picture frame graphics

27 files changed, 384 insertions, 56 deletions

diff --git a/.gitignore b/.gitignore
index 175b830fb..05643bb33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@
 *.8bpp
 *.gbapal
 *.lz
+*.rl
 *.latfont
 *.hwjpnfont
 *.fwjpnfont
diff --git a/Makefile b/Makefile
index 90d72096b..b50fbdf65 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,7 @@ PREPROC := tools/preproc/preproc
 # Secondary expansion is required for dependency variables in object rules.
 .SECONDEXPANSION:
 
-.PRECIOUS: %.1bpp %.4bpp %.8bpp %.gbapal %.lz
+.PRECIOUS: %.1bpp %.4bpp %.8bpp %.gbapal %.lz %.rl
 
 .PHONY: all clean compare ruby sapphire
 
@@ -64,7 +64,7 @@ compare: both
 
 clean:
 	rm -f $(ROM) $(ELF) $(OBJS) $(pokeruby_OBJS) $(pokesapphire_OBJS) $(C_SRCS:%.c=%.i) pokeruby.map pokesapphire.map
-	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' \) -exec rm {} +
+	find . \( -iname '*.1bpp' -o -iname '*.4bpp' -o -iname '*.8bpp' -o -iname '*.gbapal' -o -iname '*.lz' -o -iname '*.rl' \) -exec rm {} +
 
 tidy:
 	rm -f $(ROM) $(ELF) $(OBJS) $(pokeruby_OBJS) $(pokesapphire_OBJS) $(C_SRCS:%.c=%.i) pokeruby.map pokesapphire.map
@@ -84,6 +84,7 @@ include misc.mk
 %.8bpp: %.png  ; $(GFX) $< $@
 %.gbapal: %.pal ; $(GFX) $< $@
 %.lz: % ; $(GFX) $< $@
+%.rl: % ; $(GFX) $< $@
 
