'ext/gd/polygon.c', line 72

static VALUE gd_image_filled_polygon(VALUE self, VALUE points, VALUE color) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  if (!wrap || !wrap->img) {
    rb_raise(rb_eRuntimeError, "uninitialized GD::Image");
  }

  int count = 0;
  gdPointPtr pts = build_points(points, &count);

  if (!pts || count < 3) {
    if (pts) xfree(pts);
    rb_raise(rb_eArgError, "points must be an Array of at least 3 [x,y] pairs");
  }

  int c = color_to_gd(wrap->img, color);
  gdImageFilledPolygon(wrap->img, pts, count, c);

  xfree(pts);
  return self;
}

#filled_rectangle(*args) ⇒ Object 



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# File 'ext/gd/rectangle.c', line 32

static VALUE gd_image_filled_rectangle(int argc, VALUE *argv, VALUE self) {
  VALUE x1, y1, x2, y2, color, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "5:", &x1, &y1, &x2, &y2, &color, &opts);
  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int c = color_to_gd(wrap->img, color);
  if (!NIL_P(thickness)) {
    gdImageSetThickness(wrap->img, NUM2INT(thickness));
  }
  gdImageFilledRectangle(wrap->img,
                         NUM2INT(x1), NUM2INT(y1),
                         NUM2INT(x2), NUM2INT(y2),
                         c);
  gdImageSetThickness(wrap->img, 1);
  return Qnil;
}

#filter(*args) ⇒ Object 



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# File 'ext/gd/filter.c', line 27

static VALUE gd_image_filter(int argc, VALUE *argv, VALUE self) {
  VALUE type, arg1, arg2, arg3, arg4;
  rb_scan_args(argc, argv, "14", &type, &arg1, &arg2, &arg3, &arg4);

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  type = rb_obj_as_string(type);
  const char *name = StringValueCStr(type);

  if (strcmp(name, "negate") == 0) {
    gdImageNegate(wrap->img);
  }
  else if (strcmp(name, "grayscale") == 0) {
    gdImageGrayScale(wrap->img);
  }
  else if (strcmp(name, "brightness") == 0) {
    gdImageBrightness(wrap->img, NUM2INT(arg1));
  }
  else if (strcmp(name, "contrast") == 0) {
    gdImageContrast(wrap->img, NUM2INT(arg1));
  }
  else if (strcmp(name, "colorize") == 0) {
    rb_raise(rb_eNotImpError, "colorize not supported by libgd");
  }
  else if (strcmp(name, "edge_detect") == 0) {
    gdImageEdgeDetectQuick(wrap->img);
  }
  else if (strcmp(name, "emboss") == 0) {
    gdImageEmboss(wrap->img);
  }
  else if (strcmp(name, "gaussian_blur") == 0) {
    gdImageGaussianBlur(wrap->img);
  }
  else if (strcmp(name, "selective_blur") == 0) {
    gdImageSelectiveBlur(wrap->img);
  }
  else if (strcmp(name, "mean_removal") == 0) {
    gdImageMeanRemoval(wrap->img);
  }
  else if (strcmp(name, "smooth") == 0) {
    gdImageSmooth(wrap->img, NUM2INT(arg1));
  }
  else if (strcmp(name, "pixelate") == 0) {
    gdImagePixelate(
      wrap->img,
      NUM2INT(arg1),
      RTEST(arg2)
    );
  }
  else if (strcmp(name, "scatter") == 0) {
    gdImageScatter(
      wrap->img,
      NUM2INT(arg1),
      NUM2INT(arg2)
    );
  }
  else if (strcmp(name, "sepia") == 0) {
    gd_image_apply_sepia(wrap->img);
  }
  else {
    rb_raise(rb_eArgError, "unknown filter");
  }

  return self;
}

#get_pixel(vx, vy) ⇒ Object 



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# File 'ext/gd/pixel.c', line 14

static VALUE gd_image_get_pixel(VALUE self, VALUE vx, VALUE vy) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int x = NUM2INT(vx);
  int y = NUM2INT(vy);

  if (!wrap || !wrap->img) rb_raise(rb_eRuntimeError, "uninitialized GD::Image");

  int p = gdImageGetTrueColorPixel(wrap->img, x, y);

  int r = gdTrueColorGetRed(p);
  int g = gdTrueColorGetGreen(p);
  int b = gdTrueColorGetBlue(p);
  int a = gdTrueColorGetAlpha(p);

