move heifio decoder stub functions into heifio

examples/heif_enc.cc

@@ -41,18 +41,9 @@
 #include <libheif/heif_properties.h>
 #include "libheif/heif_items.h"
 
-#if HAVE_LIBJPEG
 #include "heifio/decoder_jpeg.h"
-#endif
-
-#if HAVE_LIBPNG
 #include "heifio/decoder_png.h"
-#endif
-
-#if HAVE_LIBTIFF
 #include "heifio/decoder_tiff.h"
-#endif
-
 #include "heifio/decoder_y4m.h"
 
 #include "benchmark.h"
@@ -194,42 +185,6 @@ void show_help(const char* argv0)
 }
 
 
-#if !HAVE_LIBJPEG
-heif_error loadJPEG(const char *filename, InputImage *input_image)
-{
-  struct heif_error err = {
-      .code = heif_error_Unsupported_feature,
-      .subcode = heif_suberror_Unspecified,
-      .message = "Cannot load JPEG because libjpeg support was not compiled."};
-  return err;
-}
-#endif
-
-
-#if !HAVE_LIBPNG
-heif_error loadPNG(const char* filename, int output_bit_depth, InputImage *input_image)
-{
-  struct heif_error err = {
-      .code = heif_error_Unsupported_feature,
-      .subcode = heif_suberror_Unspecified,
-      .message = "Cannot load PNG because libpng support was not compiled."};
-  return err;
-}
-#endif
-
-
-#if !HAVE_LIBTIFF
-heif_error loadTIFF(const char *filename, InputImage *input_image)
-{
-  struct heif_error err = {
-      .code = heif_error_Unsupported_feature,
-      .subcode = heif_suberror_Unspecified,
-      .message = "Cannot load TIFF because libtiff support was not compiled."};
-  return err;
-}
-#endif
-
-
 void list_encoder_parameters(heif_encoder* encoder)
 {
   std::cerr << "Parameters for encoder `" << heif_encoder_get_name(encoder) << "`:\n";

heifio/CMakeLists.txt

@@ -10,7 +10,8 @@ add_library(heifio STATIC
         encoder_y4m.h
         encoder_y4m.cc
         exif.h
-        exif.cc)
+        exif.cc
+        stubs.cc)
 
 target_link_libraries(heifio PRIVATE heif)
 

heifio/stubs.cc

@@ -0,0 +1,60 @@
+/*
+  libheif example application "heif".
+
+  MIT License
+
+  Copyright (c) 2024 Dirk Farin <[email protected]>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+
+#if !HAVE_LIBJPEG
+heif_error loadJPEG(const char *filename, InputImage *input_image)
+{
+  struct heif_error err = {
+      .code = heif_error_Unsupported_feature,
+      .subcode = heif_suberror_Unspecified,
+      .message = "Cannot load JPEG because libjpeg support was not compiled."};
+  return err;
+}
+#endif
+
+
+#if !HAVE_LIBPNG
+heif_error loadPNG(const char* filename, int output_bit_depth, InputImage *input_image)
+{
+  struct heif_error err = {
+      .code = heif_error_Unsupported_feature,
+      .subcode = heif_suberror_Unspecified,
+      .message = "Cannot load PNG because libpng support was not compiled."};
+  return err;
+}
+#endif
+
+
+#if !HAVE_LIBTIFF
+heif_error loadTIFF(const char *filename, InputImage *input_image)
+{
+  struct heif_error err = {
+      .code = heif_error_Unsupported_feature,
+      .subcode = heif_suberror_Unspecified,
+      .message = "Cannot load TIFF because libtiff support was not compiled."};
+  return err;
+}
+#endif