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dia.c
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dia.c
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///
/// @file dia.c @brief dia show application functions
///
/// Copyright (c) 2009 - 2011 by Lutz Sammer. All Rights Reserved.
///
/// Contributor(s):
///
/// License: AGPLv3
///
/// This program is free software: you can redistribute it and/or modify
/// it under the terms of the GNU Affero General Public License as
/// published by the Free Software Foundation, either version 3 of the
/// License.
///
/// 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 Affero General Public License for more details.
///
/// $Id$
//////////////////////////////////////////////////////////////////////////////
///
/// @defgroup dia The dia show application module.
///
/// This module handles showing pictures. Didn't belongs into uwm,
/// but I needed a place to play around.
///
/// @todo keyboard handling is missing
/// @todo hide cursor
/// @todo recursive mode
/// @todo setting slide-show delay
/// @todo fullscreen zoom mode
/// @todo show commands in the areas
///
/// <tt>
/// .----------------v---------------------------------------v------.
/// | film | | | | | |
/// | roll | NWC | | | | NEC |
/// | | | | | | |
/// | }------' | | `------{
/// | | | | |
/// | | | | |
/// | | | | |
/// | | WS | FOTO | ES |
/// | | | | |
/// | | | | |
/// | | | | |
/// | |------. | | ,------|
/// | | | | | | |
/// | | NEC | | | | SEC |
/// | | | | | | |
/// `---------'------'---------------------------------------'------'
/// </tt>
///
/// @{
#define _GNU_SOURCE 1 ///< fix stpcpy strchrnul
#include <xcb/xcb.h>
#include "uwm.h"
#ifdef USE_DIA // {
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <xcb/xcb_icccm.h>
#include <xcb/xcb_atom.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_pixel.h>
#include <xcb/xcb_image.h>
#include "queue.h"
#include "core-array/core-array.h"
#include "core-rc/core-rc.h"
#include "misc.h"
#include "event.h"
#include "client.h"
#include "draw.h"
#include "image.h"
#include "hints.h"
#include "icon.h"
#include "dia.h"
// ------------------------------------------------------------------------ //
/// default film strip thumbnail width
#define DIA_FILM_STRIP_WIDTH 170
/// default film strip thumbnail height
#define DIA_FILM_STRIP_HEIGHT 96
/// default index thumbnail width
#define DIA_INDEX_WIDTH 170
/// default index thumbnail height
#define DIA_INDEX_HEIGHT 96
/// default corner command width
#define DIA_CORNER_WIDTH (170 / 2)
/// default corner command height
#define DIA_CORNER_HEIGHT (96 / 2)
#if 0
#define DIA_CACHE_SIZE 10
/**
** Thumbnail image cache.
*/
typedef struct _dia_cache_
{
const char *Name; ///< image file name
Icon *Icon; ///< icon image
} DiaCache;
#endif
/**
** Dia display layout mode.
*/
typedef enum _dia_layout_
{
DIA_LAYOUT_SINGLE, ///< single picture
DIA_LAYOUT_INDEX, ///< index page
} DiaLayout;
/**
** Dia global variables structure typedef.
*/
typedef struct _dia_ Dia;