  VALUE ary = rb_ary_new_capa(4);
  rb_ary_push(ary, INT2NUM(r));
  rb_ary_push(ary, INT2NUM(g));
  rb_ary_push(ary, INT2NUM(b));
  rb_ary_push(ary, INT2NUM(a));

  return ary;
}

#height ⇒ Object 



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# File 'ext/gd/image.c', line 198

static VALUE gd_image_height(VALUE self) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);
    return INT2NUM(gdImageSY(wrap->img));
}

#line(*args) ⇒ Object 



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# File 'ext/gd/draw_line.c', line 5

static VALUE gd_image_line(int argc, VALUE *argv, VALUE self) {
  VALUE x1, y1, x2, y2, color, opts;
  opts = Qnil;

  rb_scan_args(argc, argv, "5:", &x1, &y1, &x2, &y2, &color, &opts);

  VALUE thickness = Qnil;
  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int ix1 = NUM2INT(x1);
  int iy1 = NUM2INT(y1);
  int ix2 = NUM2INT(x2);
  int iy2 = NUM2INT(y2);

  int ox1 = ix1;
  int oy1 = iy1;
  int ox2 = ix2;
  int oy2 = iy2;

  int w = wrap->img->sx;
  int h = wrap->img->sy;

  /* Clip to image bounds */
  int xmin = 0;
  int ymin = 0;
  int xmax = w - 1;
  int ymax = h - 1;

  if (!gd_clip_line_to_rect(&ix1, &iy1, &ix2, &iy2, xmin, ymin, xmax, ymax)) {
    rb_warn("Line is completely outside image bounds");
    return Qnil;
  }

  if (ix1 != ox1 || iy1 != oy1 || ix2 != ox2 || iy2 != oy2) {
    rb_warn("Line coordinates clipped to image bounds");
  }

  if (TYPE(color) != T_ARRAY || RARRAY_LEN(color) < 3 || RARRAY_LEN(color) > 4) {
    rb_raise(rb_eArgError, "color must be [r,g,b] or [r,g,b,a]");
  }

  int c = color_to_gd(wrap->img, color);
  int old = 1;

  if (!NIL_P(thickness)) {
    gdImageSetThickness(wrap->img, NUM2INT(thickness));
  }
  gdImageLine(wrap->img, NUM2INT(x1), NUM2INT(y1), NUM2INT(x2), NUM2INT(y2), c);
  gdImageSetThickness(wrap->img, old);

  return Qnil;
}

#polygon(points, color) ⇒ Object 



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# File 'ext/gd/polygon.c', line 58

static VALUE gd_image_polygon(VALUE self, VALUE points, VALUE color) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int count = 0;
  gdPointPtr pts = build_points(points, &count);
  int c = color_to_gd(wrap->img, color);

  gdImagePolygon(wrap->img, pts, count, c);

  xfree(pts);
  return self;
}

#rectangle(*args) ⇒ Object

  • imagerectangle — Draw a rectangle

  • imagefilledrectangle — Draw a filled rectangle



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# File 'ext/gd/rectangle.c', line 6

static VALUE gd_image_rectangle(int argc, VALUE *argv, VALUE self) {
  VALUE x1, y1, x2, y2, color, opts;
  VALUE thickness = Qnil;
  opts = Qnil;

  rb_scan_args(argc, argv, "5:", &x1, &y1, &x2, &y2, &color, &opts);
  if (!NIL_P(opts)) {
    thickness = rb_hash_aref(opts, ID2SYM(rb_intern("thickness")));
  }

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int c = color_to_gd(wrap->img, color);

  if (!NIL_P(thickness)) {
    gdImageSetThickness(wrap->img, NUM2INT(thickness));
  }
  gdImageRectangle(wrap->img,
                   NUM2INT(x1), NUM2INT(y1),
                   NUM2INT(x2), NUM2INT(y2),
                   c);
  gdImageSetThickness(wrap->img, 1);
  return Qnil;
}

#resize(vw, vh) ⇒ Object 



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# File 'ext/gd/transform.c', line 27

static VALUE gd_image_scale(VALUE self, VALUE vw, VALUE vh) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

    int w = NUM2INT(vw);
    int h = NUM2INT(vh);

    gdImagePtr out = gdImageScale(wrap->img, w, h);
    if (!out) rb_raise(rb_eRuntimeError, "scale failed");

    return wrap_new_image(out, CLASS_OF(self));
}

#save(*args) ⇒ Object 



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# File 'ext/gd/encode.c', line 3

static VALUE gd_image_save(int argc, VALUE *argv, VALUE self) {
  VALUE path, opts;
  rb_scan_args(argc, argv, "11", &path, &opts);

