/* $Id$ * $URL$ * * image widget handling * * Copyright (C) 2006 Michael Reinelt <michael@reinelt.co.at> * Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * 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, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ /* * exported functions: * * WIDGET_CLASS Widget_Image * the image widget * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include <ctype.h> #include <errno.h> #ifdef HAVE_GD_GD_H #include <gd/gd.h> #else #ifdef HAVE_GD_H #include <gd.h> #else #error "gd.h not found!" #error "cannot compile image widget" #endif #endif #if GD2_VERS != 2 #error "lcd4linux requires libgd version 2" #error "cannot compile image widget" #endif #include "debug.h" #include "cfg.h" #include "qprintf.h" #include "property.h" #include "timer.h" #include "widget.h" #include "widget_image.h" #include "rgb.h" #ifdef WITH_DMALLOC #include <dmalloc.h> #endif static void widget_image_render(const char *Name, WIDGET_IMAGE * Image) { int x, y; int inverted; gdImagePtr gdImage; /* clear bitmap */ if (Image->bitmap) { int i; for (i = 0; i < Image->height * Image->width; i++) { RGBA empty = {.R = 0x00,.G = 0x00,.B = 0x00,.A = 0x00 }; Image->bitmap[i] = empty; } } /* reload image only on first call or on explicit reload request */ if (Image->gdImage == NULL || P2N(&Image->reload)) { char *file; FILE *fd; /* free previous image */ if (Image->gdImage) { gdImageDestroy(Image->gdImage); Image->gdImage = NULL; } file = P2S(&Image->file); if (file == NULL || file[0] == '\0') { error("Warning: Image %s has no file", Name); return; } fd = fopen(file, "rb"); if (fd == NULL) { error("Warning: Image %s: fopen(%s) failed: %s", Name, file, strerror(errno)); return; } Image->gdImage = gdImageCreateFromPng(fd); fclose(fd); if (Image->gdImage == NULL) { error("Warning: Image %s: CreateFromPng(%s) failed!", Name, file); return; } } /* maybe resize bitmap */ gdImage = Image->gdImage; if (gdImage->sx > Image->width) { Image->width = gdImage->sx; free(Image->bitmap); Image->bitmap = NULL; } if (gdImage->sy > Image->height) { Image->height = gdImage->sy; free(Image->bitmap); Image->bitmap = NULL; } if (Image->bitmap == NULL && Image->width > 0 && Image->height > 0) { int i = Image->width * Image->height * sizeof(Image->bitmap[0]); Image->bitmap = malloc(i); if (Image->bitmap == NULL) { error("Warning: Image %s: malloc(%d) failed: %s", Name, i, strerror(errno)); return; } for (i = 0; i < Image->height * Image->width; i++) { RGBA empty = {.R = 0x00,.G = 0x00,.B = 0x00,.A = 0x00 }; Image->bitmap[i] = empty; } } /* finally really render it */ inverted = P2N(&Image->inverted); if (P2N(&Image->visible)) { for (x = 0; x < gdImage->sx; x++) { for (y = 0; y < gdImage->sy; y++) { int p = gdImageGetTrueColorPixel(gdImage, x, y); int a = gdTrueColorGetAlpha(p); int i = y * Image->width + x; Image->bitmap[i].R = gdTrueColorGetRed(p); Image->bitmap[i].G = gdTrueColorGetGreen(p); Image->bitmap[i].B = gdTrueColorGetBlue(p); /* GD's alpha is 0 (opaque) to 127 (tranparanet) */ /* our alpha is 0 (transparent) to 255 (opaque) */ Image->bitmap[i].A = (a == 127) ? 0 : 255 - 2 * a; if (inverted) { Image->bitmap[i].R = 255 - Image->bitmap[i].R; Image->bitmap[i].G = 255 - Image->bitmap[i].G; Image->bitmap[i].B = 255 - Image->bitmap[i].B; } } } } } static void widget_image_update(void *Self) { WIDGET *W = (WIDGET *) Self; WIDGET_IMAGE *Image = W->data; /* process the parent only */ if (W->parent == NULL) { /* evaluate properties */ property_eval(&Image->file); property_eval(&Image->update); property_eval(&Image->reload); property_eval(&Image->visible); property_eval(&Image->inverted); /* render image into bitmap */ widget_image_render(W->name, Image); } /* finally, draw it! */ if (W->class->draw) W->class->draw(W); /* add a new one-shot timer */ if (P2N(&Image->update) > 0) { timer_add(widget_image_update, Self, P2N(&Image->update), 1); } } int widget_image_init(WIDGET * Self) { char *section; WIDGET_IMAGE *Image; /* re-use the parent if one exists */ if (Self->parent == NULL) { /* prepare config section */ /* strlen("Widget:")=7 */ section = malloc(strlen(Self->name) + 8); strcpy(section, "Widget:"); strcat(section, Self->name); Image = malloc(sizeof(WIDGET_IMAGE)); memset(Image, 0, sizeof(WIDGET_IMAGE)); /* initial size */ Image->width = 0; Image->height = 0; Image->bitmap = NULL; /* load properties */ property_load(section, "file", NULL, &Image->file); property_load(section, "update", "100", &Image->update); property_load(section, "reload", "0", &Image->reload); property_load(section, "visible", "1", &Image->visible); property_load(section, "inverted", "0", &Image->inverted); /* sanity checks */ if (!property_valid(&Image->file)) { error("Warning: widget %s has no file", section); } free(section); Self->data = Image; Self->x2 = Self->col + Image->width; Self->y2 = Self->row + Image->height; } else { /* re-use the parent */ Self->data = Self->parent->data; } /* just do it! */ widget_image_update(Self); return 0; } int widget_image_quit(WIDGET * Self) { if (Self) { /* do not deallocate child widget! */ if (Self->parent == NULL) { if (Self->data) { WIDGET_IMAGE *Image = Self->data; if (Image->gdImage) { gdImageDestroy(Image->gdImage); Image->gdImage = NULL; } free(Image->bitmap); property_free(&Image->file); property_free(&Image->update); property_free(&Image->reload); property_free(&Image->visible); property_free(&Image->inverted); free(Self->data); Self->data = NULL; } } } return 0; } WIDGET_CLASS Widget_Image = { .name = "image", .type = WIDGET_TYPE_XY, .init = widget_image_init, .draw = NULL, .quit = widget_image_quit, };