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+/* $XFree86: xc/lib/GL/glx/pixel.c,v 1.8 2003/09/28 20:15:04 alanh Exp $ */
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+*/
+
+#include "packrender.h"
+
+static const GLubyte MsbToLsbTable[256] = {
+ 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
+ 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
+ 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
+ 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
+ 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
+ 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
+ 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
+ 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
+ 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
+ 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
+ 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
+ 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
+ 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
+ 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
+ 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
+ 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
+ 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
+ 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
+ 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
+ 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
+ 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
+ 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
+ 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
+ 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
+ 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
+ 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
+ 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
+ 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
+ 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
+ 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
+ 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
+ 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
+};
+
+static const GLubyte LowBitsMask[9] = {
+ 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
+};
+
+static const GLubyte HighBitsMask[9] = {
+ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff,
+};
+
+
+/*
+** Copy bitmap data from clients packed memory applying unpacking modes as the
+** data is transfered into the destImage buffer. Return in modes the
+** set of pixel modes that are to be done by the server.
+*/
+static void FillBitmap(__GLXcontext *gc, GLint width, GLint height,
+ GLenum format, const GLvoid *userdata,
+ GLubyte *destImage)
+{
+ const __GLXattribute * state = gc->client_state_private;
+ GLint rowLength = state->storeUnpack.rowLength;
+ GLint alignment = state->storeUnpack.alignment;
+ GLint skipPixels = state->storeUnpack.skipPixels;
+ GLint skipRows = state->storeUnpack.skipRows;
+ GLint lsbFirst = state->storeUnpack.lsbFirst;
+ GLint elementsLeft, bitOffset, currentByte, nextByte, highBitMask;
+ GLint lowBitMask, i;
+ GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
+ const GLubyte *start, *iter;
+
+ if (rowLength > 0) {
+ groupsPerRow = rowLength;
+ } else {
+ groupsPerRow = width;
+ }
+ components = __glElementsPerGroup(format,GL_BITMAP);
+ rowSize = (groupsPerRow * components + 7) >> 3;
+ padding = (rowSize % alignment);
+ if (padding) {
+ rowSize += alignment - padding;
+ }
+ start = ((const GLubyte*) userdata) + skipRows * rowSize +
+ ((skipPixels * components) >> 3);
+ bitOffset = (skipPixels * components) & 7;
+ highBitMask = LowBitsMask[8-bitOffset];
+ lowBitMask = HighBitsMask[bitOffset];
+ elementsPerRow = width * components;
+ for (i = 0; i < height; i++) {
+ elementsLeft = elementsPerRow;
+ iter = start;
+ while (elementsLeft) {
+ /* First retrieve low bits from current byte */
+ if (lsbFirst) {
+ currentByte = MsbToLsbTable[iter[0]];
+ } else {
+ currentByte = iter[0];
+ }
+ if (bitOffset) {
+ /* Need to read next byte to finish current byte */
+ if (elementsLeft > (8 - bitOffset)) {
+ if (lsbFirst) {
+ nextByte = MsbToLsbTable[iter[1]];
+ } else {
+ nextByte = iter[1];
+ }
+ currentByte =
+ ((currentByte & highBitMask) << bitOffset) |
+ ((nextByte & lowBitMask) >> (8 - bitOffset));
+ } else {
+ currentByte =
+ ((currentByte & highBitMask) << bitOffset);
+ }
+ }
+ if (elementsLeft >= 8) {
+ *destImage = currentByte;
+ elementsLeft -= 8;
+ } else {
+ *destImage = currentByte & HighBitsMask[elementsLeft];
+ elementsLeft = 0;
+ }
+ destImage++;
+ iter++;
+ }
+ start += rowSize;
+ }
+}
+
+/*
+** Extract array from user's data applying all pixel store modes.
+** The internal packed array format used has LSB_FIRST = FALSE and
+** ALIGNMENT = 1.
