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+/* $Id: widget_image.c 1106 2010-02-07 14:03:46Z mzuther $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/widget_image.c $
+ *
+ * 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_group.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(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,
+};
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