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- /* $Id: image.c,v 1.9 1997/02/09 20:05:03 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 2.2
- * Copyright (C) 1995-1997 Brian Paul
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- /*
- * $Log: image.c,v $
- * Revision 1.9 1997/02/09 20:05:03 brianp
- * new arguments for gl_pixel_addr_in_image()
- *
- * Revision 1.8 1997/02/09 18:52:53 brianp
- * added GL_EXT_texture3D support
- *
- * Revision 1.7 1997/01/09 21:25:54 brianp
- * initialize image reference count to zero
- *
- * Revision 1.6 1996/11/13 03:58:31 brianp
- * fixed undefined "format" variable in gl_unpack_image()
- *
- * Revision 1.5 1996/11/10 17:48:03 brianp
- * check if format is GL_DEPTH_COMPONENT or GL_STENCIL_COMPONENT
- *
- * Revision 1.4 1996/11/06 04:23:01 brianp
- * changed gl_unpack_image() components argument to srcFormat
- *
- * Revision 1.3 1996/09/27 01:27:10 brianp
- * removed unused variables
- *
- * Revision 1.2 1996/09/26 22:35:10 brianp
- * fixed a few compiler warnings from IRIX 6 -n32 and -64 compiler
- *
- * Revision 1.1 1996/09/13 01:38:16 brianp
- * Initial revision
- *
- */
-
-
- #include <assert.h>
- #include <stdlib.h>
- #include <string.h>
- #include "image.h"
- #include "macros.h"
- #include "pixel.h"
- #include "types.h"
-
-
-
-
- /*
- * Flip the 8 bits in each byte of the given array.
- */
- void gl_flip_bytes( GLubyte *p, GLuint n )
- {
- register GLuint i, a, b;
-
- for (i=0;i<n;i++) {
- b = (GLuint) p[i];
- a = ((b & 0x01) << 7) |
- ((b & 0x02) << 5) |
- ((b & 0x04) << 3) |
- ((b & 0x08) << 1) |
- ((b & 0x10) >> 1) |
- ((b & 0x20) >> 3) |
- ((b & 0x40) >> 5) |
- ((b & 0x80) >> 7);
- p[i] = (GLubyte) a;
- }
- }
-
-
- /*
- * Flip the order of the 2 bytes in each word in the given array.
- */
- void gl_swap2( GLushort *p, GLuint n )
- {
- register GLuint i;
-
- for (i=0;i<n;i++) {
- p[i] = (p[i] >> 8) | ((p[i] << 8) & 0xff00);
- }
- }
-
-
-
- /*
- * Flip the order of the 4 bytes in each word in the given array.
- */
- void gl_swap4( GLuint *p, GLuint n )
- {
- register GLuint i, a, b;
-
- for (i=0;i<n;i++) {
- b = p[i];
- a = (b >> 24)
- | ((b >> 8) & 0xff00)
- | ((b << 8) & 0xff0000)
- | ((b << 24) & 0xff000000);
- p[i] = a;
- }
- }
-
-
-
-
- /*
- * Return the size, in bytes, of the given GL datatype.
- * Return 0 if GL_BITMAP.
- * Return -1 if invalid type enum.
- */
- GLint gl_sizeof_type( GLenum type )
- {
- switch (type) {
- case GL_BITMAP:
- return 0;
- case GL_UNSIGNED_BYTE:
- return sizeof(GLubyte);
- case GL_BYTE:
- return sizeof(GLbyte);
- case GL_UNSIGNED_SHORT:
- return sizeof(GLushort);
- case GL_SHORT:
- return sizeof(GLshort);
- case GL_UNSIGNED_INT:
- return sizeof(GLuint);
- case GL_INT:
- return sizeof(GLint);
- case GL_FLOAT:
- return sizeof(GLfloat);
- default:
- return -1;
- }
- }
-
-
-
- /*
- * Return the number of components in a GL enum pixel type.
- * Return -1 if bad format.
- */
- GLint gl_components_in_format( GLenum format )
- {
- switch (format) {
- case GL_COLOR_INDEX:
- case GL_STENCIL_INDEX:
- case GL_DEPTH_COMPONENT:
- case GL_RED:
- case GL_GREEN:
- case GL_BLUE:
- case GL_ALPHA:
- case GL_LUMINANCE:
- return 1;
- case GL_LUMINANCE_ALPHA:
- return 2;
- case GL_RGB:
- return 3;
- case GL_RGBA:
- return 4;
- default:
- return -1;
- }
- }
-
-
- /*
- * Return the address of a pixel in an image (actually a volume).
