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rockbox/apps/gui/color_picker.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) Jonathan Gordon (2006)
*
* 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 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "stdarg.h"
#include "string.h"
#include "stdio.h"
#include "kernel.h"
#include "system.h"
#include "screen_access.h"
#include "font.h"
#include "debug.h"
#include "misc.h"
#include "settings.h"
#include "scrollbar.h"
#include "lang.h"
#include "splash.h"
#include "action.h"
#include "icon.h"
#include "color_picker.h"
/* structure for color info */
struct rgb_pick
{
unsigned color; /* native color value */
union
{
unsigned char rgb_val[6]; /* access to components as array */
struct
{
unsigned char r; /* native red value */
unsigned char g; /* native green value */
unsigned char b; /* native blue value */
unsigned char red; /* 8 bit red value */
unsigned char green; /* 8 bit green value */
unsigned char blue; /* 8 bit blue value */
} __attribute__ ((__packed__)); /* assume byte packing */
};
};
/* list of primary colors */
#define SB_PRIM 0
#define SB_FILL 1
static const fb_data prim_rgb[][3] =
{
/* Foreground colors for sliders */
{
LCD_RGBPACK(255, 0, 0),
LCD_RGBPACK( 0, 255, 0),
LCD_RGBPACK( 0, 0, 255),
},
/* Fill colors for sliders */
{
LCD_RGBPACK( 85, 0, 0),
LCD_RGBPACK( 0, 85, 0),
LCD_RGBPACK( 0, 0, 85),
},
};
/* maximum values for components */
static const unsigned char rgb_max[3] =
{
LCD_MAX_RED,
LCD_MAX_GREEN,
LCD_MAX_BLUE
};
/* Unpacks the color value into native rgb values and 24 bit rgb values */
static void unpack_rgb(struct rgb_pick *rgb)
{
unsigned color = _LCD_UNSWAP_COLOR(rgb->color);
rgb->red = _RGB_UNPACK_RED(color);
rgb->green = _RGB_UNPACK_GREEN(color);
rgb->blue = _RGB_UNPACK_BLUE(color);
rgb->r = _RGB_UNPACK_RED_LCD(color);
rgb->g = _RGB_UNPACK_GREEN_LCD(color);
rgb->b = _RGB_UNPACK_BLUE_LCD(color);
}
/* Packs the native rgb colors into a color value */
static inline void pack_rgb(struct rgb_pick *rgb)
{
rgb->color = LCD_RGBPACK_LCD(rgb->r, rgb->g, rgb->b);
}
/* Returns LCD_BLACK if the color is above a threshold brightness
else return LCD_WHITE */
static inline unsigned get_black_or_white(const struct rgb_pick *rgb)
{
return (2*rgb->red + 5*rgb->green + rgb->blue) >= 1024 ?
LCD_BLACK : LCD_WHITE;
}
#define MARGIN_LEFT 0 /* Left margin of screen */
#define MARGIN_TOP 2 /* Top margin of screen */
#define MARGIN_RIGHT 0 /* Right margin of screen */
#define MARGIN_BOTTOM 6 /* Bottom margin of screen */
#define SLIDER_MARGIN_LEFT 2 /* Gap to left of sliders */
#define SLIDER_MARGIN_RIGHT 2 /* Gap to right of sliders */
#define TITLE_MARGIN_BOTTOM 4 /* Space below title bar */
#define SELECTOR_LR_MARGIN 0 /* Margin between ">" and text */
#define SELECTOR_TB_MARGIN 1 /* Margin on top and bottom of selector */
#define SWATCH_TOP_MARGIN 4 /* Space between last slider and swatch */
#define SELECTOR_WIDTH get_icon_width(display->screen_type)
#define SELECTOR_HEIGHT 8 /* Height of > and < bitmaps */
/* dunno why lcd_set_drawinfo should be left out of struct screen */
static void set_drawinfo(struct screen *display, int mode,
unsigned foreground, unsigned background)
{
display->set_drawmode(mode);
if (display->depth > 1)
{
display->set_foreground(foreground);
display->set_background(background);
}
}
static void draw_screen(struct screen *display, char *title,
struct rgb_pick *rgb, int row)
{
unsigned text_color = LCD_BLACK;
unsigned background_color = LCD_WHITE;
char buf[32];
int i, x, y;
int text_top;
int slider_left, slider_width;
bool display_three_rows;
int max_label_width;
display->clear_display();
if (display->depth > 1)
{
text_color = display->get_foreground();
background_color = display->get_background();
}
/* Find out if there's enough room for three sliders or just
enough to display the selected slider - calculate total height