 src/libc_ruby.o src/libc_sapphire.o: CC1 := tools/agbcc/bin/old_agbcc
 src/libc_ruby.o src/libc_sapphire.o: CFLAGS := -O2
diff --git a/asm/rom5.s b/asm/rom5.s
index 87a4f3086..4ccb19aa0 100644
--- a/asm/rom5.s
+++ b/asm/rom5.s
@@ -287969,7 +287969,7 @@ _08106C5E:
 	ldr r0, [r0]
 	mov pc, r0
 	.align 2, 0
-_08106C7C: .4byte gUnknown_083EF198
+_08106C7C: .4byte gPictureFramePalettes
 _08106C80: .4byte 0x03005e8c
 _08106C84: .4byte _08106C88
 	.align 2, 0
@@ -287987,8 +287987,8 @@ _08106C9C:
 	ldr r0, _08106CB0
 	b _08106CF0
 	.align 2, 0
-_08106CAC: .4byte gUnknown_083EF398
-_08106CB0: .4byte gUnknown_083F4260
+_08106CAC: .4byte gPictureFrameTiles_0
+_08106CB0: .4byte gPictureFrameTilemap_0
 _08106CB4:
 	ldr r0, _08106CC4
 	movs r1, 0xC0
@@ -287997,8 +287997,8 @@ _08106CB4:
 	ldr r0, _08106CC8
 	b _08106CF0
 	.align 2, 0
-_08106CC4: .4byte gUnknown_083F041C
-_08106CC8: .4byte gUnknown_083F476C
+_08106CC4: .4byte gPictureFrameTiles_1
+_08106CC8: .4byte gPictureFrameTilemap_1
 _08106CCC:
 	ldr r0, _08106CDC
 	movs r1, 0xC0
@@ -288007,8 +288007,8 @@ _08106CCC:
 	ldr r0, _08106CE0
 	b _08106CF0
 	.align 2, 0
-_08106CDC: .4byte gUnknown_083F104C
-_08106CE0: .4byte gUnknown_083F4C78
+_08106CDC: .4byte gPictureFrameTiles_2
+_08106CE0: .4byte gPictureFrameTilemap_2
 _08106CE4:
 	ldr r0, _08106CFC
 	movs r1, 0xC0
@@ -288021,8 +288021,8 @@ _08106CF0:
 	bl RLUnCompWram
 	b _08106D1C
 	.align 2, 0
-_08106CFC: .4byte gUnknown_083F1B84
-_08106D00: .4byte gUnknown_083F5184
+_08106CFC: .4byte gPictureFrameTiles_3
+_08106D00: .4byte gPictureFrameTilemap_3
 _08106D04: .4byte 0x03005e10
 _08106D08:
 	ldr r0, _08106D98
@@ -288102,8 +288102,8 @@ _08106D80:
 	bls _08106D80
 	b _08106E86
 	.align 2, 0
-_08106D98: .4byte gUnknown_083F2B3C
-_08106D9C: .4byte gUnknown_083F5690
+_08106D98: .4byte gPictureFrameTiles_4
+_08106D9C: .4byte gPictureFrameTilemap_4
 _08106DA0: .4byte 0x03005e10
 _08106DA4: .4byte 0x06006000
 _08106DA8: .4byte 0x00001015
@@ -288119,8 +288119,8 @@ _08106DB4:
 	ldr r0, _08106DCC
 	b _08106E60
 	.align 2, 0
-_08106DC8: .4byte gUnknown_083F3C6C
-_08106DCC: .4byte gUnknown_083F5B9C
+_08106DC8: .4byte gPictureFrameTiles_5
+_08106DCC: .4byte gPictureFrameTilemap_5
 _08106DD0:
 	ldr r0, _08106DF0
 	ldr r0, [r0]
@@ -288154,8 +288154,8 @@ _08106E0C:
 	ldr r0, _08106E20
 	b _08106E60
 	.align 2, 0
-_08106E1C: .4byte gUnknown_083EF398
-_08106E20: .4byte gUnknown_083F4260
+_08106E1C: .4byte gPictureFrameTiles_0
+_08106E20: .4byte gPictureFrameTilemap_0
 _08106E24:
 	ldr r0, _08106E34
 	movs r1, 0xC0
@@ -288164,8 +288164,8 @@ _08106E24:
 	ldr r0, _08106E38
 	b _08106E60
 	.align 2, 0
-_08106E34: .4byte gUnknown_083F041C
-_08106E38: .4byte gUnknown_083F476C
+_08106E34: .4byte gPictureFrameTiles_1
+_08106E38: .4byte gPictureFrameTilemap_1
 _08106E3C:
 	ldr r0, _08106E4C
 	movs r1, 0xC0
@@ -288174,8 +288174,8 @@ _08106E3C:
 	ldr r0, _08106E50
 	b _08106E60
 	.align 2, 0
-_08106E4C: .4byte gUnknown_083F104C
-_08106E50: .4byte gUnknown_083F4C78
+_08106E4C: .4byte gPictureFrameTiles_2
+_08106E50: .4byte gPictureFrameTilemap_2
 _08106E54:
 	ldr r0, _08106E68
 	movs r1, 0xC0
@@ -288187,8 +288187,8 @@ _08106E60:
 	bl RLUnCompVram
 	b _08106E86
 	.align 2, 0
-_08106E68: .4byte gUnknown_083F1B84
-_08106E6C: .4byte gUnknown_083F5184
+_08106E68: .4byte gPictureFrameTiles_3
+_08106E6C: .4byte gPictureFrameTilemap_3
 _08106E70: .4byte 0x06006000
 _08106E74:
 	ldr r0, _08106E8C
@@ -288203,8 +288203,8 @@ _08106E86:
 	pop {r0}
 	bx r0
 	.align 2, 0
-_08106E8C: .4byte gUnknown_083F2B3C
-_08106E90: .4byte gUnknown_083F5690
+_08106E8C: .4byte gPictureFrameTiles_4
+_08106E90: .4byte gPictureFrameTilemap_4
 _08106E94: .4byte 0x06006000
 	thumb_func_end sub_8106C40
 