+*/
+void __glFillImage(__GLXcontext *gc, GLint dim, GLint width, GLint height,
+ GLint depth, GLenum format, GLenum type,
+ const GLvoid *userdata, GLubyte *newimage, GLubyte *modes)
+{
+ const __GLXattribute * state = gc->client_state_private;
+ GLint rowLength = state->storeUnpack.rowLength;
+ GLint imageHeight = state->storeUnpack.imageHeight;
+ GLint alignment = state->storeUnpack.alignment;
+ GLint skipPixels = state->storeUnpack.skipPixels;
+ GLint skipRows = state->storeUnpack.skipRows;
+ GLint skipImages = state->storeUnpack.skipImages;
+ GLint swapBytes = state->storeUnpack.swapEndian;
+ GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
+ GLint elementsPerRow, imageSize, rowsPerImage, h, i, j, k;
+ const GLubyte *start, *iter, *itera, *iterb, *iterc;
+ GLubyte *iter2;
+
+ if (type == GL_BITMAP) {
+ FillBitmap(gc, width, height, format, userdata, newimage);
+ } else {
+ components = __glElementsPerGroup(format,type);
+ if (rowLength > 0) {
+ groupsPerRow = rowLength;
+ } else {
+ groupsPerRow = width;
+ }
+ if (imageHeight > 0) {
+ rowsPerImage = imageHeight;
+ } else {
+ rowsPerImage = height;
+ }
+
+ elementSize = __glBytesPerElement(type);
+ groupSize = elementSize * components;
+ if (elementSize == 1) swapBytes = 0;
+
+ rowSize = groupsPerRow * groupSize;
+ padding = (rowSize % alignment);
+ if (padding) {
+ rowSize += alignment - padding;
+ }
+ imageSize = rowSize * rowsPerImage;
+ start = ((const GLubyte*) userdata) + skipImages * imageSize +
+ skipRows * rowSize + skipPixels * groupSize;
+ iter2 = newimage;
+ elementsPerRow = width * components;
+
+ if (swapBytes) {
+ itera = start;
+ for (h = 0; h < depth; h++) {
+ iterb = itera;
+ for (i = 0; i < height; i++) {
+ iterc = iterb;
+ for (j = 0; j < elementsPerRow; j++) {
+ for (k = 1; k <= elementSize; k++) {
+ iter2[k-1] = iterc[elementSize - k];
+ }
+ iter2 += elementSize;
+ iterc += elementSize;
+ }
+ iterb += rowSize;
+ }
+ itera += imageSize;
+ }
+ } else {
+ itera = start;
+ for (h = 0; h < depth; h++) {
+ if (rowSize == elementsPerRow * elementSize) {
+ /* Ha! This is mondo easy! */
+ __GLX_MEM_COPY(iter2, itera,
+ elementsPerRow * elementSize * height);
+ iter2 += elementsPerRow * elementSize * height;
+ } else {
+ iter = itera;
+ for (i = 0; i < height; i++) {
+ __GLX_MEM_COPY(iter2, iter, elementsPerRow*elementSize);
+ iter2 += elementsPerRow * elementSize;
+ iter += rowSize;
+ }
+ }
+ itera += imageSize;
+ }
+ }
+ }
+
+ /* Setup store modes that describe what we just did */
+ if (modes) {
+ if ( dim < 3 ) {
+ (void) memcpy( modes, __glXDefaultPixelStore + 4, 20 );
+ }
+ else {
+ (void) memcpy( modes, __glXDefaultPixelStore + 0, 36 );
+ }
+ }
+}
+
+/*
+** Empty a bitmap in LSB_FIRST=GL_FALSE and ALIGNMENT=4 format packing it
+** into the clients memory using the pixel store PACK modes.
+*/
+static void EmptyBitmap(__GLXcontext *gc, GLint width, GLint height,
+ GLenum format, const GLubyte *sourceImage,
+ GLvoid *userdata)
+{
+ const __GLXattribute * state = gc->client_state_private;
+ GLint rowLength = state->storePack.rowLength;
+ GLint alignment = state->storePack.alignment;
+ GLint skipPixels = state->storePack.skipPixels;
+ GLint skipRows = state->storePack.skipRows;
+ GLint lsbFirst = state->storePack.lsbFirst;
+ GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
+ GLint sourceRowSize, sourcePadding, sourceSkip;
+ GLubyte *start, *iter;
+ GLint elementsLeft, bitOffset, currentByte, highBitMask, lowBitMask;
+ GLint writeMask, i;
+ GLubyte writeByte;
+
+ components = __glElementsPerGroup(format,GL_BITMAP);
+ if (rowLength > 0) {
+ groupsPerRow = rowLength;
+ } else {
+ groupsPerRow = width;
+ }
+
+ rowSize = (groupsPerRow * components + 7) >> 3;
+ padding = (rowSize % alignment);
+ if (padding) {
+ rowSize += alignment - padding;
+ }
+ sourceRowSize = (width * components + 7) >> 3;
+ sourcePadding = (sourceRowSize % 4);
+ if (sourcePadding) {
+ sourceSkip = 4 - sourcePadding;
+ } else {
+ sourceSkip = 0;
+ }
