Remove ignoreGainMap param of avifImageCreateView

Remove the ignoreGainMap parameter of the avifImageCreateView()
function.

All the callers of avifImageCreateView() pass ignoreGainMap=false to the
function. (The only exception is the recursive call on the gain map
image, but the gain map image cannot have its own gain map image, so it
doesn't really matter.)

apps/avifdec.c

diff --git a/apps/avifdec.c b/apps/avifdec.c
index f5e6567..25880ea 100644
--- a/apps/avifdec.c
+++ b/apps/avifdec.c
@@ -417,8 +417,7 @@
             result = avifImageCreateView(imageView,
                                          decoder->image,
                                          /*ignoreColorProfile=*/AVIF_TRUE,
-                                         /*ignoreAlpha=*/AVIF_FALSE,
-                                         /*ignoreGainMap=*/AVIF_FALSE);
+                                         /*ignoreAlpha=*/AVIF_FALSE);
             if (result != AVIF_RESULT_OK) {
                 fprintf(stderr, "ERROR: Failed to create image view\n");
                 goto cleanup;

apps/avifgainmaputil/extractgainmap_command.cc

diff --git a/apps/avifgainmaputil/extractgainmap_command.cc b/apps/avifgainmaputil/extractgainmap_command.cc
index b926296..ccb0da7 100644
--- a/apps/avifgainmaputil/extractgainmap_command.cc
+++ b/apps/avifgainmaputil/extractgainmap_command.cc
@@ -37,8 +37,7 @@
   }
   result = avifImageCreateView(image.get(), decoder->image,
                                /*ignoreColorProfile=*/true,
-                               /*ignoreAlpha=*/false,
-                               /*ignoreGainMap=*/false);
+                               /*ignoreAlpha=*/false);
   if (result != AVIF_RESULT_OK) {
     return result;
   }

apps/avifgainmaputil/imageio.cc

diff --git a/apps/avifgainmaputil/imageio.cc b/apps/avifgainmaputil/imageio.cc
index 25a1b49..329831e 100644
--- a/apps/avifgainmaputil/imageio.cc
+++ b/apps/avifgainmaputil/imageio.cc
@@ -214,10 +214,8 @@
     if (!view) {
       return AVIF_RESULT_OUT_OF_MEMORY;
     }
-    // When ignore_gain_map is true, decoder->image won't have a gain map but
-    // may have gain map metadata. It is fine to copy gain map metadata.
     result = avifImageCreateView(view.get(), decoder->image, ignore_profile,
-                                 ignore_alpha, /*ignoreGainMap=*/false);
+                                 ignore_alpha);
     if (result != AVIF_RESULT_OK) {
       return result;
     }

apps/avifgainmaputil/swapbase_command.cc

diff --git a/apps/avifgainmaputil/swapbase_command.cc b/apps/avifgainmaputil/swapbase_command.cc
index 38a5a7f..3dd6c43 100644
--- a/apps/avifgainmaputil/swapbase_command.cc
+++ b/apps/avifgainmaputil/swapbase_command.cc
@@ -176,8 +176,7 @@
   }
   result = avifImageCreateView(image.get(), decoder->image,
                                arg_image_read_.ignore_profile,
-                               arg_image_read_.ignore_alpha,
-                               /*ignore_gain_map=*/false);
+                               arg_image_read_.ignore_alpha);
   if (result != AVIF_RESULT_OK) {
     return result;
   }

apps/avifgainmaputil/tonemap_command.cc

diff --git a/apps/avifgainmaputil/tonemap_command.cc b/apps/avifgainmaputil/tonemap_command.cc
index 42fe627..8b36c58 100644
--- a/apps/avifgainmaputil/tonemap_command.cc
+++ b/apps/avifgainmaputil/tonemap_command.cc
@@ -78,8 +78,7 @@
   }
   result = avifImageCreateView(image.get(), decoder->image,
                                arg_image_read_.ignore_profile,
-                               arg_image_read_.ignore_alpha,
-                               /*ignore_gain_map=*/false);
+                               arg_image_read_.ignore_alpha);
   if (result != AVIF_RESULT_OK) {
     return result;
   }

apps/shared/avifutil.c

diff --git a/apps/shared/avifutil.c b/apps/shared/avifutil.c
index 2fe63e1..61a6f12 100644
--- a/apps/shared/avifutil.c
+++ b/apps/shared/avifutil.c
@@ -824,7 +824,7 @@
     return AVIF_RESULT_OK;
 }
 
-avifResult avifImageCreateView(avifImage * dstImage, const avifImage * srcImage, avifBool ignoreColorProfile, avifBool ignoreAlpha, avifBool ignoreGainMap)
+avifResult avifImageCreateView(avifImage * dstImage, const avifImage * srcImage, avifBool ignoreColorProfile, avifBool ignoreAlpha)
 {
     avifResult res = AVIF_RESULT_OK;
     if (!dstImage || !srcImage) {
@@ -876,7 +876,7 @@
         }
     }
 
-    if (!ignoreGainMap && srcImage->gainMap) {
+    if (srcImage->gainMap) {
         dstImage->gainMap = avifGainMapCreate();
         if (!dstImage->gainMap) {
             return AVIF_RESULT_OUT_OF_MEMORY;
@@ -904,8 +904,7 @@
             res = avifImageCreateView(dstImage->gainMap->image,
                                       srcImage->gainMap->image,
                                       ignoreColorProfile,
-                                      /*ignoreAlpha=*/AVIF_TRUE,
-                                      /*ignoreGainMap=*/AVIF_TRUE);
+                                      /*ignoreAlpha=*/AVIF_TRUE);
             if (res != AVIF_RESULT_OK) {
                 return res;
             }

apps/shared/avifutil.h

diff --git a/apps/shared/avifutil.h b/apps/shared/avifutil.h
index 30f6996..e99f9d5 100644
--- a/apps/shared/avifutil.h
+++ b/apps/shared/avifutil.h
@@ -132,7 +132,7 @@
 // If a gain map is present in 'srcImage', the gain map of 'dstImage' is also set to
 // a view of the original gain map.
 // 'dstImage' should be an empty image. It will not own the pixel data.
-avifResult avifImageCreateView(avifImage * dstImage, const avifImage * srcImage, avifBool ignoreColorProfile, avifBool ignoreAlpha, avifBool ignoreGainMap);
+avifResult avifImageCreateView(avifImage * dstImage, const avifImage * srcImage, avifBool ignoreColorProfile, avifBool ignoreAlpha);
 
 #ifdef __cplusplus
 } // extern "C"