of display with three sliders present */
display_three_rows =
display->height >= MARGIN_TOP +
display->char_height*4 + /* Title + 3 sliders */
TITLE_MARGIN_BOTTOM +
SELECTOR_TB_MARGIN*6 + /* 2 margins/slider */
MARGIN_BOTTOM;
/* Figure out widest label character in case they vary -
this function assumes labels are one character */
for (i = 0, max_label_width = 0; i < 3; i++)
{
buf[0] = str(LANG_COLOR_RGB_LABELS)[i];
buf[1] = '\0';
x = display->getstringsize(buf, NULL, NULL);
if (x > max_label_width)
max_label_width = x;
}
/* Draw title string */
set_drawinfo(display, DRMODE_SOLID, text_color, background_color);
display->getstringsize(title, &x, &y);
display->putsxy((display->width - x) / 2, MARGIN_TOP, title);
/* Get slider positions and top starting position */
text_top = MARGIN_TOP + y + TITLE_MARGIN_BOTTOM + SELECTOR_TB_MARGIN;
slider_left = MARGIN_LEFT + SELECTOR_WIDTH + SELECTOR_LR_MARGIN +
max_label_width + SLIDER_MARGIN_LEFT;
slider_width = display->width - slider_left - SLIDER_MARGIN_RIGHT -
display->char_width*2 - SELECTOR_LR_MARGIN - SELECTOR_WIDTH -
MARGIN_RIGHT;
for (i = 0; i < 3; i++)
{
unsigned sb_flags = HORIZONTAL;
int mode = DRMODE_SOLID;
unsigned fg = text_color;
unsigned bg = background_color;
if (!display_three_rows)
i = row;
if (i == row)
{
set_drawinfo(display, DRMODE_SOLID, text_color,
background_color);
if (global_settings.cursor_style != 0)
{
/* Draw solid bar selection bar */
display->fillrect(0,
text_top - SELECTOR_TB_MARGIN,
display->width,
display->char_height +
SELECTOR_TB_MARGIN*2);
if (display->depth < 16)
{
sb_flags |= FOREGROUND | INNER_FILL;
mode |= DRMODE_INVERSEVID;
}
}
else if (display_three_rows)
{
/* Draw "> <" around sliders */
int top = text_top + (display->char_height -
SELECTOR_HEIGHT) / 2;
screen_put_iconxy(display, MARGIN_LEFT, top, Icon_Cursor);
screen_put_iconxy(display,
display->width - MARGIN_RIGHT -
get_icon_width(display->screen_type),
top, Icon_Cursor);
}
if (display->depth >= 16)
{
sb_flags |= FOREGROUND | INNER_BGFILL;
mode = DRMODE_FG;
fg = prim_rgb[SB_PRIM][i];
bg = prim_rgb[SB_FILL][i];
}
}
set_drawinfo(display, mode, fg, bg);
/* Draw label */
buf[0] = str(LANG_COLOR_RGB_LABELS)[i];
buf[1] = '\0';
display->putsxy(slider_left - display->char_width -
SLIDER_MARGIN_LEFT, text_top, buf);
/* Draw color value */
snprintf(buf, 3, "%02d", rgb->rgb_val[i]);
display->putsxy(slider_left + slider_width + SLIDER_MARGIN_RIGHT,
text_top, buf);
/* Draw scrollbar */
gui_scrollbar_draw(display,
slider_left,
text_top + display->char_height / 4,
slider_width,
display->char_height / 2,
rgb_max[i],
0,
rgb->rgb_val[i],
sb_flags);
/* Advance to next line */
text_top += display->char_height + 2*SELECTOR_TB_MARGIN;
if (!display_three_rows)
break;
} /* end for */
/* Draw color value in system font */
display->setfont(FONT_SYSFIXED);
/* Format RGB: #rrggbb */
snprintf(buf, sizeof(buf), str(LANG_COLOR_RGB_VALUE),
rgb->red, rgb->green, rgb->blue);
if (display->depth >= 16)
{
/* Display color swatch on color screens only */
int left = MARGIN_LEFT + SELECTOR_WIDTH + SELECTOR_LR_MARGIN;
int top = text_top + SWATCH_TOP_MARGIN;
int width = display->width - left - SELECTOR_LR_MARGIN -
SELECTOR_WIDTH - MARGIN_RIGHT;
int height = display->height - top - MARGIN_BOTTOM;
/* Only draw if room */
if (height >= display->char_height + 2)
{
display->set_foreground(rgb->color);
display->fillrect(left, top, width, height);
/* Draw RGB: #rrggbb in middle of swatch */
display->set_drawmode(DRMODE_FG);
display->getstringsize(buf, &x, &y);
display->set_foreground(get_black_or_white(rgb));
x = left + (width - x) / 2;
y = top + (height - y) / 2;
display->putsxy(x, y, buf);
display->set_drawmode(DRMODE_SOLID);
/* Draw border */
display->set_foreground(text_color);
display->drawrect(left, top, width, height);
}
}
else
{
/* Display RGB value only centered on remaining display if room */