/**
** Dia global variables structure.
*/
struct _dia_
{
xcb_window_t Window; ///< dia-show window
xcb_pixmap_t Pixmap; ///< current pixmap (double buffer)
xcb_pixmap_t Working; ///< working pixmap (double buffer)
uint16_t Width; ///< window width
uint16_t Height; ///< window height
uint16_t CornerWidth; ///< corner command area width
uint16_t CornerHeight; ///< corner command area height
uint16_t FilmStripWidth; ///< film-strip thumbnail width
uint16_t FilmStripHeight; ///< film-strip thumbnail height
uint16_t IndexWidth; ///< index-page thumbnail width
uint16_t IndexHeight; ///< index-page thumbnail height
uint16_t AspectNum; ///< thumbnail aspect ratio
uint16_t AspectDen; ///< thumbnail aspect ratio
uint16_t SlideShowDelay; ///< slide show delay
unsigned NeedRedraw:1; ///< need to redraw
unsigned SlideShow:1; ///< slide show running
unsigned IndexLabel:1; ///< print file names on thumbnails
DiaLayout Layout:1; ///< dia window layout
int FilmStrip:1; ///< flag show film strip
int Backdrop:1; ///< flag become desktop background
int Fullscreen:1; ///< flag become full-screen
uint32_t SlideShowTick; ///< last slide-show tick
uint32_t LastTime; ///< last handled event time
int16_t LastX; ///< last x-coordinate
int16_t LastY; ///< last y-coordinate
int State; ///< state for pointer buttons handle
int16_t OffsetX; ///< offset for slide effect
int16_t OffsetY; ///< offset for slide effect
char *Path; ///< current path
Array *FilesInDir; ///< files in directory
size_t CurrentIndex; ///< current file index
size_t FirstIndex; ///< first index of film-strip/index
// Array *DirTree; ///< directory tree
// DiaCache Cache[DIA_CACHE_SIZE]; ///< image cache
};
static Dia DiaVars[1]; ///< dia-show globals
// ------------------------------------------------------------------------ //
/**
** Filter for scandir, only image files.
**
** @param dirent current directory entry
**
** @returns true if the @p dirent is an image.
*/
static int DiaIsImage(const struct dirent *dirent)
{
if (dirent->d_type == DT_REG) { // only regular files
size_t len;
len = strlen(dirent->d_name); // only supported image files
if (len > 4 && (!strcasecmp(dirent->d_name + len - 4, ".jpg")
|| !strcasecmp(dirent->d_name + len - 4, ".png"))) {
return 1;
}
}
return 0;
}
/**
** Read directory in array.
**
** array[] -> names
**
** @param name directory name
**
** @returns array with only image file names.
*/
static Array *DiaDirNew(const char *name)
{
struct dirent **namelist;
Array *array;
size_t index;
int n;
int i;
array = ArrayNew();
n = scandir(name, &namelist, DiaIsImage, alphasort);
if (n > 0) {
index = 0;
for (i = 0; i < n; ++i) {
ArrayIns(&array, index++, (size_t) strdup(namelist[i]->d_name));
free(namelist[i]);
}
free(namelist);
} else {
printf("Can't scan dir '%s'\n", name);
}
return array;
}
/**
** Free directory array.
**
** @param array array with malloced strings
*/
static void DiaDirDel(Array * array)
{
size_t index;
size_t *value;
index = 0;
value = ArrayFirst(array, &index);
while (value) {
free((char *)*value);
value = ArrayNext(array, &index);
}
ArrayFree(array);
}
// ------------------------------------------------------------------------ //
#if 0
/**
** Get the scaled size of an icon for dia.
*/
static void DiaScaledIconSize(const Icon * icon, unsigned max_width,
unsigned max_height, unsigned *width, unsigned *height)
{
unsigned long ratio;
// width to height
ratio = (unsigned long)(icon->Image->Width * 65536) / icon->Image->Height;
if (icon->Image->Width > icon->Image->Height) { // compute size wrt width
*width = (max_width * ratio) / 65536;
*height = (*width * 65536) / ratio;
} else { // compute size wrt height
*height = (max_height * 65536) / ratio;
*width = (*height * ratio) / 65536;
