Implement better preview for bitmap visualisation (#263).

This replaces the native preview bitmap with a custom renderer that
allows us to render only the visible preview area on demand, working
around a crash on Linux and improving performance.

See also wxWidgets/wxWidgets#25656

Author: solemnwarning

CHANGES.txt

@@ -11,6 +11,10 @@ Version TBC:
 
  * Add search history to text search dialog (#260).
 
+ * Work around crash with large bitmap previews on Linux (#263).
+
+ * Improve performance of bitmap visualisation.
+
 Version 0.63.2 (2025-07-13):
 
  * Add missing file required for binary template support.

Makefile

@@ -438,6 +438,7 @@ APP_OBJS := \
 	src/MultiSplitter.$(BUILD_TYPE).o \
 	src/Palette.$(BUILD_TYPE).o \
 	src/PopupTipWindow.$(BUILD_TYPE).o \
+	src/ProceduralBitmap.$(BUILD_TYPE).o \
 	src/profile.$(BUILD_TYPE).o \
 	src/RangeChoiceLinear.$(BUILD_TYPE).o \
 	src/RangeDialog.$(BUILD_TYPE).o \
@@ -561,6 +562,7 @@ TEST_OBJS := \
 	src/MultiSplitter.$(BUILD_TYPE).o \
 	src/Palette.$(BUILD_TYPE).o \
 	src/PopupTipWindow.$(BUILD_TYPE).o \
+	src/ProceduralBitmap.$(BUILD_TYPE).o \
 	src/RangeDialog.$(BUILD_TYPE).o \
 	src/RangeProcessor.$(BUILD_TYPE).o \
 	src/search.$(BUILD_TYPE).o \

msvc/all-tests/all-tests.vcxproj

@@ -302,6 +302,7 @@
     <ClCompile Include="..\..\src\MultiSplitter.cpp" />
     <ClCompile Include="..\..\src\Palette.cpp" />
     <ClCompile Include="..\..\src\PopupTipWindow.cpp" />
+    <ClCompile Include="..\..\src\ProceduralBitmap.cpp" />
     <ClCompile Include="..\..\src\RangeDialog.cpp" />
     <ClCompile Include="..\..\src\RangeProcessor.cpp" />
     <ClCompile Include="..\..\src\search.cpp" />

msvc/all-tests/all-tests.vcxproj.filters

@@ -466,6 +466,9 @@
     <ClCompile Include="..\..\src\PopupTipWindow.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\ProceduralBitmap.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\src\MultiSplitter.cpp">
       <Filter>src</Filter>
     </ClCompile>

msvc/rehex.vcxproj

@@ -514,6 +514,7 @@
     <ClCompile Include="..\src\MultiSplitter.cpp" />
     <ClCompile Include="..\src\Palette.cpp" />
     <ClCompile Include="..\src\PopupTipWindow.cpp" />
+    <ClCompile Include="..\src\ProceduralBitmap.cpp" />
     <ClCompile Include="..\src\profile.cpp" />
     <ClCompile Include="..\src\RangeChoiceLinear.cpp" />
     <ClCompile Include="..\src\RangeDialog.cpp" />

msvc/rehex.vcxproj.filters

@@ -249,6 +249,9 @@
     <ClCompile Include="..\src\profile.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\ProceduralBitmap.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
     <ClCompile Include="..\src\BitEditor.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>