- * Pixel unpacking/packing parameters are observed according to 'packing'.
- * Input: image - start of image data
- * width, height - size of image
- * format - image format
- * type - pixel component type
- * packing - GL_TRUE = use packing params
- * GL_FALSE = use unpacking params.
- * img - which image in the volume (0 for 2-D images)
- * row, column - location of pixel in the image
- * Return: address of pixel at (image,row,column) in image or NULL if error.
- */
- GLvoid *gl_pixel_addr_in_image( struct gl_pixelstore_attrib *packing,
- const GLvoid *image, GLsizei width,
- GLsizei height, GLenum format, GLenum type,
- GLint img, GLint row, GLint column )
- {
- GLint bytes_per_comp; /* bytes per component */
- GLint comp_per_pixel; /* components per pixel */
- GLint comps_per_row; /* components per row */
- GLint pixels_per_row; /* pixels per row */
- GLint bytes_per_image;
- GLint rows_per_image;
- GLint alignment; /* 1, 2 or 4 */
- GLint skiprows;
- GLint skippixels;
- GLint skipimages; /* for 3-D */
- GLubyte *pixel_addr;
-
- /* Compute bytes per component */
- bytes_per_comp = gl_sizeof_type( type );
- if (bytes_per_comp<0) {
- return NULL;
- }
-
- /* Compute number of components per pixel */
- comp_per_pixel = gl_components_in_format( format );
- if (comp_per_pixel<0) {
- return NULL;
- }
-
- alignment = packing->Alignment;
- if (packing->RowLength>0) {
- pixels_per_row = packing->RowLength;
- }
- else {
- pixels_per_row = width;
- }
- if (packing->ImageHeight>0) {
- rows_per_image = packing->ImageHeight;
- }
- else {
- rows_per_image = height;
- }
- skiprows = packing->SkipRows;
- skippixels = packing->SkipPixels;
- skipimages = packing->SkipImages;
-
- if (type==GL_BITMAP) {
- /* BITMAP data */
- GLint bytes_per_row;
-
- bytes_per_row = alignment
- * CEILING( comp_per_pixel*pixels_per_row, 8*alignment );
-
- bytes_per_image = bytes_per_row * rows_per_image;
-
- pixel_addr = (GLubyte *) image
- + (skipimages + img) * bytes_per_image
- + (skiprows + row) * bytes_per_row
- + (skippixels + column) / 8;
- }
- else {
- /* Non-BITMAP data */
-
- if (bytes_per_comp>=alignment) {
- comps_per_row = comp_per_pixel * pixels_per_row;
- }
- else {
- GLint bytes_per_row = bytes_per_comp * comp_per_pixel
- * pixels_per_row;
-
- comps_per_row = alignment / bytes_per_comp
- * CEILING( bytes_per_row, alignment );
- }
-
- bytes_per_image = bytes_per_comp * comps_per_row * rows_per_image;
-
- /* Copy/unpack pixel data to buffer */
- pixel_addr = (GLubyte *) image
- + (skipimages + img) * bytes_per_image
- + (skiprows + row) * bytes_per_comp * comps_per_row
- + (skippixels + column) * bytes_per_comp * comp_per_pixel;
- }
-
- return (GLvoid *) pixel_addr;
- }
-
-
-
- /*
- * Unpack a 2-D image from user-supplied address, returning a pointer to
- * a new gl_image struct.
- * This function is always called by a higher-level unpack function such
- * as gl_unpack_texsubimage() or gl_unpack_bitmap().
- *
- * Input: width, height - size in pixels
- * srcFormat - format of incoming pixel data, ignored
- * if srcType and destType is BITMAP.
- * srcType - GL_UNSIGNED_BYTE .. GL_FLOAT
- * destType - store image as GL_UNSIGNED_BYTE, GL_FLOAT, or GL_BITMAP.
- * if GL_UNSIGNED_BYTE, srctype must be GL_UNSIGNED_BYTE.
- * if GL_BITMAP, srctype must be GL_BITMAP.
- * interleave - if TRUE, srctype and destType must be GL_UNSIGNED_BYTE
- * pixels - pointer to unpacked image.
- */
- struct gl_image *gl_unpack_image( GLcontext *ctx,
- GLint width, GLint height,
- GLenum srcFormat, GLenum srcType,
- GLenum destType,
- const GLvoid *pixels,
- GLboolean interleave )
- {
- return gl_unpack_image3D(ctx, width, height, 1,
- srcFormat, srcType, destType, pixels, interleave);
- }
-
-
-
- /*
- * Unpack a 2-D/3-D image from user-supplied address, returning a pointer to
- * a new gl_image struct.