}
}
#endif
/**
** Draw image.
**
** @param image image to render
** @param x x-offset on drawable to render image
** @param y y-offset on drawable to render image
** @param width width of image to display
** @param height height of image to display
**
** @see IconDraw
**
** @todo use shared memory, cache image
*/
static void DiaDrawImage(const Image * image, int x, int y, unsigned width,
unsigned height)
{
xcb_image_t *xcb_image;
unsigned scale_x;
unsigned scale_y;
unsigned src_x;
unsigned src_y;
unsigned dst_x;
unsigned dst_y;
const uint8_t *argb;
// create a temporary xcb_image for scaling
xcb_image =
xcb_image_create_native(Connection, width, height,
(XcbScreen->root_depth == 1)
? XCB_IMAGE_FORMAT_XY_BITMAP : XCB_IMAGE_FORMAT_Z_PIXMAP,
XcbScreen->root_depth, NULL, 0L, NULL);
// determine scale factor
scale_x = (65536 * image->Width) / width;
scale_y = (65536 * image->Height) / height;
argb = image->Data;
src_y = 0;
// fast 32bit versions
if (xcb_image->bpp == 32) {
if (xcb_image->byte_order == XCB_IMAGE_ORDER_LSB_FIRST) {
for (dst_y = 0; dst_y < height; dst_y++) {
int n;
n = (src_y / 65536) * image->Width;
src_x = 0;
for (dst_x = 0; dst_x < width; dst_x++) {
int i;
xcb_coloritem_t color;
i = 4 * (n + (src_x / 65536));
color.red = (65535 * (argb[i + 1]) / 255);
color.green = (65535 * (argb[i + 2]) / 255);
color.blue = (65535 * (argb[i + 3]) / 255);
ColorGetPixel(&color);
xcb_image_put_pixel_Z32L(xcb_image, dst_x, dst_y,
color.pixel);
src_x += scale_x;
}
src_y += scale_y;
}
} else {
for (dst_y = 0; dst_y < height; dst_y++) {
int n;
n = (src_y / 65536) * image->Width;
src_x = 0;
for (dst_x = 0; dst_x < width; dst_x++) {
int i;
xcb_coloritem_t color;
i = 4 * (n + (src_x / 65536));
color.red = (65535 * (argb[i + 1]) / 255);
color.green = (65535 * (argb[i + 2]) / 255);
color.blue = (65535 * (argb[i + 3]) / 255);
ColorGetPixel(&color);
xcb_image_put_pixel_Z32M(xcb_image, dst_x, dst_y,
color.pixel);
src_x += scale_x;
}
src_y += scale_y;
}
}
// fast 24bit versions
} else if (xcb_image->bpp == 24) {
for (dst_y = 0; dst_y < height; dst_y++) {
int n;
n = (src_y / 65536) * image->Width;
src_x = 0;
for (dst_x = 0; dst_x < width; dst_x++) {
int i;
xcb_coloritem_t color;
uint8_t *row;
i = 4 * (n + (src_x / 65536));
color.red = (65535 * (argb[i + 1]) / 255);
color.green = (65535 * (argb[i + 2]) / 255);
color.blue = (65535 * (argb[i + 3]) / 255);
ColorGetPixel(&color);
row = xcb_image->data + (dst_y * xcb_image->stride);
switch (xcb_image->byte_order) {
case XCB_IMAGE_ORDER_LSB_FIRST:
row[dst_x * 3] = color.pixel;
row[dst_x * 3 + 1] = color.pixel >> 8;
row[dst_x * 3 + 2] = color.pixel >> 16;
break;
case XCB_IMAGE_ORDER_MSB_FIRST:
row[dst_x * 3] = color.pixel >> 16;
row[dst_x * 3 + 1] = color.pixel >> 8;
row[dst_x * 3 + 2] = color.pixel;
break;
}
src_x += scale_x;
}
src_y += scale_y;
}
} else {
for (dst_y = 0; dst_y < height; dst_y++) {
int n;
n = (src_y / 65536) * image->Width;
src_x = 0;
for (dst_x = 0; dst_x < width; dst_x++) {
int i;
xcb_coloritem_t color;
i = 4 * (n + (src_x / 65536));
color.red = (65535 * (argb[i + 1]) / 255);
color.green = (65535 * (argb[i + 2]) / 255);
color.blue = (65535 * (argb[i + 3]) / 255);
ColorGetPixel(&color);
xcb_image_put_pixel(xcb_image, dst_x, dst_y, color.pixel);
src_x += scale_x;
}
src_y += scale_y;
}
}
// render xcb_image to window
xcb_image_put(Connection, DiaVars->Working, RootGC, xcb_image, x, y, 0);
// release xcb_image
xcb_image_destroy(xcb_image);
}
/**
** Draw image,
**
** @param icon icon to render
** @param x x-offset on drawable to render icon
** @param y y-offset on drawable to render icon
** @param width width of icon to display
** @param height height of icon to display
*/
void DiaDrawIcon(Icon * icon, int x, int y, unsigned width, unsigned height)
{
// draw icon on window
IconDraw(icon, DiaVars->Working, x, y, width, height);
