Make Fl_Image::copy() 'const', including all derived classes

Copying an image does not (and must not) change the original object,
hence copy() should always be 'const'.

This is *necessary* if the given Fl_Image object is 'const'.

4 files changed, 10 insertions, 10 deletions

diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx
index eba5b2001..3ff657b92 100644
--- a/src/Fl_Image.cxx
+++ b/src/Fl_Image.cxx
@@ -88,7 +88,7 @@ void Fl_Image::draw_empty(int X, int Y) {
 
   \param[in] W,H  Requested width and height of the copied image
 */
-Fl_Image *Fl_Image::copy(int W, int H) {
+Fl_Image *Fl_Image::copy(int W, int H) const {
   return new Fl_Image(W, H, d());
 }
 
@@ -401,7 +401,7 @@ void Fl_RGB_Image::uncache() {
   Fl_Graphics_Driver::default_driver().uncache(this, id_, mask_);
 }
 
-Fl_Image *Fl_RGB_Image::copy(int W, int H) {
+Fl_Image *Fl_RGB_Image::copy(int W, int H) const {
   Fl_RGB_Image  *new_image;     // New RGB image
   uchar         *new_array;     // New array for image data
 
diff --git a/src/Fl_SVG_Image.cxx b/src/Fl_SVG_Image.cxx
index 5af4723b3..58dd48b34 100644
--- a/src/Fl_SVG_Image.cxx
+++ b/src/Fl_SVG_Image.cxx
@@ -64,7 +64,7 @@ Fl_SVG_Image::Fl_SVG_Image(const char *filename, const char *svg_data) : Fl_RGB_
 
 
 // private constructor
-Fl_SVG_Image::Fl_SVG_Image(Fl_SVG_Image *source) : Fl_RGB_Image(NULL, 0, 0, 4) {
+Fl_SVG_Image::Fl_SVG_Image(const Fl_SVG_Image *source) : Fl_RGB_Image(NULL, 0, 0, 4) {
   init_(NULL, NULL, source);
 }
 
@@ -124,7 +124,7 @@ static char *svg_inflate(const char *fname) {
 }
 #endif
 
-void Fl_SVG_Image::init_(const char *filename, const char *in_filedata, Fl_SVG_Image *copy_source) {
+void Fl_SVG_Image::init_(const char *filename, const char *in_filedata, const Fl_SVG_Image *copy_source) {
   if (copy_source) {
     filename = in_filedata = NULL;
     counted_svg_image_ = copy_source->counted_svg_image_;
@@ -206,7 +206,7 @@ void Fl_SVG_Image::rasterize_(int W, int H) {
 }
 
 
-Fl_Image *Fl_SVG_Image::copy(int W, int H) {
+Fl_Image *Fl_SVG_Image::copy(int W, int H) const {
   Fl_SVG_Image *svg2 = new Fl_SVG_Image(this);
   svg2->to_desaturate_ = to_desaturate_;
   svg2->average_weight_ = average_weight_;
diff --git a/src/Fl_Shared_Image.cxx b/src/Fl_Shared_Image.cxx
index 8b3a34ded..91e093b6f 100644
--- a/src/Fl_Shared_Image.cxx
+++ b/src/Fl_Shared_Image.cxx
@@ -300,7 +300,7 @@ void Fl_Shared_Image::reload() {
 // For doxygen docs see Fl_Image::copy().
 
 Fl_Image *
-Fl_Shared_Image::copy(int W, int H) {
+Fl_Shared_Image::copy(int W, int H) const {
   Fl_Image              *temp_image;    // New image file
   Fl_Shared_Image       *temp_shared;   // New shared image
 
diff --git a/src/Fl_Tiled_Image.cxx b/src/Fl_Tiled_Image.cxx
index a97081e6a..da1ed5531 100644
--- a/src/Fl_Tiled_Image.cxx
+++ b/src/Fl_Tiled_Image.cxx
@@ -1,7 +1,7 @@
 //
 // Tiled image code for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2020 by Bill Spitzak and others.
+// Copyright 1998-2022 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -77,9 +77,9 @@ Fl_Tiled_Image::Fl_Tiled_Image(Fl_Image *i,     // I - Image to tile
 // 'Fl_Tiled_Image::copy()' - Copy and resize a tiled image...
 //
 
-Fl_Image *                      // O - New image
-Fl_Tiled_Image::copy(int W,     // I - New width
-                     int H) {   // I - New height
+Fl_Image *                            // O - New image
+Fl_Tiled_Image::copy(int W,           // I - New width
+                     int H) const {   // I - New height
   return new Fl_Tiled_Image(image_, W, H);
 }