- * This function is always called by a higher-level unpack function such
- * as gl_unpack_texsubimage() or gl_unpack_bitmap().
- *
- * Input: width, height, depth - size in pixels
- * srcFormat - format of incoming pixel data, ignored
- * if srcType and destType is BITMAP.
- * srcType - GL_UNSIGNED_BYTE .. GL_FLOAT
- * destType - store image as GL_UNSIGNED_BYTE, GL_FLOAT, or GL_BITMAP.
- * if GL_UNSIGNED_BYTE, srctype must be GL_UNSIGNED_BYTE.
- * if GL_BITMAP, srctype must be GL_BITMAP.
- * interleave - if TRUE, srctype and destType must be GL_UNSIGNED_BYTE
- * pixels - pointer to unpacked image.
- */
- struct gl_image *gl_unpack_image3D( GLcontext *ctx,
- GLint width, GLint height, GLint depth,
- GLenum srcFormat, GLenum srcType,
- GLenum destType,
- const GLvoid *pixels,
- GLboolean interleave )
- {
- GLint components;
-
- components = gl_components_in_format( srcFormat );
-
- if (srcType==GL_BITMAP || destType==GL_BITMAP) {
- struct gl_image *image;
- GLint bytes, i, width_in_bytes, d;
- GLubyte *buffer, *dst;
- assert( srcType==GL_BITMAP );
- assert( destType==GL_BITMAP );
-
- /* Alloc dest storage */
- bytes = ((width+7)/8 * height) * depth;
- if (bytes>0 && pixels!=NULL) {
- buffer = (GLubyte *) malloc( bytes );
- if (!buffer) {
- return NULL;
- }
- /* Copy/unpack pixel data to buffer */
- width_in_bytes = CEILING( width, 8 );
- dst = buffer;
- for (d=0; d<depth; d++) {
- for (i=0; i<height; i++) {
- GLvoid *src = gl_pixel_addr_in_image( &ctx->Unpack, pixels,
- width, height,
- GL_COLOR_INDEX, srcType,
- d, i, 0 );
- if (!src) {
- free(buffer);
- return NULL;
- }
- MEMCPY( dst, src, width_in_bytes );
- dst += width_in_bytes;
- }
- }
- /* Bit flipping */
- if (ctx->Unpack.LsbFirst) {
- gl_flip_bytes( buffer, bytes );
- }
- }
- else {
- /* a 'null' bitmap */
- buffer = NULL;
- }
-
- image = (struct gl_image *) malloc( sizeof(struct gl_image) );
- if (image) {
- image->Width = width;
- image->Height = height;
- image->Depth = depth;
- image->Components = 0;
- image->Format = GL_COLOR_INDEX;
- image->Type = GL_BITMAP;
- image->Interleaved = GL_FALSE;
- image->Data = buffer;
- image->RefCount = 0;
- }
- else {
- free( buffer );
- return NULL;
- }
- return image;
- }
- else if (srcFormat==GL_DEPTH_COMPONENT) {
- /* TODO: pack as GLdepth values (GLushort or GLuint) */
-
- }
- else if (srcFormat==GL_STENCIL_INDEX) {
- /* TODO: pack as GLstencil (GLubyte or GLushort) */
-
- }
- else if (destType==GL_UNSIGNED_BYTE) {
- struct gl_image *image;
- GLint width_in_bytes;
- GLubyte *buffer, *dst;
- GLint i, d;
- assert( srcType==GL_UNSIGNED_BYTE );
-
- width_in_bytes = width * components * sizeof(GLubyte);
- buffer = malloc( height * width_in_bytes * depth );
- if (!buffer) {
- return NULL;
- }
- /* Copy/unpack pixel data to buffer */
- dst = buffer;
- for (d=0; d<depth; d++ ) {
- for (i=0;i<height;i++) {
- GLubyte *src = (GLubyte *) gl_pixel_addr_in_image( &ctx->Unpack,
- pixels, width, height, srcFormat, srcType, d, i, 0 );
- if (!src) {
- free(buffer);
- return NULL;
- }
- if (interleave) {
- GLint j, k;
- for (j=0;j<width;j++) {
- for (k=0;k<components;k++) {
- dst[k*width+j] = src[j*components+k];
- }
- }
- }
- else {
- MEMCPY( dst, src, width_in_bytes );
- }
- dst += width_in_bytes;
- }
- }
-
- if (ctx->Unpack.LsbFirst) {
- gl_flip_bytes( buffer, height * width_in_bytes * depth );
- }
-
- image = (struct gl_image *) malloc( sizeof(struct gl_image) );
- if (image) {
- image->Width = width;
- image->Height = height;
