33af0dec28
Remove the hardcoded (and way too small) scroll threshold (the distance moved in pixels before we think the users wants to scroll) and replace it with something based on the actual DPI of the screen. On Android we call the API for that, on other touchscreens we reimplemented Android's formula (as of 2.2) and calculate it. Flyspray: 11727 git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28548 a1c6a512-1295-4272-9138-f99709370657
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 Dan Everton
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <SDL.h>
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#include "lcd-sdl.h"
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#include "sim-ui-defines.h"
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#include "system.h" /* for MIN() and MAX() */
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int display_zoom = 1;
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void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
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int height, int max_x, int max_y,
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unsigned long (*getpixel)(int, int))
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{
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int x, y;
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int xmax, ymax;
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SDL_Rect dest;
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ymax = y_start + height;
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xmax = x_start + width;
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if(xmax > max_x)
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xmax = max_x;
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if(ymax >= max_y)
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ymax = max_y;
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SDL_LockSurface(surface);
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dest.w = display_zoom;
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dest.h = display_zoom;
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for (x = x_start; x < xmax; x++) {
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dest.x = x * display_zoom;
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#ifdef HAVE_LCD_SPLIT
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for (y = y_start; y < MIN(ymax, LCD_SPLIT_POS); y++) {
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dest.y = y * display_zoom;
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SDL_FillRect(surface, &dest, (Uint32)(getpixel(x, y) | 0x80));
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}
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for (y = MAX(y_start, LCD_SPLIT_POS); y < ymax; y++) {
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dest.y = (y + LCD_SPLIT_LINES) * display_zoom ;
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SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
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}
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#else
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for (y = y_start; y < ymax; y++) {
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dest.y = y * display_zoom;
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SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
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}
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#endif
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}
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SDL_UnlockSurface(surface);
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}
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void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
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int height, int max_x, int max_y, int ui_x, int ui_y)
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{
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if (x_start + width > max_x)
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width = max_x - x_start;
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if (y_start + height > max_y)
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height = max_y - y_start;
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SDL_Rect src = {x_start * display_zoom, y_start * display_zoom,
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width * display_zoom, height * display_zoom};
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SDL_Rect dest= {(ui_x + x_start) * display_zoom,
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(ui_y + y_start) * display_zoom,
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width * display_zoom, height * display_zoom};
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if (surface->flags & SDL_SRCALPHA) /* alpha needs a black background */
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SDL_FillRect(gui_surface, &dest, 0);
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SDL_BlitSurface(surface, &src, gui_surface, &dest);
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SDL_Flip(gui_surface);
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}
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/* set a range of bitmap indices to a gradient from startcolour to endcolour */
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void sdl_set_gradient(SDL_Surface *surface, SDL_Color *start, SDL_Color *end,
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int first, int steps)
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{
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int i;
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SDL_Color palette[steps];
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for (i = 0; i < steps; i++) {
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palette[i].r = start->r + (end->r - start->r) * i / (steps - 1);
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palette[i].g = start->g + (end->g - start->g) * i / (steps - 1);
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palette[i].b = start->b + (end->b - start->b) * i / (steps - 1);
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}
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SDL_SetPalette(surface, SDL_LOGPAL|SDL_PHYSPAL, palette, first, steps);
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}
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int lcd_get_dpi(void)
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{
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/* TODO: find a way to query it from the OS, SDL doesn't support it
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* directly; for now assume the more or less standard 96 */
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return 96;
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}
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