}
/**
** Show image.
**
** @param name file name of image to draw
** @param x x-offset on drawable to render image
** @param y y-offset on drawable to render image
** @param width width of image to display
** @param height height of image to display
**
** @todo cache images, can use icon cache
*/
void DiaShowImage(const char *name, int x, int y, unsigned width,
unsigned height)
{
Icon *icon;
// load icon
if (!(icon = IconLoadSuffixed(DiaVars->Path, name, ""))) {
Warning("dia image not found: \"%s\"", name);
return;
}
DiaDrawIcon(icon, x, y, width, height);
// we don't need icon anymore
IconDel(icon);
}
/**
** Show thumbnail.
**
** Short cut for thumbnails
**
** @param name file name of thumnail to draw
** @param x x-offset on drawable to thumnail image
** @param y y-offset on drawable to thumnail image
** @param width width of thumnail to display
** @param height height of thumnail to display
**
** @todo cache thumbnails
*/
void DiaShowThumbnail(const char *name, int x, int y, unsigned width,
unsigned height)
{
Image *image;
char *buf;
buf = alloca(strlen(name) + strlen(DiaVars->Path) + 2);
stpcpy(stpcpy(stpcpy(buf, DiaVars->Path), "/"), name);
if ((image = ImageLoadJPEG0(buf, width, height))) {
int i;
unsigned w;
unsigned h;
// keep image aspect ratio
i = (image->Width * 65536) / image->Height;
w = MIN(width * 65536, height * i);
h = MIN(height, w / i);
w = (h * i) / 65536;
if (w < 1) {
w = 1;
}
if (h < 1) {
h = 1;
}
DiaDrawImage(image, x + (width - w) / 2, y + (height - h) / 2, w, h);
ImageDel(image);
} else {
DiaShowImage(name, x, y, width, height);
}
}
/**
** Draw vertical film strip.
*/
static void DiaDrawVerticalFilmStrip(void)
{
int x;
int y;
size_t index;
size_t *value;
x = 0;
y = 0;
index = DiaVars->FirstIndex;
value = ArrayFirst(DiaVars->FilesInDir, &index);
do {
const char *file;
if (!value) {
break;
}
file = (const char *)*value;
if (!file) {
break;
}
// highlight current file
if (index == DiaVars->CurrentIndex) {
xcb_rectangle_t rectangle;
rectangle.x = x;
rectangle.y = y;
rectangle.width = DiaVars->FilmStripWidth;
rectangle.height = DiaVars->FilmStripHeight;
xcb_change_gc(Connection, RootGC, XCB_GC_FOREGROUND,
&Colors.PanelFG.Pixel);
xcb_poly_fill_rectangle(Connection, DiaVars->Working, RootGC, 1,
&rectangle);
}
DiaShowThumbnail(file, x + 1, y + 1, DiaVars->FilmStripWidth - 2,
DiaVars->FilmStripHeight - 2);
if (DiaVars->IndexLabel) {
FontDrawString(DiaVars->Working, &Fonts.Panel, 0UL, x + 2, y + 2,
DiaVars->FilmStripWidth - 3, NULL, file);
FontDrawString(DiaVars->Working, &Fonts.Panel,
Colors.PanelFG.Pixel, x + 1, y + 1,
DiaVars->FilmStripWidth - 4, NULL, file);
}
value = ArrayNext(DiaVars->FilesInDir, &index);
y += DiaVars->FilmStripHeight;
} while (y < DiaVars->Height);
