make sure sensor mode has unsigned fields (#43)

Author: aler9

camera.cpp

@@ -76,7 +76,7 @@ static int create_dma_allocator() {
 
 // https://github.com/raspberrypi/libcamera-apps/blob/dd97618a25523c2c4aa58f87af5f23e49aa6069c/core/libcamera_app.cpp#L42
 static PixelFormat mode_to_pixel_format(sensor_mode_t *mode) {
-    static std::vector<std::pair<std::pair<int, bool>, PixelFormat>> table = {
+    static std::vector<std::pair<std::pair<unsigned int, bool>, PixelFormat>> table = {
         { {8, false}, formats::SBGGR8 },
         { {8, true}, formats::SBGGR8 },
         { {10, false}, formats::SBGGR10 },

sensor_mode.h

@@ -4,9 +4,9 @@
 #include <stdbool.h>
 
 typedef struct {
-    int width;
-    int height;
-    int bit_depth;
+    unsigned int width;
+    unsigned int height;
+    unsigned int bit_depth;
     bool packed;
 } sensor_mode_t;