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Anonymous committed 4d61d42

- #122, initial TGA support (read only)

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  • Parent commits ac9e726
  • Branches GD-2.0

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Files changed (4)

File src/CMakeLists.txt

 	gd_jpeg.c
 	gd_png.c
 	gd_tiff.c
+	gd_tga.c
 	gd_ss.c
 	gd_topal.c
 	gd_wbmp.c
 /*#define IO_DBG(s) (s) */
 #define IO_DBG(s)
 
+#define GD_IO_EOF_CHK(r) \
+	if (r == EOF) { \
+		return 0; \
+	}
 
 /*
  * Write out a word to the I/O context pointer
   return 1;
 }
 
-
 int
 gdGetInt (int *result, gdIOCtx * ctx)
 {

File src/gd_tga.c

+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "gd_tga.h"
+#include "gd.h"
+#include "gdhelpers.h"
+
+/*!	\brief Creates a gdImage from a TGA file
+ *	Creates a gdImage from a TGA binary file via a gdIOCtx.
+ *	\param infile Pointer to TGA binary file
+ *	\return gdImagePtr	
+ */
+BGD_DECLARE(gdImagePtr) gdImageCreateFromTga(FILE * fp)
+{
+	gdImagePtr image;
+	gdIOCtx* in = gdNewFileCtx(fp);
+	image = gdImageCreateFromTgaCtx(in);
+	in->gd_free( in );
+	return image;
+}
+
+BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaPtr(int size, void *data)
+{
+	gdImagePtr im;
+	gdIOCtx *in = gdNewDynamicCtxEx (size, data, 0);
+	im = gdImageCreateFromTgaCtx(in);
+	in->gd_free(in);
+	return im;
+}
+
+
+/*!	\brief Creates a gdImage from a gdIOCtx
+ *	Creates a gdImage from a gdIOCtx referencing a TGA binary file.
+ *	\param ctx Pointer to a gdIOCtx structure
+ *	\return gdImagePtr	
+ */
+BGD_DECLARE(gdImagePtr) gdImageCreateFromTgaCtx(gdIOCtx* ctx)
+{
+
+	int bitmap_caret = 0;
+	int i = 0;
+	oTga *tga = NULL;
+	int pixel_block_size = 0;
+	int image_block_size = 0;
+	volatile gdImagePtr image = NULL;
+	int x = 0;
+	int y = 0;
+	int color = 0;
+
+	tga = (oTga *) gdMalloc(sizeof(oTga));
+	if (!tga) {
+		return NULL;
+	}
+
+	tga->bitmap = NULL;
+	tga->ident = NULL;
+
+	if (!read_header_tga(ctx, tga)) {
+		free_tga(tga);
+		return NULL;    
+	}
+
+	pixel_block_size = tga->bits / 8;
+	image_block_size = (tga->width * tga->height) * pixel_block_size;
+
+	if (read_image_tga(ctx, tga)) {
+		free_tga(tga);
+		return NULL;
+	}
+
+	image = gdImageCreateTrueColor((int)tga->width, (int)tga->height );
+
+	if (image == 0) {
+		free_tga( tga );
+		return NULL;
+	}
+
+	/*!	\brief Populate GD image object
+	 *  Copy the pixel data from our tga bitmap buffer into the GD image
+	 */
+
+	for (y = 0; y < tga->height; y++) {
+		register int *tpix = image->tpixels[y];
+		for ( x = 0; x < tga->width; x++, tpix++) {
+			if (tga->bits == TGA_BPP_24) {
+				*tpix = gdTrueColor(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret]);
+				bitmap_caret += 3;
+			}
+
+			if (tga->bits == TGA_BPP_32) {
+				*tpix = gdTrueColorAlpha(tga->bitmap[bitmap_caret + 2], tga->bitmap[bitmap_caret + 1], tga->bitmap[bitmap_caret], tga->bitmap[bitmap_caret + 3]);
+				bitmap_caret += 4; 
+			}
+
+		}
+	}
+
+	free_tga(tga);
+
+	// Return pointer to our new image object
+	return image;
+}
+
+/*!	\brief Reads a TGA header.
+ *	Reads the header block from a binary TGA file populating the referenced TGA structure.
+ *	\param ctx Pointer to TGA binary file
+ *	\param tga Pointer to TGA structure
+ *	\return int 1 on sucess, -1 on failure	
+ */
+int read_header_tga(gdIOCtx *ctx, oTga *tga) {
+
+	unsigned char header[18];
+
+	if (gdGetBuf(header, 18, ctx) < 18) {
+		printf("fail to read header");
+		return -1;	
+	}
+
+	tga->identsize = header[0];
+	tga->colourmaptype = header[1];
+	tga->imagetype = header[2];
+	tga->colourmapstart = header[3] + header[4] * 256;
+	tga->colourmaplength = header[5] + header[6] * 256;
+	tga->colourmapbits = header[7];
+	tga->xstart = header[8] + header[9] * 256;
+	tga->ystart = header[10] + header[11] * 256;
+	tga->width = header[12] + header[13] * 256;
+	tga->height = header[14] + header[15] * 256;
+	tga->bits = header[16];
+
+	if (tga->bits != 8 && tga->bits != 24 && tga->bits != 16 && tga->bits != 32) {
+		return -1;
+	}
+
+	tga->descriptor = header[17];
+
+	tga->ident = (char *) gdMalloc(tga->identsize * sizeof( char ));
+	if (tga->ident == NULL) {
+		return -1;
+	}
+
+	if (tga->identsize > 0) {
