use ptrdiff_t to represent pitch

libgambatte/include/gambatte.h

@@ -21,6 +21,7 @@
 
 #include "gbint.h"
 #include "loadres.h"
+#include <cstddef>
 #include <string>
 #include <sstream>
 #include <cstdint>
@@ -88,7 +89,7 @@ public:
 	  */
 	long runFor(gambatte::uint_least32_t *soundBuf, unsigned &samples);
 
-	void blitTo(gambatte::uint_least32_t *videoBuf, int pitch);
+	void blitTo(gambatte::uint_least32_t *videoBuf, std::ptrdiff_t pitch);
 
 	void setLayers(unsigned mask);
 

libgambatte/src/gambatte.cpp

@@ -68,7 +68,7 @@ void GB::setLayers(unsigned mask)
 	p_->cpu.setLayers(mask);
 }
 
-void GB::blitTo(gambatte::uint_least32_t *videoBuf, int pitch)
+void GB::blitTo(gambatte::uint_least32_t *videoBuf, std::ptrdiff_t pitch)
 {
 	gambatte::uint_least32_t *src = p_->vbuff;
 	gambatte::uint_least32_t *dst = videoBuf;

libgambatte/src/memory.h

@@ -333,7 +333,7 @@ public:
 	void setSoundBuffer(uint_least32_t *const buf) { sound.setBuffer(buf); }
 	unsigned fillSoundBuffer(unsigned long cc);
 
-	void setVideoBuffer(uint_least32_t *const videoBuf, const int pitch) {
+	void setVideoBuffer(uint_least32_t *const videoBuf, const std::ptrdiff_t pitch) {
 		display.setVideoBuffer(videoBuf, pitch);
 	}
 

libgambatte/src/video.cpp

@@ -750,7 +750,7 @@ void LCD::update(const unsigned long cycleCounter) {
 	ppu.update(cycleCounter);
 }
 
-void LCD::setVideoBuffer(uint_least32_t *const videoBuf, const int pitch) {
+void LCD::setVideoBuffer(uint_least32_t *const videoBuf, const std::ptrdiff_t pitch) {
 	ppu.setFrameBuf(videoBuf, pitch);
 }
 

libgambatte/src/video.h

@@ -127,7 +127,7 @@ public:
 	void loadState(const SaveState &state, const unsigned char *oamram);
 	void setDmgPaletteColor(unsigned palNum, unsigned colorNum, unsigned long rgb32);
 	void setCgbPalette(unsigned *lut);
-	void setVideoBuffer(uint_least32_t *videoBuf, int pitch);
+	void setVideoBuffer(uint_least32_t *videoBuf, std::ptrdiff_t pitch);
 	void setLayers(unsigned mask) { ppu.setLayers(mask); }
 	void setCgb(bool cgb);
 	void copyCgbPalettesToDmg();