@@ -288240,7 +288240,7 @@ sub_8106E98: @ 8106E98
 	bx r0
 	.align 2, 0
 _08106ED0: .4byte 0x03001770
-_08106ED4: .4byte gUnknown_083F6138
+_08106ED4: .4byte gOamData_83F6138
 _08106ED8: .4byte 0xfffffc00
 _08106EDC: .4byte 0xfffffe00
 	thumb_func_end sub_8106E98
diff --git a/data/data2.s b/data/data2.s
index 41c0fdcc8..75d1a4b85 100644
--- a/data/data2.s
+++ b/data/data2.s
@@ -21370,44 +21370,63 @@ gUnknown_083EDE8C:: @ 83EDE8C
 gUnknown_083EEFE0:: @ 83EEFE0
 	.incbin "baserom.gba", 0x003eefe0, 0x1b8
 
-gUnknown_083EF198:: @ 83EF198
-	.incbin "baserom.gba", 0x003ef198, 0x200
+	.align 2
+gPictureFramePalettes:: @ 83EF198
+	.incbin "graphics/picture_frame/bg0.gbapal"
+	.incbin "graphics/picture_frame/bg1.gbapal"
+	.incbin "graphics/picture_frame/bg2.gbapal"
+	.incbin "graphics/picture_frame/bg3.gbapal"
+	.incbin "graphics/picture_frame/bg4.gbapal"
+	.incbin "graphics/picture_frame/bg5.gbapal"
+	.space 10 * 32
 
-gUnknown_083EF398:: @ 83EF398
-	.incbin "baserom.gba", 0x003ef398, 0x1084
+	.align 2
+gPictureFrameTiles_0:: @ 83EF398
+	.incbin "graphics/picture_frame/frame0.4bpp.rl"
 
-gUnknown_083F041C:: @ 83F041C
-	.incbin "baserom.gba", 0x003f041c, 0xc30
+	.align 2
+gPictureFrameTiles_1:: @ 83F041C
+	.incbin "graphics/picture_frame/frame1.4bpp.rl"
 
-gUnknown_083F104C:: @ 83F104C
-	.incbin "baserom.gba", 0x003f104c, 0xb38
+	.align 2
+gPictureFrameTiles_2:: @ 83F104C
+	.incbin "graphics/picture_frame/frame2.4bpp.rl"
 
-gUnknown_083F1B84:: @ 83F1B84
-	.incbin "baserom.gba", 0x003f1b84, 0xfb8
+	.align 2
+gPictureFrameTiles_3:: @ 83F1B84
+	.incbin "graphics/picture_frame/frame3.4bpp.rl"
 
-gUnknown_083F2B3C:: @ 83F2B3C
-	.incbin "baserom.gba", 0x003f2b3c, 0x1130
+	.align 2
+gPictureFrameTiles_4:: @ 83F2B3C
+	.incbin "graphics/picture_frame/frame4.4bpp.rl"
 
-gUnknown_083F3C6C:: @ 83F3C6C
-	.incbin "baserom.gba", 0x003f3c6c, 0x5f4
+	.align 2
+gPictureFrameTiles_5:: @ 83F3C6C
+	.incbin "graphics/picture_frame/frame5.4bpp.rl"
 
-gUnknown_083F4260:: @ 83F4260
-	.incbin "baserom.gba", 0x003f4260, 0x50c
+	.align 2
+gPictureFrameTilemap_0:: @ 83F4260
+	.incbin "graphics/picture_frame/frame0_map.bin.rl"
 
-gUnknown_083F476C:: @ 83F476C
-	.incbin "baserom.gba", 0x003f476c, 0x50c
+	.align 2
+gPictureFrameTilemap_1:: @ 83F476C
+	.incbin "graphics/picture_frame/frame1_map.bin.rl"
 
-gUnknown_083F4C78:: @ 83F4C78
-	.incbin "baserom.gba", 0x003f4c78, 0x50c
+	.align 2
+gPictureFrameTilemap_2:: @ 83F4C78
+	.incbin "graphics/picture_frame/frame2_map.bin.rl"
 
-gUnknown_083F5184:: @ 83F5184
-	.incbin "baserom.gba", 0x003f5184, 0x50c
+	.align 2
+gPictureFrameTilemap_3:: @ 83F5184
+	.incbin "graphics/picture_frame/frame3_map.bin.rl"
 
