Improving sprite fonts support...

Support grayscale (8 bit) textures for fonts
Load unordered chars data above char 126

src/text.c

@@ -355,7 +355,7 @@ void DrawTextEx(SpriteFont spriteFont, const char *text, Vector2 position, float
             else rec = spriteFont.charRecs[(int)text[i] - FONT_FIRST_CHAR];
         }
 
-        if (rec.x > 0)
+        if (rec.x >= 0)
         {
             DrawTexturePro(spriteFont.texture, rec, (Rectangle){ position.x + textOffsetX + spriteFont.charOffsets[(int)text[i] - FONT_FIRST_CHAR].x*scaleFactor,
                                                                  position.y + textOffsetY + spriteFont.charOffsets[(int)text[i] - FONT_FIRST_CHAR].y*scaleFactor,
@@ -811,8 +811,12 @@ static SpriteFont LoadBMFont(const char *fileName)
     strncat(texPath, texFileName, strlen(texFileName));
 
     TraceLog(DEBUG, "[%s] Font texture loading path: %s", fileName, texPath);
+    
+    Image imFont = LoadImage(texPath);
+
+    if (imFont.format == UNCOMPRESSED_GRAYSCALE) ImageAlphaMask(&imFont, imFont);
 
-    font.texture = LoadTexture(texPath);
+    font.texture = LoadTextureFromImage(imFont);
     font.size = fontSize;
     font.numChars = numChars;
     font.charValues = (int *)malloc(numChars*sizeof(int));
@@ -820,12 +824,14 @@ static SpriteFont LoadBMFont(const char *fileName)
     font.charOffsets = (Vector2 *)malloc(numChars*sizeof(Vector2));
     font.charAdvanceX = (int *)malloc(numChars*sizeof(int));
 
+    UnloadImage(imFont);
+    
     free(texPath);
 
     int charId, charX, charY, charWidth, charHeight, charOffsetX, charOffsetY, charAdvanceX;
 
     bool unorderedChars = false;
-    int firstChar = 0;
+    int firstChar = 32;
 
     for (int i = 0; i < numChars; i++)
     {
@@ -833,8 +839,20 @@ static SpriteFont LoadBMFont(const char *fileName)
         sscanf(buffer, "char id=%i x=%i y=%i width=%i height=%i xoffset=%i yoffset=%i xadvance=%i",
                        &charId, &charX, &charY, &charWidth, &charHeight, &charOffsetX, &charOffsetY, &charAdvanceX);
 
-        if (i == 0) firstChar = charId;
-        else if (i != (charId - firstChar)) unorderedChars = true;
+        if ((i == 0) && (charId != FONT_FIRST_CHAR))
+        {
+            TraceLog(WARNING, "BMFont not supported: expected SPACE(32) as first character, falling back to default font");
+            firstChar = charId;
+            break;
+        }
+        else if ((i < (126 - FONT_FIRST_CHAR)) && (i != (charId - FONT_FIRST_CHAR)))
+        {
+            // NOTE: We expect the first 95 chars (32..126) to be ordered for quick drawing access,
+            // characters above are stored and we look for them (search algorythm) when drawing
+            TraceLog(WARNING, "BMFont not supported: unordered chars data, falling back to default font");
+            unorderedChars = true;
+            break;
+        }
 
         // Save data properly in sprite font
         font.charValues[i] = charId;
@@ -845,9 +863,6 @@ static SpriteFont LoadBMFont(const char *fileName)
 
     fclose(fntFile);
 
-    if (firstChar != FONT_FIRST_CHAR) TraceLog(WARNING, "BMFont not supported: expected SPACE(32) as first character, falling back to default font");
-    else if (unorderedChars) TraceLog(WARNING, "BMFont not supported: unordered chars data, falling back to default font");
-
     // NOTE: Font data could be not ordered by charId: 32,33,34,35... raylib does not support unordered BMFonts
     if ((firstChar != FONT_FIRST_CHAR) || (unorderedChars) || (font.texture.id == 0))
     {

src/textures.c

@@ -694,28 +694,45 @@ void ImageFormat(Image *image, int newFormat)
 }
 
 // Apply alpha mask to image
-// NOTE 1: Returned image is RGBA - 32bit
+// NOTE 1: Returned image is GRAY_ALPHA (16bit) or RGBA (32bit)
 // NOTE 2: alphaMask should be same size as image
 void ImageAlphaMask(Image *image, Image alphaMask)
 {
-    if (image->format >= COMPRESSED_DXT1_RGB)
+    if ((image->width != alphaMask.width) || (image->height != alphaMask.height))
+    {
+        TraceLog(WARNING, "Alpha mask must be same size as image");
+    }
+    else if (image->format >= COMPRESSED_DXT1_RGB)
     {
         TraceLog(WARNING, "Alpha mask can not be applied to compressed data formats");
-        return;
     }
     else
     {
         // Force mask to be Grayscale
         Image mask = ImageCopy(alphaMask);
-        ImageFormat(&mask, UNCOMPRESSED_GRAYSCALE);
+        if (mask.format != UNCOMPRESSED_GRAYSCALE) ImageFormat(&mask, UNCOMPRESSED_GRAYSCALE);
         
-        // Convert image to RGBA
-        if (image->format != UNCOMPRESSED_R8G8B8A8) ImageFormat(image, UNCOMPRESSED_R8G8B8A8);
-
-        // Apply alpha mask to alpha channel
-        for (int i = 0, k = 3; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 4)
+        // In case image is only grayscale, we just add alpha channel
+        if (image->format == UNCOMPRESSED_GRAYSCALE)
+        {
+            ImageFormat(image, UNCOMPRESSED_GRAY_ALPHA);
+            
+            // Apply alpha mask to alpha channel
+            for (int i = 0, k = 1; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 2)
+            {
+                ((unsigned char *)image->data)[k] = ((unsigned char *)mask.data)[i];
+            }
+        }
+        else
         {
-            ((unsigned char *)image->data)[k] = ((unsigned char *)mask.data)[i];
+            // Convert image to RGBA
+            if (image->format != UNCOMPRESSED_R8G8B8A8) ImageFormat(image, UNCOMPRESSED_R8G8B8A8);
+
+            // Apply alpha mask to alpha channel
+            for (int i = 0, k = 3; (i < mask.width*mask.height) || (i < image->width*image->height); i++, k += 4)
+            {
+                ((unsigned char *)image->data)[k] = ((unsigned char *)mask.data)[i];
+            }
         }
 
         UnloadImage(mask);