- image->Depth = depth;
- image->Components = components;
- image->Format = srcFormat;
- image->Type = GL_UNSIGNED_BYTE;
- image->Interleaved = interleave;
- image->Data = buffer;
- }
- else {
- free( buffer );
- return NULL;
- }
- return image;
- }
- else if (destType==GL_FLOAT) {
- struct gl_image *image;
- GLfloat *buffer, *dst;
- GLint elems_per_row;
- GLint i, j, d;
- elems_per_row = width * components;
- buffer = (GLfloat *) malloc( height * elems_per_row * sizeof(GLfloat) * depth);
- if (!buffer) {
- return NULL;
- }
-
- dst = buffer;
- /** img_pixels= pixels;*/
- for (d=0; d<depth; d++) {
- for (i=0;i<height;i++) {
- GLvoid *src = gl_pixel_addr_in_image( &ctx->Unpack, pixels,
- width, height,
- srcFormat, srcType,
- d, i, 0 );
- if (!src) {
- free(buffer);
- return NULL;
- }
-
- switch (srcType) {
- case GL_UNSIGNED_BYTE:
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLubyte*)src)[j];
- }
- break;
- case GL_BYTE:
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLbyte*)src)[j];
- }
- break;
- case GL_UNSIGNED_SHORT:
- if (ctx->Unpack.SwapBytes) {
- for (j=0;j<elems_per_row;j++) {
- GLushort value = ((GLushort*)src)[j];
- value = ((value >> 8) & 0xff) | ((value&0xff) << 8);
- *dst++ = (GLfloat) value;
- }
- }
- else {
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLushort*)src)[j];
- }
- }
- break;
- case GL_SHORT:
- if (ctx->Unpack.SwapBytes) {
- for (j=0;j<elems_per_row;j++) {
- GLshort value = ((GLshort*)src)[j];
- value = ((value >> 8) & 0xff) | ((value&0xff) << 8);
- *dst++ = (GLfloat) value;
- }
- }
- else {
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLshort*)src)[j];
- }
- }
- break;
- case GL_UNSIGNED_INT:
- if (ctx->Unpack.SwapBytes) {
- GLuint value;
- for (j=0;j<elems_per_row;j++) {
- value = ((GLuint*)src)[j];
- value = ((value & 0xff000000) >> 24)
- | ((value & 0x00ff0000) >> 8)
- | ((value & 0x0000ff00) << 8)
- | ((value & 0x000000ff) << 24);
- *dst++ = (GLfloat) value;
- }
- }
- else {
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLuint*)src)[j];
- }
- }
- break;
- case GL_INT:
- if (ctx->Unpack.SwapBytes) {
- GLint value;
- for (j=0;j<elems_per_row;j++) {
- value = ((GLint*)src)[j];
- value = ((value & 0xff000000) >> 24)
- | ((value & 0x00ff0000) >> 8)
- | ((value & 0x0000ff00) << 8)
- | ((value & 0x000000ff) << 24);
- *dst++ = (GLfloat) value;
- }
- }
- else {
- for (j=0;j<elems_per_row;j++) {
- *dst++ = (GLfloat) ((GLint*)src)[j];
- }
- }
- break;
- case GL_FLOAT:
- if (ctx->Unpack.SwapBytes) {
- GLint value;
- for (j=0;j<elems_per_row;j++) {
- value = ((GLuint*)src)[j];
- value = ((value & 0xff000000) >> 24)
- | ((value & 0x00ff0000) >> 8)
- | ((value & 0x0000ff00) << 8)
- | ((value & 0x000000ff) << 24);
- *dst++ = *((GLfloat*) &value);
- }
- }
- else {
- MEMCPY( dst, src, elems_per_row*sizeof(GLfloat) );
- dst += elems_per_row;
- }
- break;
- default:
- abort();
- } /*switch*/
- } /* for height */
- } /*for*/
-
- image = (struct gl_image *) malloc( sizeof(struct gl_image) );
- if (image) {
- image->Width = width;
- image->Height = height;
- image->Depth = depth;
- image->Components = components;
- image->Format = srcFormat;
- image->Type = GL_FLOAT;
- image->Interleaved = GL_FALSE;
- image->Data = buffer;
- }
- else {
- free( buffer );
- return NULL;
- }
- return image;
- }
- else {
- abort();
- }
- return NULL; /* never get here */
- }
-
-
-
- void gl_free_image( struct gl_image *image )
- {
- if (image->Data) {
- free(image->Data);
- }
- free(image);
- }
-