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rockbox/apps/plugins/ppmviewer.c
Nils Wallménius 01729e7a18 FS#9281 Rename of splash functions. 
* Remove gui_splash()
* Rename gui_syncsplash() to splashf() and remove its voice 
capabilities.
* Rename the internal splash() to splash_internal() and introduce an 
externally visible splash() that handles simple splashing  without 
printf functionality e.g. splash(HZ, ID2P(LANG_FOO)); or splash(HZ, 
"foo"); if a LANG_* id is passed it will be voiced.
* Adjust all places that called gui_syncsplash() to use the correct 
variant from above.
* Export both new functions to plugins and adjust places calling 
rb->splash() to use the correct variant so that we now have naming 
consistency between the core and plugins.
* Fix one latent bug that would cause my sim to crash with the above 
changes and correct P2STR and P2ID macros, thanks to pondlife.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18282 a1c6a512-1295-4272-9138-f99709370657
2008-08-15 08:27:39 +00:00

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/*****************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// __ \_/ ___\| |/ /| __ \ / __ \ \/ /
* Jukebox | | ( (__) ) \___| ( | \_\ ( (__) ) (
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 Alexander Papst
*
* 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
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "bmp.h"
#if defined(HAVE_LCD_COLOR)
PLUGIN_HEADER
/* Magic constants. */
#define PPM_MAGIC1 'P'
#define PPM_MAGIC2 '3'
#define RPPM_MAGIC2 '6'
#define PPM_FORMAT (PPM_MAGIC1 * 256 + PPM_MAGIC2)
#define RPPM_FORMAT (PPM_MAGIC1 * 256 + RPPM_MAGIC2)
#define PPM_OVERALLMAXVAL 65535
#define PPM_MAXSIZE (300*1024)/sizeof(fb_data)
#define ppm_error(...) rb->splashf(HZ*2, __VA_ARGS__ )
static fb_data buffer[PPM_MAXSIZE];
static fb_data lcd_buf[LCD_WIDTH * LCD_HEIGHT];
static const struct plugin_api* rb; /* global api struct pointer */
int ppm_read_magic_number(int fd)
{
char i1, i2;
if(!rb->read(fd, &i1, 1) || !rb->read(fd, &i2, 1))
{
ppm_error( "Error reading magic number from ppm image stream. "\
"Most often, this means your input file is empty." );
return PLUGIN_ERROR;
}
return i1 * 256 + i2;
}
char ppm_getc(int fd)
{
char ch;
if (!rb->read(fd, &ch, 1)) {
ppm_error("EOF. Read error reading a byte");
return PLUGIN_ERROR;
}
if (ch == '#') {
do {
if (!rb->read(fd, &ch, 1)) {
ppm_error("EOF. Read error reading a byte");
return PLUGIN_ERROR;
}
} while (ch != '\n' && ch != '\r');
}
return ch;
}
int ppm_getuint(int fd)
{
char ch;
int i;
int digitVal;
do {
ch = ppm_getc(fd);
} while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r');
if (ch < '0' || ch > '9') {
ppm_error("Junk (%c) in file where an integer should be.", ch);
return PLUGIN_ERROR;
}
i = 0;
do {
digitVal = ch - '0';
if (i > INT_MAX/10 - digitVal) {
ppm_error("ASCII decimal integer in file is "\
"too large to be processed.");
return PLUGIN_ERROR;
}
i = i * 10 + digitVal;
ch = ppm_getc(fd);
} while (ch >= '0' && ch <= '9');
return i;
}
int ppm_getrawbyte(int fd)
{
unsigned char by;
if (!rb->read(fd, &by, 1)) {
ppm_error("EOF. Read error while reading a one-byte sample.");
return PLUGIN_ERROR;
}
return (int)by;
}
int ppm_getrawsample(int fd, int const maxval)
{
if (maxval < 256) {
/* The sample is just one byte. Read it. */
return(ppm_getrawbyte(fd));
} else {
/* The sample is two bytes. Read both. */
unsigned char byte_pair[2];
if (!rb->read(fd, byte_pair, 2)) {
ppm_error("EOF. Read error while reading a long sample.");
return PLUGIN_ERROR;
}
return((byte_pair[0]<<8) | byte_pair[1]);
}
}
int read_ppm_init_rest(int fd,
int * const cols,
int * const rows,