-gUnknown_083F5690:: @ 83F5690
-	.incbin "baserom.gba", 0x003f5690, 0x50c
+	.align 2
+gPictureFrameTilemap_4:: @ 83F5690
+	.incbin "graphics/picture_frame/frame4_map.bin.rl"
 
-gUnknown_083F5B9C:: @ 83F5B9C
-	.incbin "baserom.gba", 0x003f5b9c, 0x510
+	.align 2
+gPictureFrameTilemap_5:: @ 83F5B9C
+	.incbin "graphics/picture_frame/frame5_map.bin.rl"
 
 	.align 2
 gUnknown_083F60AC:: @ 83F60AC
@@ -21450,9 +21469,13 @@ gUnknown_083F60C0:: @ 83F60C0
 	.4byte OtherText_MightyTough
 	.4byte OtherText_Exclamation
 
-gUnknown_083F6138:: @ 83F6138
-	.incbin "baserom.gba", 0x003f6138, 0x8
+	.align 2
+gOamData_83F6138:: @ 83F6138
+	.2byte 0x3000
+	.2byte 0xC000
+	.2byte 0x0000
 
+	.align 2
 gUnknown_083F6140:: @ 83F6140
 	.space 4
 
diff --git a/graphics/picture_frame/bg0.pal b/graphics/picture_frame/bg0.pal
new file mode 100644
index 000000000..92d91c1a2
--- /dev/null
+++ b/graphics/picture_frame/bg0.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+255 255 255
+230 230 230
+213 213 213
+197 197 197
+180 180 180
+164 164 164
+148 148 148
+131 131 131
+115 115 115
+98 98 98
+82 82 82
+65 65 65
+49 49 49
+32 32 32
+16 16 16
diff --git a/graphics/picture_frame/bg1.pal b/graphics/picture_frame/bg1.pal
new file mode 100644
index 000000000..b62154cd1
--- /dev/null
+++ b/graphics/picture_frame/bg1.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+90 24 0
+139 65 16
+164 90 16
+189 115 16
+222 148 49
+255 180 82
+255 222 131
+98 172 115
+148 197 156
+222 255 230
+255 255 255
+205 189 164
+180 164 139
+164 139 115
+131 98 74
diff --git a/graphics/picture_frame/bg2.pal b/graphics/picture_frame/bg2.pal
new file mode 100644
index 000000000..9aba35b7a
--- /dev/null
+++ b/graphics/picture_frame/bg2.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+180 148 213
+180 164 197
+180 189 189
+180 205 180
+180 230 172
+189 255 164
+222 255 139
+246 238 123
+255 230 98
+255 205 139
+255 180 139
+238 164 189
+205 156 197
+255 246 255
+90 57 74
diff --git a/graphics/picture_frame/bg3.pal b/graphics/picture_frame/bg3.pal
new file mode 100644
index 000000000..aa33d2f8d
--- /dev/null
+++ b/graphics/picture_frame/bg3.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+255 123 164
+255 139 180
+255 180 205
+255 213 255
+255 205 0
+255 213 57
+255 230 123
+255 238 189
+255 255 255
+90 24 0
+139 65 16
+205 189 164
+180 164 139
+164 139 115
+131 98 74
diff --git a/graphics/picture_frame/bg4.pal b/graphics/picture_frame/bg4.pal
new file mode 100644
index 000000000..9e6bd9116
--- /dev/null
+++ b/graphics/picture_frame/bg4.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+90 24 0
+139 65 16
+222 148 49
+255 222 131
+131 131 131
+65 65 65
+255 0 0
+255 82 82
+255 164 164
+255 98 197
+255 148 213
+255 197 230
+74 255 90
+131 255 139
+189 255 197
diff --git a/graphics/picture_frame/bg5.pal b/graphics/picture_frame/bg5.pal
new file mode 100644
index 000000000..d03ae085b
--- /dev/null
