Merge pull request #24 from G-e-n-e-v-e-n-s-i-S/resize_image

Add resize_image script function

doc/function/index.txt

@@ -86,6 +86,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:saturate]]		Saturate/desaturate an image.
 | [[fun:invert_image]]		Invert the colors of an image.
 | [[fun:recolor_image]]		Change the colors of an image to match the font color.
+| [[fun:resize_image]]		Stretch or squeeze an image to a given height and width.
 | [[fun:enlarge]]		Enlarge an image by putting a border around it.
 | [[fun:crop]]			Crop an image, giving only a small subset of it.
 | [[fun:flip_horizontal]]	Flip an image horizontally.

doc/function/resize_image.txt

@@ -0,0 +1,14 @@
+Function: resize_image
+
+--Usage--
+> resize_image(input: image, height: height_of_new_image, width: width_of_new_image)
+
+Shrink or grow an image to a new size specified in the parameters, so it can be further worked on.
+If you want to display an image in a field, MSE will automatically resize it to fit the field, you do not need to use this function.
+
+--Parameters--
+! Parameter		Type				Description
+| @input@		[[type:image]]		Image to resize
+| @height@		[[type:int]]		Height of the resulting image
+| @width@		[[type:int]]		Width of the resulting image
+

src/gfx/generated_image.cpp

@@ -304,6 +304,19 @@ bool EnlargeImage::operator == (const GeneratedImage& that) const {
                && border_size == that2->border_size;
 }
 
+// ----------------------------------------------------------------------------- : ResizeImage
+
+Image ResizeImage::generate(const Options& opt) const {
+  Image img = image->generate(opt);
+  return resample(img, width, height);
+}
+bool ResizeImage::operator == (const GeneratedImage& that) const {
+  const ResizeImage* that2 = dynamic_cast<const ResizeImage*>(&that);
+  return that2 && *image == *that2->image
+    && width == that2->width
+    && height == that2->height;
+}
+
 // ----------------------------------------------------------------------------- : CropImage
 
 Image CropImage::generate(const Options& opt) const {

src/gfx/generated_image.hpp

@@ -287,6 +287,21 @@ private:
   double border_size;
 };
 
+// ----------------------------------------------------------------------------- : ResizeImage
+
+/// Resize an image by resampling it
+class ResizeImage : public SimpleFilterImage {
+public:
+    inline ResizeImage(const GeneratedImageP& image, int width, int height)
+        : SimpleFilterImage(image), width(max(1, width)), height(max(1, height))
+    {}
+    Image generate(const Options& opt) const override;
+    bool operator == (const GeneratedImage& that) const override;
+private:
+    int width;
+    int height;
+};
+
 // ----------------------------------------------------------------------------- : CropImage
 
 /// Crop an image at a certain point, to a certain size

src/script/functions/image.cpp

@@ -134,6 +134,13 @@ SCRIPT_FUNCTION(enlarge) {
   return make_intrusive<EnlargeImage>(input, border_size);
 }
 
+SCRIPT_FUNCTION(resize_image) {
+  SCRIPT_PARAM_C(GeneratedImageP, input);
+  SCRIPT_PARAM(int, width);
+  SCRIPT_PARAM(int, height);
+  return make_intrusive<ResizeImage>(input, width, height);
+}
+
 SCRIPT_FUNCTION(crop) {
   SCRIPT_PARAM_C(GeneratedImageP, input);
   SCRIPT_PARAM(int, width);
@@ -253,6 +260,7 @@ void init_script_image_functions(Context& ctx) {
   ctx.setVariable(_("invert_image"),     script_invert_image);
   ctx.setVariable(_("recolor_image"),    script_recolor_image);
   ctx.setVariable(_("enlarge"),          script_enlarge);
+  ctx.setVariable(_("resize_image"),     script_resize_image);
   ctx.setVariable(_("crop"),             script_crop);
   ctx.setVariable(_("flip_horizontal"),  script_flip_horizontal);
   ctx.setVariable(_("flip_vertical"),    script_flip_vertical);

tools/website/drupal/mse-drupal-modules/highlight.inc

@@ -81,6 +81,7 @@ $built_in_functions = array(
 	'saturate'		=>'',
 	'invert_image'		=>'',
 	'recolor_image'		=>'',
+	'resize_image'		=>'',
 	'enlarge'		=>'',
 	'crop'			=>'',
 	'flip_horizontal'	=>'',