display->getstringsize(buf, &x, &y);
i = text_top + SWATCH_TOP_MARGIN;
if (i + y <= display->height - MARGIN_BOTTOM)
{
set_drawinfo(display, DRMODE_SOLID, text_color, background_color);
x = (display->width - x) / 2;
y = (i + display->height - MARGIN_BOTTOM - y) / 2;
display->putsxy(x, y, buf);
}
}
display->setfont(FONT_UI);
display->update();
/* Be sure screen mode is reset */
set_drawinfo(display, DRMODE_SOLID, text_color, background_color);
}
#ifdef HAVE_TOUCHPAD
static int touchpad_slider(struct rgb_pick *rgb, int *selected_slider)
{
short x,y;
int text_top,i,x1;
int slider_left, slider_width;
unsigned button = action_get_touchpad_press(&x, &y);
bool display_three_rows;
int max_label_width;
struct screen *display = &screens[SCREEN_MAIN];
int pressed_slider;
char buf[2];
if (button == BUTTON_NONE)
return ACTION_NONE;
/* same logic as draw_screen */
/* Figure out widest label character in case they vary -
this function assumes labels are one character */
for (i = 0, max_label_width = 0; i < 3; i++)
{
buf[0] = str(LANG_COLOR_RGB_LABELS)[i];
buf[1] = '\0';
x1 = display->getstringsize(buf, NULL, NULL);
if (x1 > max_label_width)
max_label_width = x1;
}
/* Get slider positions and top starting position */
text_top = MARGIN_TOP + display->char_height + TITLE_MARGIN_BOTTOM + SELECTOR_TB_MARGIN;
slider_left = MARGIN_LEFT + SELECTOR_WIDTH + SELECTOR_LR_MARGIN +
max_label_width + SLIDER_MARGIN_LEFT;
slider_width = display->width - slider_left - SLIDER_MARGIN_RIGHT -
display->char_width*2 - SELECTOR_LR_MARGIN - SELECTOR_WIDTH -
MARGIN_RIGHT;
display_three_rows =
display->height >= MARGIN_TOP +
display->char_height*4 + /* Title + 3 sliders */
TITLE_MARGIN_BOTTOM +
SELECTOR_TB_MARGIN*6 + /* 2 margins/slider */
MARGIN_BOTTOM;
if (y < MARGIN_TOP+display->char_height)
{
if (button == BUTTON_REL)
return ACTION_STD_CANCEL;
}
y -= text_top;
pressed_slider = y/display->char_height;
if (pressed_slider > (display_three_rows?2:0))
{
if (button == BUTTON_REL)
return ACTION_STD_OK;
}
if (pressed_slider != *selected_slider)
*selected_slider = pressed_slider;
if (x < slider_left+slider_width &&
x > slider_left)
{
x -= slider_left;
rgb->rgb_val[pressed_slider] =
(x*rgb_max[pressed_slider]/(slider_width-slider_left));
pack_rgb(rgb);
}
return ACTION_NONE;
}
#endif
/***********
set_color
returns true if USB was inserted, false otherwise
color is a pointer to the colour (in native format) to modify
set banned_color to -1 to allow all
***********/
bool set_color(struct screen *display, char *title, unsigned *color,
unsigned banned_color)
{
int exit = 0, slider = 0;
struct rgb_pick rgb;
rgb.color = *color;
while (!exit)
{
int button;
unpack_rgb(&rgb);
if (display != NULL)
{
draw_screen(display, title, &rgb, slider);
}
else
{
int i;
FOR_NB_SCREENS(i)
draw_screen(&screens[i], title, &rgb, slider);
}
button = get_action(CONTEXT_SETTINGS_COLOURCHOOSER, TIMEOUT_BLOCK);
#ifdef HAVE_TOUCHPAD
if (button == ACTION_TOUCHPAD)
button = touchpad_slider(&rgb, &slider);
#endif
switch (button)
{
case ACTION_STD_PREV:
case ACTION_STD_PREVREPEAT:
slider = (slider + 2) % 3;
break;
case ACTION_STD_NEXT:
case ACTION_STD_NEXTREPEAT:
slider = (slider + 1) % 3;
break;
case ACTION_SETTINGS_INC:
case ACTION_SETTINGS_INCREPEAT:
if (rgb.rgb_val[slider] < rgb_max[slider])
rgb.rgb_val[slider]++;
pack_rgb(&rgb);
break;
case ACTION_SETTINGS_DEC:
case ACTION_SETTINGS_DECREPEAT:
if (rgb.rgb_val[slider] > 0)
rgb.rgb_val[slider]--;
pack_rgb(&rgb);
break;
case ACTION_STD_OK:
if (banned_color != (unsigned)-1 &&
banned_color == rgb.color)
{
gui_syncsplash(HZ*2, ID2P(LANG_COLOR_UNACCEPTABLE));
break;
}
*color = rgb.color;
exit = 1;
break;
case ACTION_STD_CANCEL:
exit = 1;
break;
default:
if (default_event_handler(button) == SYS_USB_CONNECTED)
return true;
break;
}
}
return false;
}
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