+++ b/graphics/picture_frame/bg5.pal
@@ -0,0 +1,19 @@
+JASC-PAL
+0100
+16
+0 0 0
+90 24 0
+139 65 16
+222 148 49
+255 222 131
+131 131 131
+65 65 65
+74 148 238
+131 180 238
+189 213 246
+74 255 90
+131 255 139
+189 255 197
+255 255 0
+255 255 123
+0 0 0
diff --git a/graphics/picture_frame/frame0.png b/graphics/picture_frame/frame0.png
new file mode 100644
index 000000000..33f2baf09
--- /dev/null
+++ b/graphics/picture_frame/frame0.png
diff --git a/graphics/picture_frame/frame0_map.bin b/graphics/picture_frame/frame0_map.bin
new file mode 100644
index 000000000..6f7a7b165
--- /dev/null
+++ b/graphics/picture_frame/frame0_map.bin
diff --git a/graphics/picture_frame/frame1.png b/graphics/picture_frame/frame1.png
new file mode 100644
index 000000000..72e9d0ab7
--- /dev/null
+++ b/graphics/picture_frame/frame1.png
diff --git a/graphics/picture_frame/frame1_map.bin b/graphics/picture_frame/frame1_map.bin
new file mode 100644
index 000000000..523ff9e28
--- /dev/null
+++ b/graphics/picture_frame/frame1_map.bin
diff --git a/graphics/picture_frame/frame2.png b/graphics/picture_frame/frame2.png
new file mode 100644
index 000000000..38e6ba209
--- /dev/null
+++ b/graphics/picture_frame/frame2.png
diff --git a/graphics/picture_frame/frame2_map.bin b/graphics/picture_frame/frame2_map.bin
new file mode 100644
index 000000000..3333c2a01
--- /dev/null
+++ b/graphics/picture_frame/frame2_map.bin
diff --git a/graphics/picture_frame/frame3.png b/graphics/picture_frame/frame3.png
new file mode 100644
index 000000000..93fbf373f
--- /dev/null
+++ b/graphics/picture_frame/frame3.png
diff --git a/graphics/picture_frame/frame3_map.bin b/graphics/picture_frame/frame3_map.bin
new file mode 100644
index 000000000..c2adf40c2
--- /dev/null
+++ b/graphics/picture_frame/frame3_map.bin
diff --git a/graphics/picture_frame/frame4.png b/graphics/picture_frame/frame4.png
new file mode 100644
index 000000000..c7db2e3be
--- /dev/null
+++ b/graphics/picture_frame/frame4.png
diff --git a/graphics/picture_frame/frame4_map.bin b/graphics/picture_frame/frame4_map.bin
new file mode 100644
index 000000000..c2adf40c2
--- /dev/null
+++ b/graphics/picture_frame/frame4_map.bin
diff --git a/graphics/picture_frame/frame5.png b/graphics/picture_frame/frame5.png
new file mode 100644
index 000000000..4608f55e6
--- /dev/null
+++ b/graphics/picture_frame/frame5.png
diff --git a/graphics/picture_frame/frame5_map.bin b/graphics/picture_frame/frame5_map.bin
new file mode 100644
index 000000000..84309ca3d
--- /dev/null
+++ b/graphics/picture_frame/frame5_map.bin
diff --git a/misc.mk b/misc.mk
index f265b7de0..6d46c6879 100755
--- a/misc.mk
+++ b/misc.mk
@@ -7,6 +7,7 @@ UNKNOWNGFXDIR := graphics/unknown
 REELGFXDIR := graphics/slot_machine
 ROULGFXDIR := graphics/roulette
 BTLANMSPRGFXDIR := graphics/battle_anims/sprites
+PICFRAMEGFXDIR := graphics/picture_frame
 
 $(MENUGFXDIR)/menu.gbapal: $(MENUGFXDIR)/menu_0.gbapal $(MENUGFXDIR)/menu_1.gbapal
 