+		gdGetBuf( &( tga->ident ), tga->identsize, ctx );
+	}
+
+	return 1;
+}
+
+/*!	\brief Reads a TGA image data into buffer.
+ *	Reads the image data block from a binary TGA file populating the referenced TGA structure.
+ *	\param ctx Pointer to TGA binary file
+ *	\param tga Pointer to TGA structure
+ *	\return int 0 on sucess, -1 on failure	
+ */
+int read_image_tga( gdIOCtx *ctx, oTga *tga ) {
+	int pixel_block_size = (tga->bits / 8);
+	int image_block_size = (tga->width * tga->height) * pixel_block_size;
+	byte* decompression_buffer = NULL;
+	unsigned char* conversion_buffer = NULL;
+	int buffer_caret = 0;
+	int bitmap_caret = 0;
+	int i = 0;
+	int j = 0;
+	byte encoded_pixels;
+
+	/*!	\brief Allocate memmory for image block
+	 *  Allocate a chunk of memory for the image block to be passed into.
+	 */
+	tga->bitmap = (byte *) gdMalloc(image_block_size * sizeof(byte));
+	if (tga->bitmap == NULL) {
+		return -1;
+	}
+
+	/*! \todo Add image type support
+	 *  Add support for this image type.
+	 */
+	if (tga->imagetype == TGA_TYPE_INDEXED) {
+		return -1;
+	}
+
+	/*! \todo Add image type support
+	 *  Add support for this image type.
+	 */
+	if (tga->imagetype == TGA_TYPE_INDEXED_RLE) {
+		return -1;
+	}
+
+	/*! \brief Read in uncompressed RGB TGA
+	 *  Chunk load the pixel data from an uncompressed RGB type TGA.
+	 */
+	if (tga->imagetype == TGA_TYPE_RGB) {
+		conversion_buffer = (unsigned char *) gdMalloc(image_block_size * sizeof(unsigned char));
+		if (conversion_buffer == NULL) {
+			gdFree(conversion_buffer);
+			return -1;
+		}
+
+		gdGetBuf(conversion_buffer, image_block_size, ctx);
+
+		while (buffer_caret < image_block_size) { 
+			tga->bitmap[buffer_caret] = (int) conversion_buffer[buffer_caret];
+			buffer_caret++;
+		}
+
+		gdFree( conversion_buffer );
+	}
+
+	/*! \brief Read in RLE compressed RGB TGA
+	 *  Chunk load the pixel data from an RLE compressed RGB type TGA.
+	 */
+	if (tga->imagetype == TGA_TYPE_RGB_RLE) {
+		decompression_buffer = (byte*) gdMalloc(image_block_size * sizeof(byte));
+		if (decompression_buffer == NULL) {
+			gdFree( decompression_buffer );
+			return -1;
+		}
+		conversion_buffer = (unsigned char *) gdMalloc(image_block_size * sizeof(unsigned char));  
+		if (conversion_buffer == NULL) {
+			gdFree( decompression_buffer );
+			gdFree( conversion_buffer );
+			return -1;
+		}
+
+		gdGetBuf( conversion_buffer, image_block_size, ctx );
+
+		buffer_caret = 0;
+
+		while( buffer_caret < image_block_size ) { 
+			decompression_buffer[buffer_caret] = (int)conversion_buffer[buffer_caret];
+			buffer_caret++;
+		}
+
+		buffer_caret = 0;
+
+		while( bitmap_caret < image_block_size ) {
+
+			if ((decompression_buffer[buffer_caret] & TGA_RLE_FLAG) == TGA_RLE_FLAG) {
+				encoded_pixels = ( ( decompression_buffer[ buffer_caret ] & 127 ) + 1 );
+				buffer_caret++;
+
+				for (i = 0; i < encoded_pixels; i++) {
+					for (j = 0; j < pixel_block_size; j++, bitmap_caret++) {
+						tga->bitmap[ bitmap_caret ] = decompression_buffer[ buffer_caret + j ];
+					}
+				}
+				buffer_caret += pixel_block_size;
+			} else {
+				encoded_pixels = decompression_buffer[ buffer_caret ] + 1;
+				buffer_caret++;
+
+				for (i = 0; i < encoded_pixels; i++) {
+					for( j = 0; j < pixel_block_size; j++, bitmap_caret++ ) {
+						tga->bitmap[ bitmap_caret ] = decompression_buffer[ buffer_caret + j ];
+					}
+					buffer_caret += pixel_block_size;
+				}
+			}
+		}
+
+		gdFree( decompression_buffer );
+		gdFree( conversion_buffer );
+
+	}
+
+	/*!	\todo Add image type support
+	 *  Add support for this image type.
+	 */
+	if( tga->imagetype == TGA_TYPE_GREYSCALE ) {
+		return -1;
+	}
+
+	/*!	\todo Add image type support
+	 *  Add support for this image type.
+	 */
+	if( tga->imagetype == TGA_TYPE_GREYSCALE_RLE ) {
+		return -1;
+	}
+
+	return 0;
+}
+
+/*!	\brief Cleans up a TGA structure.
+ *	Dereferences the bitmap referenced in a TGA structure, then the structure itself
+ *	\param tga Pointer to TGA structure
+ */
+void free_tga(oTga * tga) {
+	if (tga) {
+		if (tga->ident) {
+			gdFree(tga->ident);
+			tga->ident = NULL;
+		}
+		if (tga->bitmap) {
+			gdFree(tga->bitmap);
+			tga->bitmap = NULL;
+		}
+		gdFree(tga);
+		tga = NULL;
+	}
+}

