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rockbox/apps/recorder/bmp.h
Thomas Martitz f443e7bbf7 Support for transparency in 32bit bitmaps on color targets. 
This uses the alpha blending capabilities introduced with anti-aliased fonts
to draw bitmaps with transparency information. The bmp loader is extended to read
this information (pass FORMAT_TRANSPARENT in format). The alpha information will
be used when drawing the bitmap.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30937 a1c6a512-1295-4272-9138-f99709370657
2011-11-08 21:36:49 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Daniel Stenberg
*
* 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.
*
****************************************************************************/
#ifndef _BMP_H_
#define _BMP_H_
#include "config.h"
#include "lcd.h"
#include "inttypes.h"
#include "resize.h"
#ifdef HAVE_REMOTE_LCD
#include "lcd-remote.h"
#endif
#define ARRAY_SIZE(array) (int)(sizeof(array)/(sizeof(array[0])))
#define IMG_NORESIZE 0
#define IMG_RESIZE 1
#define BM_MAX_WIDTH (((LCD_WIDTH) + 7) & ~7)
struct uint8_rgb {
uint8_t blue;
uint8_t green;
uint8_t red;
uint8_t alpha;
};
struct dim {
short width;
short height;
};
struct rowset {
short rowstep;
short rowstart;
short rowstop;
};
#if (LCD_DEPTH > 1) || defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH > 1)
extern const unsigned char dither_table[16];
#define DITHERY(y) (dither_table[(y) & 15] & 0xAA)
#define DITHERX(x) (dither_table[(x) & 15])
#define DITHERXDY(x,dy) (DITHERX(x) ^ dy)
#define DITHERDXY(dx,y) (dx ^ DITHERY(y))
#define DITHERXY(x,y) (DITHERX(x) ^ DITHERY(y))
#endif
/* The /256 version has a mean squared variance from YUV luma of <1 grey level.
The /8 version is a good deal less accurate, but sufficient on mono as we
don't support HQ output or dithering there, yet.
*/
static inline unsigned brightness(struct uint8_rgb color)
{
#if LCD_DEPTH > 1 || defined(PLUGIN)
return (77 * (unsigned)color.red + 150 * (unsigned)color.green
+ 29 * (unsigned)color.blue) / 256;
#else
return (2 * (unsigned)color.red + 5 * (unsigned)color.green
+ (unsigned)color.blue) / 8;
#endif
}
#if ((LCD_DEPTH == 2) && (LCD_PIXELFORMAT == VERTICAL_INTERLEAVED)) \
|| (defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_DEPTH == 2) \
&& (LCD_REMOTE_PIXELFORMAT == VERTICAL_INTERLEAVED))
extern const unsigned short vi_pattern[4];
#endif
/* Number of rows of data in a mono bitmap height pixels tall */
#define MONO_BM_HEIGHT(height) (((height) + 7) >> 3)
/* Number of rows of datain a LCD native bitmap height pixels tall */
#if LCD_DEPTH > 1 || (defined(HAVE_REMOTE_LCD) && LCD_REMOTE_DEPTH > 1)
#if LCD_DEPTH == 1 || \
(LCD_DEPTH == 2 && LCD_PIXELFORMAT == VERTICAL_INTERLEAVED)
#define LCD_BM_HEIGHT(height) (((height) + 7) >> 3)
#elif LCD_DEPTH == 2 && LCD_PIXELFORMAT == VERTICAL_PACKING
#define LCD_BM_HEIGHT(height) (((height) + 3) >> 2)
#else
#define LCD_BM_HEIGHT(height) (height)
#endif
/* Number of rows of data in a remote native bitmap height pixels tall. */
#ifdef HAVE_REMOTE_LCD
#if LCD_REMOTE_DEPTH == 1 || \
(LCD_REMOTE_DEPTH == 2 && LCD_REMOTE_PIXELFORMAT == VERTICAL_INTERLEAVED)
#define LCD_REMOTE_BM_HEIGHT(height) (((height) + 7) >> 3)
#elif LCD_REMOTE_DEPTH == 2 && LCD_REMOTE_PIXELFORMAT == VERTICAL_PACKING
#define LCD_REMOTE_BM_HEIGHT(height) (((height) + 3) >> 2)
#else
#define LCD_REMOTE_BM_HEIGHT(height) (height)
#endif
#define NATIVE_BM_HEIGHT(height,remote) ((remote) ? \
LCD_REMOTE_BM_HEIGHT(height) : LCD_BM_HEIGHT(height))
#else
#define NATIVE_BM_HEIGHT(height,remote) LCD_BM_HEIGHT(height)
#endif
