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Reviewed LoadFontData() and GenImageFontAtlas()

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Ray 2018-07-15 20:03:05 +02:00
parent 971a7419ec
commit 292499bdeb
1 changed files with 26 additions and 7 deletions
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33
src/text.c
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@ -337,6 +337,9 @@ CharInfo *LoadFontData(const char *fileName, int fontSize, int *fontChars, int c
#define SDF_ON_EDGE_VALUE 128
#define SDF_PIXEL_DIST_SCALE 64.0f
// In case no chars count provided, default to 95
charsCount = (charsCount > 0) ? charsCount : 95;
CharInfo *chars = (CharInfo *)malloc(charsCount*sizeof(CharInfo));
// Load font data (including pixel data) from TTF file
@ -419,18 +422,26 @@ Image GenImageFontAtlas(CharInfo *chars, int charsCount, int fontSize, int paddi
{
Image atlas = { 0 };
// Calculate texture size based on required pixel area
// NOTE: Texture is forced to be squared and POT
// In case no chars count provided we suppose default of 95
charsCount = (charsCount > 0) ? charsCount : 95;
// Calculate image size based on required pixel area
// NOTE 1: Image is forced to be squared and POT... very conservative!
// NOTE 2: SDF font characters already contain an internal padding,
// so image size would result bigger than default font type
float requiredArea = 0;
for (int i = 0; i < charsCount; i++) requiredArea += ((chars[i].rec.width + 2*padding)*(chars[i].rec.height + 2*padding));
float guessSize = sqrtf(requiredArea)*1.25f;
int textureSize = (int)powf(2, ceilf(logf((float)guessSize)/logf(2))); // Calculate next POT
int imageSize = (int)powf(2, ceilf(logf((float)guessSize)/logf(2))); // Calculate next POT
atlas.width = textureSize; // Atlas bitmap width
atlas.height = textureSize; // Atlas bitmap height
atlas.width = imageSize; // Atlas bitmap width
atlas.height = imageSize; // Atlas bitmap height
atlas.data = (unsigned char *)calloc(1, atlas.width*atlas.height); // Create a bitmap to store characters (8 bpp)
atlas.format = UNCOMPRESSED_GRAYSCALE;
atlas.mipmaps = 1;
// DEBUG: We can see padding in the generated image setting a gray background...
//for (int i = 0; i < atlas.width*atlas.height; i++) ((unsigned char *)atlas.data)[i] = 100;
if (packMethod == 0) // Use basic packing algorythm
{
@ -453,11 +464,15 @@ Image GenImageFontAtlas(CharInfo *chars, int charsCount, int fontSize, int paddi
chars[i].rec.y = offsetY;
// Move atlas position X for next character drawing
offsetX += ((int)chars[i].advanceX + 2*padding);
offsetX += ((int)chars[i].rec.width + 2*padding);
if (offsetX >= (atlas.width - (int)chars[i].rec.width - padding))
{
offsetX = padding;
// NOTE: Be careful on offsetY for SDF fonts, by default SDF
// use an internal padding of 4 pixels, it means char rectangle
// height is bigger than fontSize, it could be up to (fontSize + 8)
offsetY += (fontSize + 2*padding);
if (offsetY > (atlas.height - fontSize - padding)) break;
@ -466,6 +481,8 @@ Image GenImageFontAtlas(CharInfo *chars, int charsCount, int fontSize, int paddi
}
else if (packMethod == 1) // Use Skyline rect packing algorythm (stb_pack_rect)
{
TraceLog(LOG_DEBUG, "Using Skyline packing algorythm!");
stbrp_context *context = (stbrp_context *)malloc(sizeof(*context));
stbrp_node *nodes = (stbrp_node *)malloc(charsCount*sizeof(*nodes));
@ -506,9 +523,11 @@ Image GenImageFontAtlas(CharInfo *chars, int charsCount, int fontSize, int paddi
free(context);
}
// TODO: Crop image if required for smaller size
// Convert image data from GRAYSCALE to GRAY_ALPHA
// WARNING: ImageAlphaMask(&atlas, atlas) does not work in this case, requires manual operation
unsigned char *dataGrayAlpha = (unsigned char *)malloc(textureSize*textureSize*sizeof(unsigned char)*2); // Two channels
unsigned char *dataGrayAlpha = (unsigned char *)malloc(imageSize*imageSize*sizeof(unsigned char)*2); // Two channels
for (int i = 0, k = 0; i < atlas.width*atlas.height; i++, k += 2)
{