}
/**
** Draw single image.
**
** Single image with or without film strip.
*/
static void DiaDrawSingle(void)
{
int x;
int y;
const char *file;
x = 0;
y = 0;
if (DiaVars->FilmStrip) {
// FIXME: no need to redraw film-strip, if already in backstore
DiaDrawVerticalFilmStrip();
x = DiaVars->FilmStripWidth;
}
file = (const char *)ArrayGet(DiaVars->FilesInDir, DiaVars->CurrentIndex);
if (file) {
int ox;
int oy;
int w;
int h;
// FIXME: set clipping
w = DiaVars->Width - x;
h = DiaVars->Height - y;
ox = DiaVars->OffsetX;
oy = DiaVars->OffsetY;
DiaShowImage(file, x + ox, y + oy, w, h);
}
}
/**
** Draw index page.
*/
static void DiaDrawIndex(void)
{
int x;
int y;
size_t index;
size_t *value;
index = DiaVars->FirstIndex;
value = ArrayFirst(DiaVars->FilesInDir, &index);
// center index
y = (DiaVars->Height % DiaVars->IndexHeight) / 2;
do {
x = (DiaVars->Width % DiaVars->IndexWidth) / 2;
do {
if (value) {
const char *file;
file = (const char *)*value;
if (!file) {
break;
}
// highlight current file
if (index == DiaVars->CurrentIndex) {
xcb_rectangle_t rectangle;
rectangle.x = x;
rectangle.y = y;
rectangle.width = DiaVars->IndexWidth;
rectangle.height = DiaVars->IndexHeight;
xcb_change_gc(Connection, RootGC, XCB_GC_FOREGROUND,
&Colors.PanelFG.Pixel);
xcb_poly_fill_rectangle(Connection, DiaVars->Working,
RootGC, 1, &rectangle);
}
DiaShowThumbnail(file, x + 1, y + 1, DiaVars->IndexWidth - 2,
DiaVars->IndexHeight - 2);
if (DiaVars->IndexLabel) {
FontDrawString(DiaVars->Working, &Fonts.Panel, 0UL, x + 2,
y + 2, DiaVars->IndexWidth - 3, NULL, file);
FontDrawString(DiaVars->Working, &Fonts.Panel,
Colors.PanelFG.Pixel, x + 1, y + 1,
DiaVars->IndexWidth - 4, NULL, file);
}
value = ArrayNext(DiaVars->FilesInDir, &index);
}
x += DiaVars->IndexWidth;
} while (x <= DiaVars->Width - DiaVars->IndexWidth);
y += DiaVars->IndexHeight;
} while (y <= DiaVars->Height - DiaVars->IndexHeight);
}
/**
** Draw dia.
**
** Modes:
** - 1 picture
** - film roll + 1 picture
** - n x m pictures
**
** @param expose true called from expose event.
*/
static void DiaDrawWindow(int expose)
{
uint32_t values[1];
xcb_rectangle_t rectangle;
if (IsNextEventAvail()) {
DiaVars->NeedRedraw = 1;
return;
}
if (expose) {
xcb_aux_clear_window(Connection, DiaVars->Window);
return;
}
DiaVars->NeedRedraw = 0;
// clear with background
xcb_change_gc(Connection, RootGC, XCB_GC_FOREGROUND,
&Colors.PanelBG.Pixel);
rectangle.x = 0;
rectangle.y = 0;
rectangle.width = DiaVars->Width;
rectangle.height = DiaVars->Height;
xcb_poly_fill_rectangle(Connection, DiaVars->Working, RootGC, 1,
&rectangle);
if (DiaVars->Layout == DIA_LAYOUT_SINGLE) {
DiaDrawSingle();
} else {
DiaDrawIndex();
}
// swap pixmaps
values[0] = DiaVars->Working;
xcb_change_window_attributes(Connection, DiaVars->Window,
XCB_CW_BACK_PIXMAP, values);
// FIXME: wait v-sync
xcb_aux_clear_window(Connection, DiaVars->Window);
DiaVars->Working = DiaVars->Pixmap;
DiaVars->Pixmap = values[0];