@@ -157,3 +158,6 @@ $(BTLANMSPRGFXDIR)/141.4bpp: $(BTLANMSPRGFXDIR)/141_0.4bpp $(BTLANMSPRGFXDIR)/14
 
 $(BTLANMSPRGFXDIR)/159.4bpp: $(BTLANMSPRGFXDIR)/159_0.4bpp $(BTLANMSPRGFXDIR)/159_1.4bpp
 	@cat $(BTLANMSPRGFXDIR)/159_0.4bpp $(BTLANMSPRGFXDIR)/159_1.4bpp >$@
+
+$(PICFRAMEGFXDIR)/frame5.4bpp: $(PICFRAMEGFXDIR)/frame5.png
+	$(GFX) $< $@ -num_tiles 86
diff --git a/tools/gbagfx/Makefile b/tools/gbagfx/Makefile
index 6c8e5e1fa..de4ea5c42 100644
--- a/tools/gbagfx/Makefile
+++ b/tools/gbagfx/Makefile
@@ -4,11 +4,11 @@ CFLAGS = -Wall -Wextra -std=c11 -O2 -DPNG_SKIP_SETJMP_CHECK
 
 LIBS = -lpng -lz
 
-SRCS = main.c convert_png.c gfx.c jasc_pal.c lz.c util.c font.c
+SRCS = main.c convert_png.c gfx.c jasc_pal.c lz.c rl.c util.c font.c
 
 .PHONY: clean
 
-gbagfx: $(SRCS) convert_png.h gfx.h global.h jasc_pal.h lz.h util.h font.h
+gbagfx: $(SRCS) convert_png.h gfx.h global.h jasc_pal.h lz.h rl.h util.h font.h
 	$(CC) $(CFLAGS) $(SRCS) -o $@ $(LIBS)
 
 clean:
diff --git a/tools/gbagfx/main.c b/tools/gbagfx/main.c
index e33e061b2..54a3c600d 100644
--- a/tools/gbagfx/main.c
+++ b/tools/gbagfx/main.c
@@ -9,6 +9,7 @@
 #include "convert_png.h"
 #include "jasc_pal.h"
 #include "lz.h"
+#include "rl.h"
 #include "font.h"
 
 struct CommandHandler
@@ -289,6 +290,36 @@ void HandleLZDecompressCommand(char *inputPath, char *outputPath, int argc UNUSE
 	free(uncompressedData);
 }
 
+void HandleRLCompressCommand(char *inputPath, char *outputPath, int argc UNUSED, char **argv UNUSED)
+{
+    int fileSize;
+    unsigned char *buffer = ReadWholeFile(inputPath, &fileSize);
+
+    int compressedSize;
+    unsigned char *compressedData = RLCompress(buffer, fileSize, &compressedSize);
+
+    free(buffer);
+
+    WriteWholeFile(outputPath, compressedData, compressedSize);
+
+    free(compressedData);
+}
+
+void HandleRLDecompressCommand(char *inputPath, char *outputPath, int argc UNUSED, char **argv UNUSED)
+{
+    int fileSize;
+    unsigned char *buffer = ReadWholeFile(inputPath, &fileSize);
+
+    int uncompressedSize;
+    unsigned char *uncompressedData = RLDecompress(buffer, fileSize, &uncompressedSize);
+
+    free(buffer);
+
+    WriteWholeFile(outputPath, uncompressedData, uncompressedSize);
+
+    free(uncompressedData);
+}
+
 int main(int argc, char **argv)
 {
 	if (argc < 3)
@@ -312,6 +343,8 @@ int main(int argc, char **argv)
 		{ "png", "fwjpnfont", HandlePngToFullwidthJapaneseFontCommand },
 		{ NULL, "lz", HandleLZCompressCommand },
 		{ "lz", NULL, HandleLZDecompressCommand },
+        { NULL, "rl", HandleRLCompressCommand },
+        { "rl", NULL, HandleRLDecompressCommand },
 		{ NULL, NULL, NULL }
 	};
 
