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/* $Id: drv_generic_graphic.c 1003 2009-03-26 08:11:33Z michux $
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* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/drv_generic_graphic.c $
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* generic driver helper for graphic displays
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* Copyright (C) 1999, 2000 Michael Reinelt <michael@reinelt.co.at>
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* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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* This file is part of LCD4Linux.
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* int drv_generic_graphic_init (char *section, char *driver);
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* initializes the generic graphic driver
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* int drv_generic_graphic_draw (WIDGET *W);
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* renders Text widget into framebuffer
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* calls drv_generic_graphic_real_blit()
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* int drv_generic_graphic_icon_draw (WIDGET *W);
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* renders Icon widget into framebuffer
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* calls drv_generic_graphic_real_blit()
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* int drv_generic_graphic_bar_draw (WIDGET *W);
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* renders Bar widget into framebuffer
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* calls drv_generic_graphic_real_blit()
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* int drv_generic_graphic_quit (void);
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* closes generic graphic driver
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#include "widget_text.h"
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#include "widget_icon.h"
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#include "widget_bar.h"
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#include "widget_image.h"
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#include "drv_generic.h"
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#include "drv_generic_graphic.h"
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#include "font_6x8_bold.h"
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RGBA FG_COL = {.R = 0x00,.G = 0x00,.B = 0x00,.A = 0xff };
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RGBA BG_COL = {.R = 0xff,.G = 0xff,.B = 0xff,.A = 0xff };
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RGBA BL_COL = {.R = 0xff,.G = 0xff,.B = 0xff,.A = 0x00 };
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RGBA NO_COL = {.R = 0x00,.G = 0x00,.B = 0x00,.A = 0x00 };
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static char *Section = NULL;
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static char *Driver = NULL;
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static RGBA *drv_generic_graphic_FB[LAYERS] = { NULL, };
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static int INVERTED = 0;
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/* must be implemented by the real driver */
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void (*drv_generic_graphic_real_blit) () = NULL;
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/****************************************/
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/*** generic Framebuffer stuff ***/
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/****************************************/
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static void drv_generic_graphic_resizeFB(int rows, int cols)
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/* Layout FB is large enough */
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if (rows <= LROWS && cols <= LCOLS)
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/* get maximum values */
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for (l = 0; l < LAYERS; l++) {
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/* allocate and initialize new Layout FB */
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newFB = malloc(cols * rows * sizeof(*newFB));
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for (i = 0; i < rows * cols; i++)
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/* transfer contents */
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if (drv_generic_graphic_FB[l] != NULL) {
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for (row = 0; row < LROWS; row++) {
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for (col = 0; col < LCOLS; col++) {
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newFB[row * cols + col] = drv_generic_graphic_FB[l][row * LCOLS + col];
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free(drv_generic_graphic_FB[l]);
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drv_generic_graphic_FB[l] = newFB;
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static void drv_generic_graphic_window(int pos, int size, int max, int *wpos, int *wsize)
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if (p1 > max || p2 < 0 || size < 1)
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static void drv_generic_graphic_blit(const int row, const int col, const int height, const int width)
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if (drv_generic_graphic_real_blit) {
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drv_generic_graphic_window(row, height, DROWS, &r, &h);
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drv_generic_graphic_window(col, width, DCOLS, &c, &w);
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if (h > 0 && w > 0) {
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drv_generic_graphic_real_blit(r, c, h, w);
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static RGBA drv_generic_graphic_blend(const int row, const int col)
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/* find first opaque layer */
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/* layers below are fully covered */
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for (l = 0; l < LAYERS; l++) {
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p = drv_generic_graphic_FB[l][row * LCOLS + col];
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for (l = o; l >= 0; l--) {
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p = drv_generic_graphic_FB[l][row * LCOLS + col];
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ret.R = (p.R * p.A + ret.R * (255 - p.A)) / 255;
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ret.G = (p.G * p.A + ret.G * (255 - p.A)) / 255;
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ret.B = (p.B * p.A + ret.B * (255 - p.A)) / 255;
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/****************************************/
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/*** generic text handling ***/
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/****************************************/
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static void drv_generic_graphic_render(const int layer, const int row, const int col, const RGBA fg, const RGBA bg,
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const char *style, const char *txt)
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if (layer < 0 || layer >= LAYERS) {
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error("%s: layer %d out of bounds (0..%d)", Driver, layer, LAYERS - 1);
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/* maybe grow layout framebuffer */
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drv_generic_graphic_resizeFB(row + YRES, col + XRES * len);
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/* render text into layout FB */
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while (*txt != '\0') {
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if (strstr(style, "bold") != NULL) {
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chr = Font_6x8_bold[(int) *(unsigned char *) txt];
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chr = Font_6x8[(int) *(unsigned char *) txt];