}
/**
** Close and destroy dia show window.
*/
static void DiaDestroy(void)
{
Client *client;
// remove frame
if ((client = ClientFindByChild(DiaVars->Window))) {
ClientDelWindow(client);
}
free(DiaVars->Path);
DiaVars->Path = NULL;
DiaDirDel(DiaVars->FilesInDir);
DiaVars->FilesInDir = NULL;
xcb_destroy_window(Connection, DiaVars->Window);
DiaVars->Window = XCB_NONE;
xcb_free_pixmap(Connection, DiaVars->Pixmap);
DiaVars->Pixmap = XCB_NONE;
xcb_free_pixmap(Connection, DiaVars->Working);
DiaVars->Working = XCB_NONE;
}
/**
** Create the dia show window.
**
** @param name start file or directory.
*/
void DiaCreate(const char *name)
{
uint32_t values[2];
xcb_window_t window;
xcb_size_hints_t size_hints;
int x;
int y;
int width;
int height;
Client *self;
if (DiaVars->Window) { // already running
DiaDestroy();
return;
}
DiaVars->Path = ExpandPath(name);
DiaVars->FilesInDir = DiaDirNew(DiaVars->Path);
DiaVars->CurrentIndex = DiaVars->FirstIndex = 0;
DiaVars->NeedRedraw = 0;
DiaVars->State = 0;
if (DiaVars->Fullscreen) { // fullscreen mode
x = 0;
y = 0;
width = XcbScreen->width_in_pixels;
height = XcbScreen->height_in_pixels;
} else { // window mode
x = XcbScreen->width_in_pixels / 8;
y = XcbScreen->height_in_pixels / 8;
width = (XcbScreen->width_in_pixels * 3) / 4;
height = (XcbScreen->height_in_pixels * 3) / 4;
}
window = xcb_generate_id(Connection);
values[0] =
XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
XCB_EVENT_MASK_POINTER_MOTION | XCB_EVENT_MASK_EXPOSURE;
xcb_create_window(Connection, XCB_COPY_FROM_PARENT, window,
XcbScreen->root, x, y, width, height, 0, XCB_WINDOW_CLASS_INPUT_OUTPUT,
XCB_COPY_FROM_PARENT, XCB_CW_EVENT_MASK, values);
// display pixmap
DiaVars->Pixmap = xcb_generate_id(Connection);
xcb_create_pixmap(Connection, XcbScreen->root_depth, DiaVars->Pixmap,
window, width, height);
// working pixmap
DiaVars->Working = xcb_generate_id(Connection);
xcb_create_pixmap(Connection, XcbScreen->root_depth, DiaVars->Working,
window, width, height);
size_hints.flags = 0;
xcb_size_hints_set_position(&size_hints, 0, x, y);
xcb_set_wm_size_hints(Connection, window, WM_NORMAL_HINTS, &size_hints);
xcb_set_wm_name(Connection, window, STRING, sizeof("Diashow") - 1,
"Diashow");
if (DiaVars->Fullscreen) { // fullscreen mode
values[0] = Atoms.NET_WM_STATE_FULLSCREEN.Atom;
xcb_change_property(Connection, XCB_PROP_MODE_REPLACE, window,
Atoms.NET_WM_STATE.Atom, ATOM, 32, 1, &values);
}
#if 1
if (1) {
self =
ClientAddWindow(window,
xcb_get_window_attributes_unchecked(Connection, window), 0, 0);
// resize not supported yet
self->State |= WM_STATE_WMDIALOG;
ClientFocus(self);
// need to grab button, but i don't know why
// otherwise its freeze on first button click
xcb_grab_button(Connection, 1, window,
XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE,
XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, XCB_NONE, XCB_NONE,
XCB_GRAB_ANY, XCB_BUTTON_MASK_ANY);
}
#endif
DiaVars->OffsetX = 0;
DiaVars->OffsetY = 0;
DiaVars->Height = height;
DiaVars->Width = width;
DiaVars->Window = window;
if (DiaVars->Backdrop) {
// lower window
values[0] = XCB_STACK_MODE_BELOW;
xcb_configure_window(Connection, DiaVars->Window,
XCB_CONFIG_WINDOW_STACK_MODE, values);
}
xcb_map_window(Connection, window);
DiaDrawWindow(0); // release button event, cancels this
DiaVars->SlideShowTick = GetMsTicks() + DiaVars->SlideShowDelay * 1000;
