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Improved drawing speed by drawing whole columns at once (Matthias)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4707 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-05-26 23:49:42 +00:00
parent 052d21a667
commit 7115cf1d50
1 changed files with 5 additions and 7 deletions
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12
apps/plugins/mandelbrot.c
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@ -34,6 +34,7 @@ static int delta;
static int max_iter;
static unsigned char *gbuf;
static unsigned int gbuf_size = 0;
static unsigned char graybuffer[LCD_HEIGHT];
void init_mandelbrot_set(void){
@ -56,18 +57,15 @@ void calc_mandelbrot_set(void){
start_tick = *rb->current_tick;
// rb->lcd_clear_display();
// rb->lcd_update();
gray_clear_display();
x_fact = (x_max - x_min) / LCD_WIDTH;
y_fact = (y_max - y_min) / LCD_HEIGHT;
for (x_pixel = 0; x_pixel<LCD_WIDTH; x_pixel++){
a = (x_pixel * x_fact) + x_min;
for(y_pixel = LCD_HEIGHT-1; y_pixel>=0; y_pixel--){
b = (y_pixel * y_fact) + y_min;
for (x_pixel = LCD_WIDTH-1; x_pixel>=0; x_pixel--){
a = (x_pixel * x_fact) + x_min;
x = 0;
y = 0;
n_iter = 0;
@ -91,9 +89,9 @@ void calc_mandelbrot_set(void){
} else {
brightness = 255 - (31 * (n_iter & 7));
}
gray_drawpixel( x_pixel, y_pixel, brightness);
graybuffer[y_pixel]=brightness;
}
gray_drawgraymap(graybuffer, x_pixel, 0, 1, LCD_HEIGHT, 1);
}
}