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yText.c
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yText.c
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/*
* Copyright (c) 2009-2017 Yannick Garcia <thaddeus.dupont@free.fr>
*
* yImage is free software; you can redistribute it and/or modify
* it under the terms of the GPL license. See LICENSE for details.
*/
/**
* \file yText.c
* \brief text drawing functions.
*/
#include "yText.h"
#include <string.h>
#include <stdio.h>
yImage *y_create_text(font_t *font, char *text, yColor *color){
int l;
yImage *im;
int err;
unsigned char *car; /* the char to display */
int longCar; /* number of bytes of car */
int i;
if(font==NULL) return NULL;
if(text==NULL) return NULL;
l=strlen(text);
im=y_create_image(&err, NULL, font->header.width*l, font->header.height);
y_transp(im);
int nb;
int pos = 0;
for(i=0; i<l; i=i+nb){
longCar=font->header.charsize;
car=get_glyph(font, text+i, &nb);
if(car!=NULL){
/* TODO : do this better */
int j;
for(j=0; j<longCar; j++){
int k;
for(k=7; k>0; k--){
int p=((1<<k)&car[j]);
if(p) {
y_set_pixel(im, color, (pos*font->header.width)+(7-k), j);
}
}
}
} else {
// failled getting the character
int j;
for(j=0; j<longCar; j++){
int k;
for(k=7; k>0; k--){
y_set_pixel(im, color, (pos*font->header.width)+(7-k), j);
}
}
fprintf(stderr, "Could not load the font's glyph number %d\n",(unsigned char) text[i]);
}
pos++;
}
return im;
}
int y_display_text(yImage *background, int x, int y, char *text) {
int err;
font_t *font;
font = read_default_font(&err);
if(err != 0){
fprintf(stderr, "Error opening default font - Write failed\n");
return err;
}
err = y_display_text_with_font(background, x, y, text, font);
release_font(font);
return err;
}
int y_display_text_with_color(yImage *background, int x, int y, char *text, yColor *color) {
int err;
font_t *font;
font = read_default_font(&err);
if(err != 0){
fprintf(stderr, "Error opening default font - Write failed\n");
return err;
}
err = y_display_text_with_font_and_color(background, x, y, text, font, color);
release_font(font);
return err;
}
int y_display_text_with_font(yImage *background, int x, int y, char *text, font_t *font){
yColor black;
y_set_color(&black, 0, 0, 0, 255);
return y_display_text_with_font_and_color(background, x, y, text, font, &black);
}
/**
* The image of a glyph.
*/
yImage *y_create_glyph(font_t *font, int index, yColor *color){
yImage *im;
int err;
unsigned char *car; /* the char to display */
int longCar; /* number of bytes of car */
if(font==NULL) return NULL;
im=y_create_image(&err, NULL, font->header.width, font->header.height);
y_transp(im);
longCar=font->header.charsize;
car = get_character(font, index);
if(car!=NULL){
/* TODO : do this better */
int j;
for(j=0; j<longCar; j++){
int k;
for(k=7; k>0; k--){
int p=((1<<k)&car[j]);
if(p) {
y_set_pixel(im, color, 7-k, j);
}
}
}
} else {
// failled getting the character
int j;
for(j=0; j<longCar; j++){
int k;
for(k=7; k>0; k--){
y_set_pixel(im, color, 7-k, j);
}
}
fprintf(stderr, "Could not load the font's glyph with index %d\n", index);
}
return im;
}
/**
* To display a font's glyph.
*/
int y_display_font_char(yImage *background, int x, int y, int index, font_t *font){
yColor black;
y_set_color(&black, 0, 0, 0, 255);
return y_display_font_char_with_color(background, x, y, index, font, &black);
}
int y_display_text_with_font_and_color(yImage *background, int x, int y, char *text, font_t *font, yColor *color){
yImage *textIm;
textIm=y_create_text(font, text, color);
if(textIm==NULL) return 0;
y_superpose_images(background, textIm, x, y);
y_destroy_image(textIm);
return 0;
}
static yImage *rotate_90_degrees(yImage *input) {
int i, j;
int err;
yImage *rotated = y_create_image(&err, NULL, input->rgbHeight, input->rgbWidth);
if(input->hasShapeColor) {
rotated->hasShapeColor = 1;
rotated->shapeColor = input->shapeColor;
}
for(i=0; i<input->rgbWidth; i++) {
for(j=0; j<input->rgbHeight; j++) {
int oPos = j + (rotated->rgbHeight - 1 - i)*rotated->rgbWidth;
int iPos = i + j*input->rgbWidth;
rotated->rgbData[3*oPos] = input->rgbData[3*iPos];
rotated->rgbData[3*oPos+1] = input->rgbData[3*iPos+1];
rotated->rgbData[3*oPos+2] = input->rgbData[3*iPos+2];
rotated->alphaChanel[oPos] = input->alphaChanel[iPos];
}
}
return rotated;
}
int y_display_text_vertically_with_font_and_color(yImage *background, int x, int y, char *text, font_t *font, yColor *color){
yImage *textIm;
yImage *rotatedTextIm;
textIm=y_create_text(font, text, color);
if(textIm==NULL) return 0;
rotatedTextIm = rotate_90_degrees(textIm);
y_destroy_image(textIm);
y_superpose_images(background, rotatedTextIm, x, y);
y_destroy_image(rotatedTextIm);
return 0;
}
int y_display_text_vertically_with_font(yImage *background, int x, int y, char *text, font_t *font){
yColor black;
y_set_color(&black, 0, 0, 0, 255);
return y_display_text_vertically_with_font_and_color(background, x, y, text, font, &black);
}
/**
* To display a font's glyph.
*/
int y_display_font_char_with_color(yImage *background, int x, int y, int index, font_t *font, yColor *color){
yImage *textIm;
textIm=y_create_glyph(font, index, color);
if(textIm==NULL) return 0;
y_superpose_images(background, textIm, x, y);
y_destroy_image(textIm);
return 0;
}