}
/**
** First dia image.
*/
static void DiaFirst(void)
{
size_t index;
size_t *value;
index = 0;
value = ArrayFirst(DiaVars->FilesInDir, &index);
if (value) {
DiaVars->CurrentIndex = index;
DiaVars->FirstIndex = index;
DiaDrawWindow(0);
}
}
/**
** Previous dia image.
*/
static void DiaPrev(void)
{
size_t index;
size_t *value;
index = DiaVars->CurrentIndex;
value = ArrayPrev(DiaVars->FilesInDir, &index);
if (value) {
DiaVars->CurrentIndex = index;
if (DiaVars->CurrentIndex < DiaVars->FirstIndex) {
int n;
n = DiaVars->Height / DiaVars->FilmStripHeight;
// Move start of index
index = DiaVars->FirstIndex;
while (n--) {
value = ArrayPrev(DiaVars->FilesInDir, &index);
if (!value) {
break;
}
}
DiaVars->FirstIndex = index;
}
DiaDrawWindow(0);
}
}
/**
** Next dia image.
*/
static void DiaNext(void)
{
size_t index;
size_t *value;
index = DiaVars->CurrentIndex;
value = ArrayNext(DiaVars->FilesInDir, &index);
if (value) {
int n;
DiaVars->CurrentIndex = index;
n = DiaVars->Height / DiaVars->FilmStripHeight;
if (DiaVars->CurrentIndex >= DiaVars->FirstIndex + n) {
int i;
index = DiaVars->FirstIndex + n - 1;
// Look how far we can move the end
for (i = 0; i < n; ++i) {
value = ArrayNext(DiaVars->FilesInDir, &index);
if (!value) {
break;
}
}
// Move start of index
index = DiaVars->FirstIndex;
while (i--) {
value = ArrayNext(DiaVars->FilesInDir, &index);
if (!value) {
break;
}
}
DiaVars->FirstIndex = index;
}
DiaDrawWindow(0);
}
}
/**
** Scroll film strip up
*/
static void DiaScrollUp(void)
{
size_t index;
// Move start of index
index = DiaVars->FirstIndex;
if (ArrayPrev(DiaVars->FilesInDir, &index)) {
DiaVars->FirstIndex = index;
}
DiaPrev();
}
/**
** Scroll film strip down
*/
static void DiaScrollDown(void)
{
size_t index;
// Move end of index
index =
DiaVars->FirstIndex + DiaVars->Height / DiaVars->FilmStripHeight - 1;
if (ArrayNext(DiaVars->FilesInDir, &index)) {
index = DiaVars->FirstIndex;
ArrayNext(DiaVars->FilesInDir, &index);
DiaVars->FirstIndex = index;
}
DiaNext();
}
/**
** Dia scroll index page up.
*/
static void DiaIndexScrollUp(int n)
{
int i;
size_t *value;