// Load a SpriteFont image into GPU memory
SpriteFont LoadSpriteFont(const char* fileName)
{
SpriteFont spriteFont;
Image image;
// Check file extension
if (strcmp(GetExtension(fileName),"rbmf") == 0) spriteFont = LoadRBMF(fileName);
else
{
// Use stb_image to load image data!
int imgWidth;
int imgHeight;
int imgBpp;
byte *imgData = stbi_load(fileName, &imgWidth, &imgHeight, &imgBpp, 4); // Force loading to 4 components (RGBA)
// Convert array to pixel array for working convenience
Color *imgDataPixel = (Color *)malloc(imgWidth * imgHeight * sizeof(Color));
Color *imgDataPixelPOT = NULL;
int pix = 0;
for (int i = 0; i < (imgWidth * imgHeight * 4); i += 4)
{
imgDataPixel[pix].r = imgData[i];
imgDataPixel[pix].g = imgData[i+1];
imgDataPixel[pix].b = imgData[i+2];
imgDataPixel[pix].a = imgData[i+3];
pix++;
}
stbi_image_free(imgData);
// At this point we have a pixel array with all the data...
// Process bitmap Font pixel data to get measures (Character array)
// spriteFont.charSet data is filled inside the function and memory is allocated!
int numChars = ParseImageData(imgDataPixel, imgWidth, imgHeight, &spriteFont.charSet);
TraceLog(INFO, "[%s] SpriteFont data parsed correctly", fileName);
TraceLog(INFO, "[%s] SpriteFont num chars detected: %i", numChars);
spriteFont.numChars = numChars;
// Convert image font to POT image before conversion to texture
// Just add the required amount of pixels at the right and bottom sides of image...
int potWidth = GetNextPOT(imgWidth);
int potHeight = GetNextPOT(imgHeight);
// Check if POT texture generation is required (if texture is not already POT)
if ((potWidth != imgWidth) || (potHeight != imgHeight))
{
// Generate POT array from NPOT data
imgDataPixelPOT = (Color *)malloc(potWidth * potHeight * sizeof(Color));
for (int j = 0; j < potHeight; j++)
{
for (int i = 0; i < potWidth; i++)
{
if ((j < imgHeight) && (i < imgWidth)) imgDataPixelPOT[j*potWidth + i] = imgDataPixel[j*imgWidth + i];
else imgDataPixelPOT[j*potWidth + i] = MAGENTA;
}
}
TraceLog(WARNING, "SpriteFont texture converted to POT: %ix%i", potWidth, potHeight);
}
free(imgDataPixel);
image.pixels = imgDataPixelPOT;
image.width = potWidth;
image.height = potHeight;
spriteFont.texture = CreateTexture(image, false); // Convert loaded image to OpenGL texture
UnloadImage(image);
}
return spriteFont;
}
// Generate a sprite font from TTF file data (font size required)
// TODO: Review texture packing method and generation (use oversampling)
static SpriteFont LoadTTF(const char *fileName, int fontSize, int numChars, int *fontChars)
{
// NOTE: Font texture size is predicted (being as much conservative as possible)
// Predictive method consist of supposing same number of chars by line-column (sqrtf)
// and a maximum character width of 3/4 of fontSize... it worked ok with all my tests...
int textureSize = GetNextPOT(ceil((float)fontSize*3/4)*ceil(sqrtf((float)numChars)));
TraceLog(INFO, "TTF spritefont loading: Predicted texture size: %ix%i", textureSize, textureSize);
unsigned char *ttfBuffer = (unsigned char *)malloc(1 << 25);
unsigned char *dataBitmap = (unsigned char *)malloc(textureSize*textureSize*sizeof(unsigned char)); // One channel bitmap returned!
stbtt_bakedchar *charData = (stbtt_bakedchar *)malloc(sizeof(stbtt_bakedchar)*numChars);
SpriteFont font = { 0 };
FILE *ttfFile = fopen(fileName, "rb");
if (ttfFile == NULL)
{
TraceLog(WARNING, "[%s] TTF file could not be opened", fileName);
return font;
}
fread(ttfBuffer, 1, 1<<25, ttfFile);
if (fontChars[0] != 32) TraceLog(WARNING, "TTF spritefont loading: first character is not SPACE(32) character");
// NOTE: Using stb_truetype crappy packing method, no guarante the font fits the image...
// TODO: Replace this function by a proper packing method and support random chars order,
// we already receive a list (fontChars) with the ordered expected characters
int result = stbtt_BakeFontBitmap(ttfBuffer, 0, fontSize, dataBitmap, textureSize, textureSize, fontChars[0], numChars, charData);
//if (result > 0) TraceLog(INFO, "TTF spritefont loading: first unused row of generated bitmap: %i", result);
if (result < 0) TraceLog(WARNING, "TTF spritefont loading: Not all the characters fit in the font");
free(ttfBuffer);
// Convert image data from grayscale to to UNCOMPRESSED_GRAY_ALPHA
unsigned char *dataGrayAlpha = (unsigned char *)malloc(textureSize*textureSize*sizeof(unsigned char)*2); // Two channels
for (int i = 0, k = 0; i < textureSize*textureSize; i++, k += 2)
{
dataGrayAlpha[k] = 255;
dataGrayAlpha[k + 1] = dataBitmap[i];
}
free(dataBitmap);
// Sprite font generation from TTF extracted data
Image image;
image.width = textureSize;
image.height = textureSize;
image.mipmaps = 1;
image.format = UNCOMPRESSED_GRAY_ALPHA;
image.data = dataGrayAlpha;
font.texture = LoadTextureFromImage(image);
//WritePNG("generated_ttf_image.png", (unsigned char *)image.data, image.width, image.height, 2);
UnloadImage(image); // Unloads dataGrayAlpha
font.size = fontSize;
font.numChars = numChars;
font.charValues = (int *)malloc(font.numChars*sizeof(int));
font.charRecs = (Rectangle *)malloc(font.numChars*sizeof(Rectangle));
font.charOffsets = (Vector2 *)malloc(font.numChars*sizeof(Vector2));
font.charAdvanceX = (int *)malloc(font.numChars*sizeof(int));
for (int i = 0; i < font.numChars; i++)
{
font.charValues[i] = fontChars[i];
font.charRecs[i].x = (int)charData[i].x0;
font.charRecs[i].y = (int)charData[i].y0;
font.charRecs[i].width = (int)charData[i].x1 - (int)charData[i].x0;
font.charRecs[i].height = (int)charData[i].y1 - (int)charData[i].y0;
font.charOffsets[i] = (Vector2){ charData[i].xoff, charData[i].yoff };
font.charAdvanceX[i] = (int)charData[i].xadvance;
}
free(charData);
return font;
}