+ start = ((GLubyte*) userdata) + skipRows * rowSize +
+ ((skipPixels * components) >> 3);
+ bitOffset = (skipPixels * components) & 7;
+ highBitMask = LowBitsMask[8-bitOffset];
+ lowBitMask = HighBitsMask[bitOffset];
+ elementsPerRow = width * components;
+ for (i = 0; i < height; i++) {
+ elementsLeft = elementsPerRow;
+ iter = start;
+ writeMask = highBitMask;
+ writeByte = 0;
+ while (elementsLeft) {
+ /* Set up writeMask (to write to current byte) */
+ if (elementsLeft + bitOffset < 8) {
+ /* Need to trim writeMask */
+ writeMask &= HighBitsMask[bitOffset+elementsLeft];
+ }
+
+ if (lsbFirst) {
+ currentByte = MsbToLsbTable[iter[0]];
+ } else {
+ currentByte = iter[0];
+ }
+
+ if (bitOffset) {
+ writeByte |= (sourceImage[0] >> bitOffset);
+ currentByte = (currentByte & ~writeMask) |
+ (writeByte & writeMask);
+ writeByte = (sourceImage[0] << (8 - bitOffset));
+ } else {
+ currentByte = (currentByte & ~writeMask) |
+ (sourceImage[0] & writeMask);
+ }
+
+ if (lsbFirst) {
+ iter[0] = MsbToLsbTable[currentByte];
+ } else {
+ iter[0] = currentByte;
+ }
+
+ if (elementsLeft >= 8) {
+ elementsLeft -= 8;
+ } else {
+ elementsLeft = 0;
+ }
+ sourceImage++;
+ iter++;
+ writeMask = 0xff;
+ }
+ if (writeByte) {
+ /* Some data left over that still needs writing */
+ writeMask &= lowBitMask;
+ if (lsbFirst) {
+ currentByte = MsbToLsbTable[iter[0]];
+ } else {
+ currentByte = iter[0];
+ }
+ currentByte = (currentByte & ~writeMask) | (writeByte & writeMask);
+ if (lsbFirst) {
+ iter[0] = MsbToLsbTable[currentByte];
+ } else {
+ iter[0] = currentByte;
+ }
+ }
+ start += rowSize;
+ sourceImage += sourceSkip;
+ }
+}
+
+/*
+** Insert array into user's data applying all pixel store modes.
+** The packed array format from the server is LSB_FIRST = FALSE,
+** SWAP_BYTES = the current pixel storage pack mode, and ALIGNMENT = 4.
+** Named __glEmptyImage() because it is the opposite of __glFillImage().
+*/
+/* ARGSUSED */
+void __glEmptyImage(__GLXcontext *gc, GLint dim, GLint width, GLint height,
+ GLint depth, GLenum format, GLenum type,
+ const GLubyte *sourceImage, GLvoid *userdata)
+{
+ const __GLXattribute * state = gc->client_state_private;
+ GLint rowLength = state->storePack.rowLength;
+ GLint imageHeight = state->storePack.imageHeight;
+ GLint alignment = state->storePack.alignment;
+ GLint skipPixels = state->storePack.skipPixels;
+ GLint skipRows = state->storePack.skipRows;
+ GLint skipImages = state->storePack.skipImages;
+ GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
+ GLint elementsPerRow, sourceRowSize, sourcePadding, h, i;
+ GLint imageSize, rowsPerImage;
+ GLubyte *start, *iter, *itera;
+
+ if (type == GL_BITMAP) {
+ EmptyBitmap(gc, width, height, format, sourceImage, userdata);
+ } else {
+ components = __glElementsPerGroup(format,type);
+ if (rowLength > 0) {
+ groupsPerRow = rowLength;
+ } else {
+ groupsPerRow = width;
+ }
+ if (imageHeight > 0) {
+ rowsPerImage = imageHeight;
+ } else {
+ rowsPerImage = height;
+ }
+ elementSize = __glBytesPerElement(type);
+ groupSize = elementSize * components;
+ rowSize = groupsPerRow * groupSize;
+ padding = (rowSize % alignment);
+ if (padding) {
+ rowSize += alignment - padding;
+ }
+ sourceRowSize = width * groupSize;
+ sourcePadding = (sourceRowSize % 4);
+ if (sourcePadding) {
+ sourceRowSize += 4 - sourcePadding;
+ }
+ imageSize = sourceRowSize * rowsPerImage;
+ start = ((GLubyte*) userdata) + skipImages * imageSize +
+ skipRows * rowSize + skipPixels * groupSize;
+ elementsPerRow = width * components;
+
+ itera = start;
+ for (h = 0; h < depth; h++) {
+ if ((rowSize == sourceRowSize) && (sourcePadding == 0)) {
+ /* Ha! This is mondo easy! */
+ __GLX_MEM_COPY(itera, sourceImage,
+ elementsPerRow * elementSize * height);
+ sourceImage += elementsPerRow * elementSize * height;
+ } else {
+ iter = itera;
+ for (i = 0; i < height; i++) {
+ __GLX_MEM_COPY(iter, sourceImage,
+ elementsPerRow * elementSize);
+ sourceImage += sourceRowSize;
+ iter += rowSize;
+ }
+ }
+ itera += imageSize;
+ }
+ }
+}