File src/gd_tga.h

+/*
+ * TGA Image read support
+ * Copyright (C) 2005  Andrew Ireland, Jon Keto, Michael Beal
+ * 
+ * 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 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ */
+
+#define TGA_LINE_LENGTH 1024
+
+#ifndef __TGA_H
+#define __TGA_H	1
+
+
+#include "gd.h"
+#include "gdhelpers.h"
+
+
+#ifndef O_BYTE
+#define O_BYTE    1
+    typedef int byte;
+#endif
+#ifndef O_SHORT_INT
+#define O_SHORT_INT     1
+    typedef int short_int;
+#endif
+
+typedef struct oTga_
+{
+    byte  identsize;			// size of ID field that follows 18 byte header (0 usually)
+    byte  colourmaptype;		// type of colour map 0=none, 1=has palette					[IGNORED] Adrian requested no support
+    byte  imagetype;			// type of image 0=none,1=indexed,2=rgb,3=grey,+8=rle packed
+
+    int colourmapstart;		        // first colour map entry in palette						[IGNORED] Adrian requested no support
+    int colourmaplength;		// number of colours in palette								[IGNORED] Adrian requested no support
+    byte  colourmapbits;		// number of bits per palette entry 15,16,24,32				[IGNORED] Adrian requested no support
+
+    int xstart;				// image x origin
+    int ystart;				// image y origin
+    int width;				// image width in pixels
+    int height;				// image height in pixels
+    byte  bits;				// image bits per pixel 8,16,24,32
+    byte  descriptor;			// image descriptor bits (vh flip bits)
+    
+    char *ident;			// identifcation tag string
+    int *bitmap;			// bitmap data
+    
+} oTga;
+
+
+
+#define TGA_TYPE_NO_IMAGE                       0
+#define TGA_TYPE_INDEXED                        1
+#define TGA_TYPE_RGB                            2
+#define TGA_TYPE_GREYSCALE                      3
+#define TGA_TYPE_INDEXED_RLE                    9
+#define TGA_TYPE_RGB_RLE                        10
+#define TGA_TYPE_GREYSCALE_RLE                  11
+#define TGA_TYPE_INDEXED_HUFFMAN_DELTA_RLE      32 
+#define TGA_TYPE_RGB_HUFFMAN_DELTA_QUADTREE_RLE 33
+
+#define TGA_BPP_8  8
+#define TGA_BPP_16 16
+#define TGA_BPP_24 24
+#define TGA_BPP_32 32
+
+#define TGA_RLE_FLAG 128
+
+gdImagePtr gdImageCreateFromTGA( FILE * fp );
+gdImagePtr gdImageCreateFromTGACtx( gdIOCtx* ctx );
+
+int read_header_tga(gdIOCtx *ctx, oTga *tga);
+int read_image_tga(gdIOCtx *ctx, oTga *tga);
+void free_tga(oTga * tga);
+
+#endif //__TGA_H