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/*
winnie - an experimental window system
Copyright (C) 2013 Eleni Maria Stea
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Author: Eleni Maria Stea <elene.mst@gmail.com>
*/
#include <freetype/freetype.h>
#include <ft2build.h>
#include <stdint.h>
#include <stdlib.h>
#include "sdl/gfx.h"
#include "text.h"
#include "winnie.h"
#define DPI 72
#define FONT_PATH "/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf"
#define FONT_SIZE 16
static int draw_glyph(Pixmap *pixmap, int x, int y, char c);
struct Text {
FT_Library ft_lib;
FT_Face ft_face;
int text_x, text_y;
int text_color[3];
};
static Text *text;
bool
init_text()
{
if (!(text = (Text *) malloc(sizeof *text))) {
return false;
}
if (FT_Init_FreeType(&text->ft_lib)) {
fprintf(stderr, "Failed to initialize the FreeType library!\n");
return false;
}
if (FT_New_Face(text->ft_lib, FONT_PATH, 0, &text->ft_face)) {
fprintf(stderr, "Failed to load font: %s\n", FONT_PATH);
return false;
}
if (FT_Set_Char_Size(text->ft_face, 0, FONT_SIZE * 64, DPI, DPI)) {
fprintf(stderr, "Failed to set font size\n");
return false;
}
set_text_color(255, 255, 255);
return true;
}
void
destroy_text()
{
free(text);
}
void
draw_text(const char *txt, Pixmap *pixmap)
{
if (!pixmap) {
pixmap = get_framebuffer_pixmap();
}
while (*txt != 0) {
text->text_x += draw_glyph(pixmap, text->text_x, text->text_y, *txt);
txt++;
}
}
void
set_text_position(int x, int y)
{
text->text_x = x;
text->text_y = y;
}
void
set_text_color(int r, int g, int b)
{
text->text_color[0] = r;
text->text_color[1] = g;
text->text_color[2] = b;
}
static int
draw_glyph(Pixmap *pixmap, int x, int y, char c)
{
if (FT_Load_Char(text->ft_face, c, FT_LOAD_RENDER)) {
return 0;
}
x += text->ft_face->glyph->bitmap_left;
y -= text->ft_face->glyph->bitmap_top;
FT_Bitmap *ft_bmp = &text->ft_face->glyph->bitmap;
unsigned char *bmp_ptr = ft_bmp->buffer;
unsigned char *pxm_ptr
= pixmap->get_image() + (pixmap->get_width() * y + x) * 4;
Rect clipping_rect = get_clipping_rect();
for (unsigned int i = 0; i < ft_bmp->rows; i++) {
int dest_y = i + y;
if (dest_y >= clipping_rect.y + clipping_rect.height) {
break;
}
if (dest_y >= clipping_rect.y) {
for (unsigned int j = 0; j < ft_bmp->width; j++) {
int dest_x = j + x;
if (dest_x >= clipping_rect.x + clipping_rect.width) {
break;
}
if (bmp_ptr[j] && dest_x >= clipping_rect.x) {
int a = (int) bmp_ptr[j];
pxm_ptr[4 * j]
= (a * text->text_color[0] + pxm_ptr[4 * j] * (255 - a)) / 255;
pxm_ptr[4 * j + 1]
= (a * text->text_color[1] + pxm_ptr[4 * j + 1] * (255 - a))
/ 255;
pxm_ptr[4 * j + 2]
= (a * text->text_color[2] + pxm_ptr[4 * j + 2] * (255 - a))
/ 255;
}
}
}
pxm_ptr += 4 * pixmap->get_width();
bmp_ptr += ft_bmp->pitch;
}
return text->ft_face->glyph->advance.x >> 6;
}
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