/* Convenience macro to calculate rows based on height, remote vs main LCD,
and format
*/
#define BM_HEIGHT(height,format,remote) ((format) == FORMAT_MONO ? \
MONO_BM_HEIGHT(height) : NATIVE_BM_HEIGHT(height,remote))
#else
#define BM_HEIGHT(height,format,remote) MONO_BM_HEIGHT(height)
#endif
/* Number of data elements in a mono bitmap width pixels wide */
#define MONO_BM_WIDTH(width) (width)
/* Number of data elements in a LCD native bitmap width pixels wide */
#if LCD_DEPTH > 1
#if LCD_DEPTH == 2 && LCD_PIXELFORMAT == HORIZONTAL_PACKING
#define LCD_BM_WIDTH(width) (((width) + 3) >> 2)
#else
#define LCD_BM_WIDTH(width) (width)
#endif
/* Number of data elements in a remote native bitmap width pixels wide */
#ifdef HAVE_REMOTE_LCD
#if LCD_REMOTE_DEPTH == 2 && LCD_REMOTE_PIXELFORMAT == HORIZONTAL_PACKING
#define LCD_REMOTE_BM_WIDTH(width) (((width) + 3) >> 2)
#else
#define LCD_REMOTE_BM_WIDTH(width) (width)
#endif
#define NATIVE_BM_WIDTH(width,remote) ((remote) ? \
LCD_REMOTE_BM_WIDTH(width) : LCD_BM_WIDTH(width))
#else
#define NATIVE_BM_WIDTH(width,remote) LCD_BM_WIDTH(width)
#endif
/* Convenience macro to calculate elements based on height, remote vs native
main LCD, and format
*/
#define BM_WIDTH(width,format,remote) ((format) == FORMAT_MONO ? \
MONO_BM_WIDTH(width) : NATIVE_BM_WIDTH(width,remote))
#else
#define BM_WIDTH(width,format,remote) MONO_BM_WIDTH(width)
#endif
/* Size in bytes of a mono bitmap of dimensions width*height */
#define MONO_BM_SIZE(width,height) (MONO_BM_WIDTH(width) * \
MONO_BM_HEIGHT(height) * FB_DATA_SZ)
/* Size in bytes of a native bitmap of dimensions width*height */
#if LCD_DEPTH > 1 || (defined(HAVE_REMOTE_LCD) && LCD_REMOTE_DEPTH > 1)
#if defined(HAVE_REMOTE_LCD) && FB_DATA_SZ != FB_RDATA_SZ
#define NATIVE_BM_SIZE(width,height,format,remote) \
(((remote) ? FB_RDATA_SZ : FB_DATA_SZ) * BM_WIDTH(width,format,remote) \
* BM_HEIGHT(height,format,remote))
#else
#define NATIVE_BM_SIZE(width,height,format,remote) \
(FB_DATA_SZ * BM_WIDTH(width,format,remote) * \
BM_HEIGHT(height,format,remote))
#endif
/* Convenience macro to calculate size in bytes based on height, remote vs
main LCD, and format
*/
#define BM_SIZE(width,height,format,remote) (((format) == FORMAT_MONO) ? \
MONO_BM_SIZE(width,height) : NATIVE_BM_SIZE(width,height,format,remote))
#else
#define BM_SIZE(width,height,format,remote) MONO_BM_SIZE(width,height)
#endif
/* Size in bytes needed to load and scale a bitmap with target size up to
width*height, including overhead to allow for buffer alignment.
*/
#ifdef HAVE_LCD_COLOR
#define BM_SCALED_SIZE(width,height,format,remote) \
(BM_SIZE(width,height,format,remote) + \
(remote ? 0 : BM_WIDTH(width,format,remote) * sizeof(uint32_t) * 9 + 3))
#else
#define BM_SCALED_SIZE(width,height,format,remote) \
(BM_SIZE(width,height,format,remote) + \
(width * sizeof(uint32_t) * 3 + 3))
#endif
/*********************************************************************
* read_bmp_file()
*
* Reads a 8bit BMP file and puts the data in a 1-pixel-per-byte
* array.
* Returns < 0 for error, or number of bytes used from the bitmap buffer
*
**********************************************/
int read_bmp_file(const char* filename,
struct bitmap *bm,
int maxsize,
int format,
const struct custom_format *cformat);
int read_bmp_fd(int fd,
struct bitmap *bm,
int maxsize,
int format,
const struct custom_format *cformat);
#if LCD_DEPTH > 1 && (defined(PLUGIN) || defined(HAVE_BMP_SCALING) || defined(HAVE_JPEG))
void output_row_8_native(uint32_t row, void * row_in,
struct scaler_context *ctx);
#endif
#endif
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