diff --git a/tools/gbagfx/rl.c b/tools/gbagfx/rl.c
new file mode 100644
index 000000000..e90ad808b
--- /dev/null
+++ b/tools/gbagfx/rl.c
@@ -0,0 +1,143 @@
+// Copyright (c) 2016 YamaArashi
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include "global.h"
+#include "rl.h"
+
+unsigned char *RLDecompress(unsigned char *src, int srcSize, int *uncompressedSize)
+{
+    if (srcSize < 4)
+        goto fail;
+
+    int destSize = (src[3] << 16) | (src[2] << 8) | src[1];
+
+    unsigned char *dest = malloc(destSize);
+
+    if (dest == NULL)
+        goto fail;
+
+    int srcPos = 4;
+    int destPos = 0;
+
+    for (;;)
+    {
+        if (srcPos >= srcSize)
+            goto fail;
+
+        unsigned char flags = src[srcPos++];
+        bool compressed = ((flags & 0x80) != 0);
+
+        if (compressed)
+        {
+            int length = (flags & 0x7F) + 3;
+            unsigned char data = src[srcPos++];
+
+            for (int i = 0; i < length; i++)
+                dest[destPos++] = data;
+        }
+        else
+        {
+            int length = (flags & 0x7F) + 1;
+
+            for (int i = 0; i < length; i++)
+                dest[destPos++] = src[srcPos++];
+        }
+
+        if (destPos == destSize)
+        {
+            *uncompressedSize = destSize;
+            return dest;
+        }
+    }
+
+fail:
+    FATAL_ERROR("Fatal error while decompressing RL file.\n");
+}
+
+unsigned char *RLCompress(unsigned char *src, int srcSize, int *compressedSize)
+{
+    if (srcSize <= 0)
+        goto fail;
+
+    int worstCaseDestSize = 4 + srcSize * 2;
+
+    // Round up to the next multiple of four.
+    worstCaseDestSize = (worstCaseDestSize + 3) & ~3;
+
+    unsigned char *dest = malloc(worstCaseDestSize);
+
+    if (dest == NULL)
+        goto fail;
+
+    // header
+    dest[0] = 0x30; // RL compression type
+    dest[1] = (unsigned char)srcSize;
+    dest[2] = (unsigned char)(srcSize >> 8);
+    dest[3] = (unsigned char)(srcSize >> 16);
+
+    int srcPos = 0;
+    int destPos = 4;
+
+    for (;;)
+    {
+        bool compress = false;
+        int uncompressedStart = srcPos;
+        int uncompressedLength = 0;
+
+        while (srcPos < srcSize && uncompressedLength < (0x7F + 1))
+        {
+            compress = (srcPos + 2 < srcSize && src[srcPos] == src[srcPos + 1] && src[srcPos] == src[srcPos + 2]);
+
+            if (compress)
+                break;
+
+            srcPos++;
+            uncompressedLength++;
+        }
+        
+        if (uncompressedLength > 0)
+        {
+            dest[destPos++] = uncompressedLength - 1;
+
+            for (int i = 0; i < uncompressedLength; i++)
+                dest[destPos++] = src[uncompressedStart + i];
+        }
+
+        if (compress)
+        {
+            unsigned char data = src[srcPos];
+            int compressedLength = 0;
+
+            while (compressedLength < (0x7F + 3)
+                && srcPos + compressedLength < srcSize
+                && src[srcPos + compressedLength] == data)
+            {
+                compressedLength++;
+            }
+
+            dest[destPos++] = 0x80 | (compressedLength - 3);
+            dest[destPos++] = data;
+
+            srcPos += compressedLength;
+        }
+
+        if (srcPos == srcSize)
+        {
+            // Pad to multiple of 4 bytes.
+            int remainder = destPos % 4;
+
+            if (remainder != 0)
+            {
+                for (int i = 0; i < 4 - remainder; i++)
+                    dest[destPos++] = 0;
+            }
+
+            *compressedSize = destPos;
+            return dest;
+        }
+    }
+
+fail:
+    FATAL_ERROR("Fatal error while compressing RL file.\n");
+}
diff --git a/tools/gbagfx/rl.h b/tools/gbagfx/rl.h
new file mode 100644
index 000000000..02ad8d6d3
--- /dev/null
+++ b/tools/gbagfx/rl.h
@@ -0,0 +1,9 @@
+// Copyright (c) 2016 YamaArashi
+
+#ifndef RL_H
+#define RL_H
+
+unsigned char *RLDecompress(unsigned char *src, int srcSize, int *uncompressedSize);
+unsigned char *RLCompress(unsigned char *src, int srcSize, int *compressedSize);
+
+#endif // RL_H