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for (y = 0; y < YRES; y++) {
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int mask = 1 << XRES;
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for (x = 0; x < XRES; x++) {
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drv_generic_graphic_FB[layer][(r + y) * LCOLS + c + x] = fg;
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drv_generic_graphic_FB[layer][(r + y) * LCOLS + c + x] = bg;
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drv_generic_graphic_blit(row, col, YRES, XRES * len);
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/* say hello to the user */
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int drv_generic_graphic_greet(const char *msg1, const char *msg2)
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char *line1[] = { "* LCD4Linux " VERSION " *",
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"LCD4Linux " VERSION,
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char *line2[] = { "http://lcd4linux.bulix.org",
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"lcd4linux.bulix.org",
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unsigned int cols = DCOLS / XRES;
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unsigned int rows = DROWS / YRES;
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for (i = 0; line1[i]; i++) {
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if (strlen(line1[i]) <= cols) {
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drv_generic_graphic_render(0, YRES * 0, XRES * ((cols - strlen(line1[i])) / 2), FG_COL, BG_COL, "norm",
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for (i = 0; line2[i]; i++) {
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if (strlen(line2[i]) <= cols) {
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drv_generic_graphic_render(0, YRES * 1, XRES * ((cols - strlen(line2[i])) / 2), FG_COL, BG_COL, "norm",
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if (msg1 && rows >= 3) {
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unsigned int len = strlen(msg1);
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drv_generic_graphic_render(0, YRES * 2, XRES * ((cols - len) / 2), FG_COL, BG_COL, "norm", msg1);
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if (msg2 && rows >= 4) {
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unsigned int len = strlen(msg2);
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drv_generic_graphic_render(0, YRES * 3, XRES * ((cols - len) / 2), FG_COL, BG_COL, "norm", msg2);
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int drv_generic_graphic_draw(WIDGET * W)
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WIDGET_TEXT *Text = W->data;
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fg = W->fg_valid ? W->fg_color : FG_COL;
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bg = W->bg_valid ? W->bg_color : BG_COL;
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drv_generic_graphic_render(W->layer, YRES * W->row, XRES * W->col, fg, bg, P2S(&Text->style), Text->buffer);
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/****************************************/
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/*** generic icon handling ***/
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/****************************************/
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int drv_generic_graphic_icon_draw(WIDGET * W)
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WIDGET_ICON *Icon = W->data;
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unsigned char *bitmap = Icon->bitmap + YRES * Icon->curmap;
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fg = W->fg_valid ? W->fg_color : FG_COL;
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bg = W->bg_valid ? W->bg_color : BG_COL;
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if (layer < 0 || layer >= LAYERS) {
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error("%s: layer %d out of bounds (0..%d)", Driver, layer, LAYERS - 1);
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/* maybe grow layout framebuffer */
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drv_generic_graphic_resizeFB(row + YRES, col + XRES);
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visible = P2N(&Icon->visible) > 0;
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for (y = 0; y < YRES; y++) {
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int mask = 1 << XRES;
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for (x = 0; x < XRES; x++) {
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int i = (row + y) * LCOLS + col + x;
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if (bitmap[y] & mask)
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drv_generic_graphic_FB[layer][i] = fg;
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drv_generic_graphic_FB[layer][i] = bg;
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drv_generic_graphic_FB[layer][i] = BG_COL;
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drv_generic_graphic_blit(row, col, YRES, XRES);
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/****************************************/
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/*** generic bar handling ***/
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/****************************************/
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int drv_generic_graphic_bar_draw(WIDGET * W)
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WIDGET_BAR *Bar = W->data;
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int layer, row, col, len, res, rev, max, val1, val2;
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dir = Bar->direction;
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fg = W->fg_valid ? W->fg_color : FG_COL;
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bg = W->bg_valid ? W->bg_color : BG_COL;
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bar[0] = Bar->color_valid[0] ? Bar->color[0] : fg;
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bar[1] = Bar->color_valid[1] ? Bar->color[1] : fg;
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if (layer < 0 || layer >= LAYERS) {
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error("%s: layer %d out of bounds (0..%d)", Driver, layer, LAYERS - 1);
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/* maybe grow layout framebuffer */
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if (dir & (DIR_EAST | DIR_WEST)) {
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drv_generic_graphic_resizeFB(row + YRES, col + XRES * len);
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drv_generic_graphic_resizeFB(row + YRES * len, col + XRES);
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res = dir & (DIR_EAST | DIR_WEST) ? XRES : YRES;
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val1 = Bar->val1 * (double) (max);
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val2 = Bar->val2 * (double) (max);
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for (y = 0; y < YRES; y++) {
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int val = y < YRES / 2 ? val1 : val2;
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RGBA bc = y < YRES / 2 ? bar[0] : bar[1];
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for (x = 0; x < max; x++) {
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + x] = rev ? bg : bc;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + x] = rev ? bc : bg;
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drv_generic_graphic_FB[layer][(row + 0) * LCOLS + col + x] = fg;
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drv_generic_graphic_FB[layer][(row + YRES - 1) * LCOLS + col + x] = fg;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col] = fg;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + max - 1] = fg;
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for (x = 0; x < XRES; x++) {
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int val = x < XRES / 2 ? val1 : val2;
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RGBA bc = x < XRES / 2 ? bar[0] : bar[1];
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for (y = 0; y < max; y++) {
