[ion] linux: enable to use key layouts jpg files in C/C++ code

build/rules.mk

@@ -3,7 +3,7 @@
 $(eval $(call rule_for, \
   AS, %.o, %.s, \
   $$(CC) $$(SFLAGS) -c $$< -o $$@, \
-  global \
+  global local \
 ))
 
 $(eval $(call rule_for, \

ion/src/simulator/linux/Makefile

@@ -10,7 +10,7 @@ SFLAGS += -Iion/src/simulator/linux/include
 ion_src += $(addprefix ion/src/simulator/linux/, \
   images.cpp \
   language.cpp \
-  background.s \
+  assets.s \
 )
 
 ion_src += $(addprefix ion/src/simulator/shared/, \
@@ -26,3 +26,21 @@ ion_src += ion/src/shared/telemetry_console.cpp
 endif
 
 LDFLAGS += -ljpeg
+
+jpg_assets = background horizontal_arrow vertical_arrow round small_squircle large_squircle
+
+jpg_images = $(foreach i,$(jpg_assets),ion/src/simulator/assets/$(i).jpg)
+
+$(eval $(call rule_for, \
+  LINUX_ASSETS, \
+  ion/src/simulator/linux/assets.s, \
+  $(jpg_images), \
+  $$(PYTHON) ion/src/simulator/linux/assets.py --files $(jpg_assets) --implementation $$@, \
+  global \
+))
+
+assets_address_ranges_declaration = $(foreach i,$(jpg_assets),extern unsigned char _ion_simulator_$(i)_start;)
+assets_address_ranges_declaration += $(foreach i,$(jpg_assets),extern unsigned char _ion_simulator_$(i)_end;)
+assets_address_ranges_definition = $(foreach i,$(jpg_assets), {"$(i).jpg", _ion_simulator_$(i)_start, _ion_simulator_$(i)_end},)
+
+$(call object_for,ion/src/simulator/linux/images.cpp): CXXFLAGS += -DASSETS_ADDRESS_RANGES_DECLARATION='$(assets_address_ranges_declaration)' -DASSETS_ADDRESS_RANGES_DEFINITION='$(assets_address_ranges_definition)'

ion/src/simulator/linux/assets.py

@@ -0,0 +1,29 @@
+# This script generates a .s file representing jpg assets in order to access
+# them from C code
+
+import sys
+import re
+import argparse
+import io
+
+parser = argparse.ArgumentParser(description="Process some jpg files.")
+parser.add_argument('--files', nargs='+', help='a list of jpg file names')
+parser.add_argument('--implementation', help='the .s file to generate')
+args = parser.parse_args()
+
+def print_jpg(f, jpg):
+    f.write(".global _ion_simulator_" + jpg + "_start\n")
+    f.write(".global _ion_simulator_" + jpg + "_end\n")
+    f.write("_ion_simulator_" + jpg + "_start:\n")
+    f.write("    .incbin \"ion/src/simulator/assets/" + jpg + ".jpg\"\n")
+    f.write("_ion_simulator_" + jpg + "_end:\n\n")
+
+def print(files, path):
+    f = open(path, "w")
+    for jpg in files:
+        print_jpg(f, jpg)
+
+    f.close()
+
+print(args.files, args.implementation)
+

ion/src/simulator/linux/background.s

@@ -1,5 +0,0 @@
-.global _ion_simulator_background_start
-.global _ion_simulator_background_end
-_ion_simulator_background_start:
-    .incbin "ion/src/simulator/assets/background.jpg"
-_ion_simulator_background_end:

ion/src/simulator/linux/images.cpp

@@ -4,8 +4,18 @@
 #include <jpeglib.h>
 #include <assert.h>
 
-extern unsigned char _ion_simulator_background_start;
-extern unsigned char _ion_simulator_background_end;
+#ifndef ASSETS_ADDRESS_RANGES_DECLARATION
+#error Missing assets adress range declarations
+#endif
+
+ASSETS_ADDRESS_RANGES_DECLARATION
+static struct {
+  const char * identifier;
+  unsigned char start;
+  unsigned char end;
+} resources_addresses[] = {
+  ASSETS_ADDRESS_RANGES_DEFINITION
+};
 
 SDL_Texture * IonSimulatorLoadImage(SDL_Renderer * renderer, const char * identifier) {
   struct jpeg_decompress_struct info;
@@ -14,8 +24,17 @@ SDL_Texture * IonSimulatorLoadImage(SDL_Renderer * renderer, const char * identi
 
   jpeg_create_decompress(&info);
 
-  unsigned char * jpegStart = &_ion_simulator_background_start;
-  unsigned long jpegSize = &_ion_simulator_background_end - &_ion_simulator_background_start;
+  unsigned char * jpegStart = nullptr;
+  unsigned long jpegSize = 0;
+
+  for (size_t i = 0; i < sizeof(resources_addresses)/sizeof(resources_addresses[0]); i++) {
+    if (strcmp(identifier, resources_addresses[i].identifier) == 0) {
+      jpegStart = &resources_addresses[i].start;
+      jpegSize = &resources_addresses[i].end - &resources_addresses[i].start;
+      break;
+    }
+  }
+  assert(jpegStart);
   jpeg_mem_src(&info, jpegStart, jpegSize);
 
   if (jpeg_read_header(&info, TRUE) != 1) {