stbtt: chardata can be const in GetBakedQuad() and GetPackedQuad()

stb_truetype.h

@@ -50,6 +50,7 @@
 //       Higor Euripedes
 //       Thomas Fields
 //       Derek Vinyard
+//       Cort Stratton
 //
 // VERSION HISTORY
 //
@@ -494,7 +495,7 @@ typedef struct
    float x1,y1,s1,t1; // bottom-right
 } stbtt_aligned_quad;
 
-STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
                                int char_index,             // character to display
                                float *xpos, float *ypos,   // pointers to current position in screen pixel space
                                stbtt_aligned_quad *q,      // output: quad to draw
@@ -594,7 +595,7 @@ STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h
 // To use with PackFontRangesGather etc., you must set it before calls
 // call to PackFontRangesGatherRects.
 
-STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph,  // same data as above
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph,  // same data as above
                                int char_index,             // character to display
                                float *xpos, float *ypos,   // pointers to current position in screen pixel space
                                stbtt_aligned_quad *q,      // output: quad to draw
@@ -3287,11 +3288,11 @@ static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset,  // fo
    return bottom_y;
 }
 
-STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
 {
    float d3d_bias = opengl_fillrule ? 0 : -0.5f;
    float ipw = 1.0f / pw, iph = 1.0f / ph;
-   stbtt_bakedchar *b = chardata + char_index;
+   const stbtt_bakedchar *b = chardata + char_index;
    int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
    int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
 
@@ -3735,10 +3736,10 @@ STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontda
    return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
 }
 
-STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
 {
    float ipw = 1.0f / pw, iph = 1.0f / ph;
-   stbtt_packedchar *b = chardata + char_index;
+   const stbtt_packedchar *b = chardata + char_index;
 
    if (align_to_integer) {
       float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);