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[Kandinsky] Clean the font rasterizer

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Change-Id: Id7bdfa286aa3138f98b0d8e7b3be2e2189e0ef2b
This commit is contained in:
Romain Goyet
2016-08-12 18:29:14 +02:00
parent 7789123913
commit ec6392ccca
1 changed files with 26 additions and 24 deletions
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50
kandinsky/fonts/rasterizer.c
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@@ -1,13 +1,11 @@
/* example1.c */
/* */
/* This small program shows how to print a rotated string with the */
/* FreeType 2 library. */
/*
/* The font rasterizer takes a standard font and converts it into a bitmap
* embeddable font. In other words, it takes a .ttf in and outputs a .c/.h pair.
*
* It can also print a PNG file showing how each glyph has been rendered.
*
* Usage: rasterizer font_name glyph_width glyph_height
* -> Generates a .png image with the font rasterized
* -> Generates a .c file with the content of the font
*/
* -> Generates a .c file with the content of the font */
#include <stdio.h>
#include <string.h>
@@ -93,27 +91,32 @@ int main(int argc, char * argv[]) {
ENSURE(!FT_Set_Pixel_Sizes(face, requested_glyph_width, requested_glyph_height), "Setting face pixel size to %dx%d", requested_glyph_width, requested_glyph_height);
int maxHeight = 0;
/* Glyph metrics are complicated. Here are some useful links:
* https://www.freetype.org/freetype2/docs/glyphs/metrics.png
* https://www.freetype.org/freetype2/docs/glyphs/glyphs-3.html
* https://www.freetype.org/freetype2/docs/reference/ft2-basic_types.html#FT_Bitmap
*/
int maxWidth = 0;
int minTop = requested_glyph_height;
int maxAboveBaseline = 0;
int maxBelowBaseline = 0;
for (unsigned char character = CHARACTER_RANGE_START; character <= CHARACTER_RANGE_END; character++) {
ENSURE(!FT_Load_Char(face, character, FT_LOAD_RENDER), "Loading character 0x%02x", character);
int top = requested_glyph_height - face->glyph->bitmap_top;
int height = top + face->glyph->bitmap.rows;
int width = face->glyph->bitmap.width;
if (top < minTop) {
minTop = top;
}
if (height > maxHeight) {
maxHeight = height;
}
int aboveBaseline = face->glyph->bitmap_top;
int belowBaseline = face->glyph->bitmap.rows - face->glyph->bitmap_top;
int width = face->glyph->bitmap_left + face->glyph->bitmap.width;
if (width > maxWidth) {
maxWidth = width;
}
if (aboveBaseline > maxAboveBaseline) {
maxAboveBaseline = aboveBaseline;
}
if (belowBaseline > maxBelowBaseline) {
maxBelowBaseline = belowBaseline;
}
}
int glyph_width = maxWidth;
int glyph_height = maxHeight-minTop;
int glyph_height = maxAboveBaseline+maxBelowBaseline;
//printf("Actual glyph size = %dx%d\n", glyph_width, glyph_height);
int grid_size = 1;
@@ -134,8 +137,6 @@ int main(int argc, char * argv[]) {
}
}
// We're doing the ASCII table, so characters from 0 to 255 inclusive
for (unsigned char character = CHARACTER_RANGE_START; character <= CHARACTER_RANGE_END; character++) {
int x = (character-CHARACTER_RANGE_START)%(GRID_WIDTH);
@@ -145,8 +146,9 @@ int main(int argc, char * argv[]) {
//printf("Advances = %dx%d\n", face->glyph->bitmap_left, face->glyph->bitmap_top);
drawGlyphInImage(&face->glyph->bitmap,
&bitmap_image,
x*(glyph_width+grid_size) /* + face->glyph->bitmap_left*/,
y*(glyph_height+grid_size) + requested_glyph_height - face->glyph->bitmap_top - minTop);// + glyph_height - face->glyph->bitmap_top - maxHeight);
x*(glyph_width+grid_size) + face->glyph->bitmap_left,
y*(glyph_height+grid_size) + maxAboveBaseline - face->glyph->bitmap_top
);
}
#if GENERATE_PNG