  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  const char *filename = StringValueCStr(path);

  const char *ext = strrchr(filename, '.');
  if (!ext) rb_raise(rb_eArgError, "file extension required");

  FILE *f = fopen(filename, "wb");
  if (!f) rb_sys_fail(filename);

  if (strcmp(ext, ".png") == 0) {
    gdImageSaveAlpha(wrap->img, 1);
    gdImageAlphaBlending(wrap->img, 0);
    gdImagePng(wrap->img, f);
  } else if (strcmp(ext, ".jpg") == 0 || strcmp(ext, ".jpeg") == 0) {
    int quality = 90;
    if (opts != Qnil) {
      VALUE q = rb_hash_aref(opts, ID2SYM(rb_intern("quality")));
      if (!NIL_P(q)) quality = NUM2INT(q);
    }
    gdImageJpeg(wrap->img, f, quality);
  } else if (strcmp(ext, ".webp") == 0) {
    gdImageWebp(wrap->img, f);
  } else {
    fclose(f);
    rb_raise(rb_eArgError, "unsupported format");
  }

  fclose(f);
  return Qtrue;
}

#save_alpha=(flag) ⇒ Object 



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# File 'ext/gd/image.c', line 184

static VALUE gd_image_save_alpha(VALUE self, VALUE flag) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

    gdImageSaveAlpha(wrap->img, RTEST(flag));
    return self;
}

#scale(vw, vh) ⇒ Object 



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# File 'ext/gd/transform.c', line 27

static VALUE gd_image_scale(VALUE self, VALUE vw, VALUE vh) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

    int w = NUM2INT(vw);
    int h = NUM2INT(vh);

    gdImagePtr out = gdImageScale(wrap->img, w, h);
    if (!out) rb_raise(rb_eRuntimeError, "scale failed");

    return wrap_new_image(out, CLASS_OF(self));
}

#set_pixel(x, y, color) ⇒ Object 



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# File 'ext/gd/pixel.c', line 3

static VALUE gd_image_set_pixel(VALUE self, VALUE x, VALUE y, VALUE color) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int c = color_to_gd(wrap->img, color);

  gdImageSetPixel(wrap->img, NUM2INT(x), NUM2INT(y), c);

  return Qnil;
}

#text(text, opts) ⇒ Object

  • imagefontheight — Get font height

  • imagefontwidth — Get font width

  • imageftbbox — Give the bounding box of a text using fonts via freetype2

  • imagefttext — Write text to the image using fonts using FreeType 2



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# File 'ext/gd/text.c', line 9

static VALUE gd_image_text(VALUE self, VALUE text, VALUE opts) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  VALUE x = rb_hash_aref(opts, ID2SYM(rb_intern("x")));
  VALUE y = rb_hash_aref(opts, ID2SYM(rb_intern("y")));
  VALUE size = rb_hash_aref(opts, ID2SYM(rb_intern("size")));
  VALUE color = rb_hash_aref(opts, ID2SYM(rb_intern("color")));
  VALUE font = rb_hash_aref(opts, ID2SYM(rb_intern("font")));

  if (NIL_P(x) || NIL_P(y) || NIL_P(size) || NIL_P(color) || NIL_P(font))
    rb_raise(rb_eArgError, "missing options");

  int fg = color_to_gd(wrap->img, color);

  int brect[8];
  char *err = gdImageStringFT(
    wrap->img,
    brect,
    fg,
    StringValueCStr(font),
    NUM2DBL(size),
    0,
    NUM2INT(x),
    NUM2INT(y),
    StringValueCStr(text)
  );

  if (err) rb_raise(rb_eRuntimeError, "%s", err);

  return Qnil;
}

#to_png ⇒ Object 



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# File 'ext/gd/encode.c', line 40

static VALUE gd_image_to_png(VALUE self) {
  gd_image_wrapper *wrap;
  TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);

  int size = 0;
  void *data = gdImagePngPtr(wrap->img, &size);
  if (!data) rb_raise(rb_eRuntimeError, "PNG encode failed");

  VALUE str = rb_str_new((const char*)data, size);
  gdFree(data);
  return str;
}

#width ⇒ Object 



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# File 'ext/gd/image.c', line 192

static VALUE gd_image_width(VALUE self) {
    gd_image_wrapper *wrap;
    TypedData_Get_Struct(self, gd_image_wrapper, &gd_image_type, wrap);
    return INT2NUM(gdImageSX(wrap->img));
}