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + x] = rev ? bg : bc;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + x] = rev ? bc : bg;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + 0] = fg;
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drv_generic_graphic_FB[layer][(row + y) * LCOLS + col + XRES - 1] = fg;
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drv_generic_graphic_FB[layer][(row + 0) * LCOLS + col + x] = fg;
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drv_generic_graphic_FB[layer][(row + max - 1) * LCOLS + col + x] = fg;
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if (dir & (DIR_EAST | DIR_WEST)) {
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drv_generic_graphic_blit(row, col, YRES, XRES * len);
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drv_generic_graphic_blit(row, col, YRES * len, XRES);
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/****************************************/
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/*** generic image handling ***/
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/****************************************/
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int drv_generic_graphic_image_draw(WIDGET * W)
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WIDGET_IMAGE *Image = W->data;
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int layer, row, col, width, height;
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width = Image->width;
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height = Image->height;
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if (layer < 0 || layer >= LAYERS) {
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error("%s: layer %d out of bounds (0..%d)", Driver, layer, LAYERS - 1);
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/* if no size or no image at all, do nothing */
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if (width <= 0 || height <= 0 || Image->bitmap == NULL) {
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/* maybe grow layout framebuffer */
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drv_generic_graphic_resizeFB(row + height, col + width);
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visible = P2N(&Image->visible);
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for (y = 0; y < height; y++) {
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for (x = 0; x < width; x++) {
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int i = (row + y) * LCOLS + col + x;
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drv_generic_graphic_FB[layer][i] = Image->bitmap[y * width + x];
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drv_generic_graphic_FB[layer][i] = BG_COL;
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drv_generic_graphic_blit(row, col, height, width);
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/****************************************/
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/*** generic init/quit ***/
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/****************************************/
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int drv_generic_graphic_init(const char *section, const char *driver)
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Section = (char *) section;
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Driver = (char *) driver;
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/* init layout framebuffer */
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for (l = 0; l < LAYERS; l++)
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drv_generic_graphic_FB[l] = NULL;
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drv_generic_graphic_resizeFB(DROWS, DCOLS);
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for (l = 0; l < LAYERS; l++) {
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if (drv_generic_graphic_FB[l] == NULL) {
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error("%s: framebuffer could not be allocated: malloc() failed", Driver);
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/* init generic driver & register plugins */
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/* set default colors */
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color = cfg_get(Section, "foreground", "000000ff");
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if (color2RGBA(color, &FG_COL) < 0) {
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error("%s: ignoring illegal color '%s'", Driver, color);
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color = cfg_get(Section, "background", "ffffff00");
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if (color2RGBA(color, &BG_COL) < 0) {
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error("%s: ignoring illegal color '%s'", Driver, color);
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color = cfg_get(Section, "basecolor", "ffffff");
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if (color2RGBA(color, &BL_COL) < 0) {
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error("%s: ignoring illegal color '%s'", Driver, color);
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/* inverted display? */
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cfg_number(section, "inverted", 0, 0, 1, &INVERTED);
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/* register text widget */
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wc.draw = drv_generic_graphic_draw;
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widget_register(&wc);
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/* register icon widget */
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wc.draw = drv_generic_graphic_icon_draw;
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widget_register(&wc);
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/* register bar widget */
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wc.draw = drv_generic_graphic_bar_draw;
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widget_register(&wc);
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/* register image widget */
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wc.draw = drv_generic_graphic_image_draw;
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widget_register(&wc);
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/* clear framebuffer but do not blit to display */
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for (l = 0; l < LAYERS; l++)
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for (i = 0; i < LCOLS * LROWS; i++)
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drv_generic_graphic_FB[l][i] = NO_COL;
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int drv_generic_graphic_clear(void)
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for (l = 0; l < LAYERS; l++)
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for (i = 0; i < LCOLS * LROWS; i++)
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drv_generic_graphic_FB[l][i] = NO_COL;
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drv_generic_graphic_blit(0, 0, LROWS, LCOLS);
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RGBA drv_generic_graphic_rgb(const int row, const int col)
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return drv_generic_graphic_blend(row, col);
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unsigned char drv_generic_graphic_gray(const int row, const int col)
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RGBA p = drv_generic_graphic_blend(row, col);
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return (77 * p.R + 150 * p.G + 28 * p.B) / 255;
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unsigned char drv_generic_graphic_black(const int row, const int col)
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return drv_generic_graphic_gray(row, col) < 127;
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int drv_generic_graphic_quit(void)
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for (l = 0; l < LAYERS; l++) {
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if (drv_generic_graphic_FB[l]) {
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free(drv_generic_graphic_FB[l]);
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drv_generic_graphic_FB[l] = NULL;