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Started to add PCX routines.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5552 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2012-02-25 21:45:01 +00:00
parent eb4001a52f
commit 3265f0cf44
6 changed files with 224 additions and 2 deletions
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12
src/sp65/bitmap.c
View File

@ -85,6 +85,18 @@ void FreeBitmap (Bitmap* B)
int ValidBitmapSize (unsigned Width, unsigned Height)
/* Return true if this is a valid size for a bitmap */
{
/* Calculate the size of the bitmap in pixels */
unsigned long Size = (unsigned long) Width * Height;
/* Check the size */
return (Size > 0 && Size <= BM_MAX_SIZE);
}
Color GetPixelColor (const Bitmap* B, unsigned X, unsigned Y)
/* Get the color for a given pixel. For indexed bitmaps, the palette entry
* is returned.

5
src/sp65/bitmap.h
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@ -41,7 +41,7 @@
/* common */
#include "strbuf.h"
/* sp65 */
/* sp65 */
#include "palette.h"
#include "pixel.h"
@ -105,6 +105,9 @@ Bitmap* NewBitmap (unsigned Width, unsigned Height);
void FreeBitmap (Bitmap* B);
/* Free a dynamically allocated bitmap */
int ValidBitmapSize (unsigned Width, unsigned Height);
/* Return true if this is a valid size for a bitmap */
Color GetPixelColor (const Bitmap* B, unsigned X, unsigned Y);
/* Get the color for a given pixel. For indexed bitmaps, the palette entry
* is returned.

4
src/sp65/main.c
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@ -44,6 +44,7 @@
/* sp65 */
#include "error.h"
#include "pcx.h" /* ### Testing */
@ -133,6 +134,9 @@ int main (int argc, char* argv [])
break;
}
} else {
/* #### Testing */
ReadPCXFile (Arg);
}
/* Next argument */

3
src/sp65/make/gcc.mak
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@ -26,7 +26,8 @@ OBJS = bitmap.o \
error.o \
fileio.o \
main.o \
palette.o
palette.o \
pcx.o
LIBS = $(COMMON)/common.a

140
src/sp65/pcx.c Normal file
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@ -0,0 +1,140 @@
/*****************************************************************************/
/* */
/* pcx.c */
/* */
/* Read PCX files */
/* */
/* */
/* */
/* (C) 2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <errno.h>
#include <stdio.h>
#include <string.h>
/* sp65 */
#include "error.h"
#include "fileio.h"
#include "pcx.h"
/*****************************************************************************/
/* Macros */
/*****************************************************************************/
/* Size of the PCX header and other constants */
#define PCX_HEADER_SIZE 128
#define PCX_MAGIC_ID 0x0A
/* Type of a PCX header */
typedef unsigned char PCXHeader[PCX_HEADER_SIZE];
/* The following macros are used to access the PCX header, which is a 128 byte
* block of raw data.
*/
#define WORD(H, O) ((H)[O] | ((H)[O+1] << 8))
#define PCX_ID(H) ((H)[0])
#define PCX_FILE_VERSION(H) ((H)[1])
#define PCX_COMPRESSION(H) ((H)[2])
#define PCX_BPP(H) ((H)[3])
#define PCX_XMIN(H) WORD(H, 4)
#define PCX_YMIN(H) WORD(H, 6)
#define PCX_XMAX(H) WORD(H, 8)
#define PCX_YMAX(H) WORD(H, 10)
#define PCX_PLANES(H) ((H)[65])
#define PCX_BYTES_PER_LINE(H) WORD(H, 66)
#define PCX_PAL_INFO(H) WORD(H, 68)
#define PCX_WIDTH(H) WORD(H, 70)
#define PCX_HEIGHT(H) WORD(H, 72)
/*****************************************************************************/
/* Code */
/*****************************************************************************/
Bitmap* ReadPCXFile (const char* Name)
/* Read a bitmap from a PCX file */
{
PCXHeader H;
unsigned Version, Compression;
unsigned BPP, Planes, BytesPerLine;
unsigned Width, Height;
Bitmap* B;
/* Open the file */
FILE* F = fopen (Name, "rb");
if (F == 0) {
Error ("Cannot open PCX file `%s': %s", Name, strerror (errno));
}
/* Read the PCX header */
ReadData (F, H, sizeof (H));
/* Check the magic id byte */
if (PCX_ID (H) != PCX_MAGIC_ID) {
Error ("`%s' is not a PCX file", Name);
}
/* Read more data */
Version = PCX_FILE_VERSION (H);
Compression = PCX_COMPRESSION (H);
BPP = PCX_BPP (H);
Planes = PCX_PLANES (H);
BytesPerLine = PCX_BYTES_PER_LINE (H);
Width = PCX_XMAX (H) - PCX_XMIN (H) + 1;
Height = PCX_YMAX (H) - PCX_YMIN (H) + 1;
/* Check the data */
if (Compression != 0 && Compression != 1) {
Error ("Unsupported compression (%d) in PCX file `%s'",
Compression, Name);
}
if (BPP != 1 && BPP != 4 && BPP != 8) {
Error ("Unsupported bit depth (%d) in PCX file `%s'",
BPP, Name);
}
if (!ValidBitmapSize (Width, Height)) {
Error ("PCX file `%s' has an unsupported size (w=%u, h=%d)",
Name, Width, Height);
}
/* Close the file */
fclose (F);
/* Return the bitmap */
return B;
}

62
src/sp65/pcx.h Normal file
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@ -0,0 +1,62 @@
/*****************************************************************************/
/* */
/* pcx.h */
/* */
/* Read PCX files */
/* */
/* */
/* */
/* (C) 2012, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef PCX_H
#define PCX_H
/* sp65 */
#include "bitmap.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
Bitmap* ReadPCXFile (const char* Name);
/* Read a bitmap from a PCX file */
/* End of pcx.h */
#endif