int * const maxval)
{
/* Read size. */
*cols = ppm_getuint(fd);
*rows = ppm_getuint(fd);
if ((long unsigned int)(*cols * *rows) > PPM_MAXSIZE) {
ppm_error("Imagesize (%ld pixels) is too large. "\
"The maximum allowed is %ld.",
(long unsigned int)(*cols * *rows),
(long unsigned int)PPM_MAXSIZE);
return PLUGIN_ERROR;
}
/* Read maxval. */
*maxval = ppm_getuint(fd);
if (*maxval > PPM_OVERALLMAXVAL) {
ppm_error("maxval of input image (%u) is too large. "\
"The maximum allowed by the PPM is %u.",
*maxval, PPM_OVERALLMAXVAL);
return PLUGIN_ERROR;
}
if (*maxval == 0) {
ppm_error("maxval of input image is zero.");
return PLUGIN_ERROR;
}
return 1;
}
void read_ppm_init(int fd,
int * const cols,
int * const rows,
int * const maxval,
int * const format)
{
/* Check magic number. */
*format = ppm_read_magic_number( fd );
if (*format == PLUGIN_ERROR) return;
switch (*format) {
case PPM_FORMAT:
case RPPM_FORMAT:
if(read_ppm_init_rest(fd, cols, rows, maxval) == PLUGIN_ERROR) {
*format = PLUGIN_ERROR;
}
break;
default:
ppm_error( "Bad magic number - not a ppm or rppm file." );
*format = PLUGIN_ERROR;
}
}
int read_ppm_row(int fd,
int const row,
int const cols,
int const maxval,
int const format)
{
int col;
int r, g, b;
switch (format) {
case PPM_FORMAT:
for (col = 0; col < cols; ++col) {
r = ppm_getuint(fd);
g = ppm_getuint(fd);
b = ppm_getuint(fd);
if (r == PLUGIN_ERROR || g == PLUGIN_ERROR ||
b == PLUGIN_ERROR)
{
return PLUGIN_ERROR;
}
buffer[(cols * row) + col] = LCD_RGBPACK(
(255 / maxval) * r,
(255 / maxval) * g,
(255 / maxval) * b);
}
break;
case RPPM_FORMAT:
for (col = 0; col < cols; ++col) {
r = ppm_getrawsample(fd, maxval);
g = ppm_getrawsample(fd, maxval);
b = ppm_getrawsample(fd, maxval);
if (r == PLUGIN_ERROR || g == PLUGIN_ERROR ||
b == PLUGIN_ERROR)
{
return PLUGIN_ERROR;
}
buffer[(cols * row) + col] = LCD_RGBPACK(
(255 / maxval) * r,
(255 / maxval) * g,
(255 / maxval) * b);
}
break;
default:
ppm_error("What?!");
return PLUGIN_ERROR;
}
return 1;
}
int read_ppm(int fd,
int * const cols,
int * const rows,
int * const maxval)
{
int row;
int format;
read_ppm_init(fd, cols, rows, maxval, &format);
if(format == PLUGIN_ERROR) {
return PLUGIN_ERROR;
}
for (row = 0; row < *rows; ++row) {
if( read_ppm_row(fd, row, *cols, *maxval, format) == PLUGIN_ERROR) {
return PLUGIN_ERROR;
}
}
return 1;
}
/* this is the plugin entry point */
enum plugin_status plugin_start(const struct plugin_api* api, const void* parameter)
{
static char filename[MAX_PATH];
int fd;
int cols;
int rows;
int maxval;
int result;
struct bitmap small_bitmap, orig_bitmap;
if(!parameter) return PLUGIN_ERROR;
rb = api;
rb->strcpy(filename, parameter);
fd = rb->open(filename, O_RDONLY);
if (fd < 0)
{
ppm_error("Couldnt open file: %s, %d", filename, fd);
return PLUGIN_ERROR;
}
result = read_ppm(fd, &cols, &rows, &maxval);
rb->close(fd);
if(result == PLUGIN_ERROR) return PLUGIN_ERROR;
orig_bitmap.width = cols;
orig_bitmap.height = rows;
orig_bitmap.data = (char*)buffer;
if (cols > LCD_WIDTH || rows > LCD_HEIGHT)
{
if (cols > LCD_WIDTH) {
small_bitmap.width = LCD_WIDTH;
small_bitmap.height =
(int)(((float)LCD_WIDTH / (float)cols) * (float)rows);
} else { /* rows > LCD_HEIGHT */
small_bitmap.width =
(int)(((float)LCD_HEIGHT / (float)rows) * (float)cols);
small_bitmap.height = LCD_HEIGHT;
}
small_bitmap.data = (char*)lcd_buf;
smooth_resize_bitmap( &orig_bitmap, &small_bitmap );
rb->lcd_bitmap((fb_data*)small_bitmap.data, 0, 0,
small_bitmap.width, small_bitmap.height);
} else {
rb->lcd_bitmap((fb_data*)orig_bitmap.data, 0, 0, cols, rows);
}
rb->lcd_update();
rb->button_get(true);
return PLUGIN_OK;
}
#endif
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