mirror of https://gitlab.freedesktop.org/mesa/mesa
439 lines
14 KiB
C
439 lines
14 KiB
C
/*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* SPDX-License-Identifier: SGI-B-2.0
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*/
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#include "packrender.h"
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static const GLubyte MsbToLsbTable[256] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
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};
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static const GLubyte LowBitsMask[9] = {
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0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff,
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};
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static const GLubyte HighBitsMask[9] = {
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0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff,
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};
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/*
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** Copy bitmap data from clients packed memory applying unpacking modes as the
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** data is transfered into the destImage buffer. Return in modes the
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** set of pixel modes that are to be done by the server.
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*/
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static void
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FillBitmap(struct glx_context * gc, GLint width, GLint height,
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GLenum format, const GLvoid * userdata, GLubyte * destImage)
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{
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const __GLXattribute *state = gc->client_state_private;
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GLint rowLength = state->storeUnpack.rowLength;
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GLint alignment = state->storeUnpack.alignment;
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GLint skipPixels = state->storeUnpack.skipPixels;
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GLint skipRows = state->storeUnpack.skipRows;
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GLint lsbFirst = state->storeUnpack.lsbFirst;
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GLint elementsLeft, bitOffset, currentByte, nextByte, highBitMask;
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GLint lowBitMask, i;
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GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
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const GLubyte *start, *iter;
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if (rowLength > 0) {
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groupsPerRow = rowLength;
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}
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else {
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groupsPerRow = width;
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}
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components = __glElementsPerGroup(format, GL_BITMAP);
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rowSize = (groupsPerRow * components + 7) >> 3;
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padding = (rowSize % alignment);
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if (padding) {
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rowSize += alignment - padding;
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}
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start = ((const GLubyte *) userdata) + skipRows * rowSize +
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((skipPixels * components) >> 3);
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bitOffset = (skipPixels * components) & 7;
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highBitMask = LowBitsMask[8 - bitOffset];
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lowBitMask = HighBitsMask[bitOffset];
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elementsPerRow = width * components;
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for (i = 0; i < height; i++) {
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elementsLeft = elementsPerRow;
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iter = start;
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while (elementsLeft) {
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/* First retrieve low bits from current byte */
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if (lsbFirst) {
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currentByte = MsbToLsbTable[iter[0]];
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}
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else {
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currentByte = iter[0];
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}
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if (bitOffset) {
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/* Need to read next byte to finish current byte */
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if (elementsLeft > (8 - bitOffset)) {
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if (lsbFirst) {
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nextByte = MsbToLsbTable[iter[1]];
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}
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else {
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nextByte = iter[1];
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}
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currentByte =
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((currentByte & highBitMask) << bitOffset) |
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((nextByte & lowBitMask) >> (8 - bitOffset));
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}
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else {
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currentByte = ((currentByte & highBitMask) << bitOffset);
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}
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}
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if (elementsLeft >= 8) {
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*destImage = currentByte;
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elementsLeft -= 8;
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}
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else {
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*destImage = currentByte & HighBitsMask[elementsLeft];
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elementsLeft = 0;
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}
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destImage++;
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iter++;
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}
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start += rowSize;
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}
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}
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/*
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** Extract array from user's data applying all pixel store modes.
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** The internal packed array format used has LSB_FIRST = FALSE and
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** ALIGNMENT = 1.
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*/
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void
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__glFillImage(struct glx_context * gc, GLint dim, GLint width, GLint height,
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GLint depth, GLenum format, GLenum type,
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const GLvoid * userdata, GLubyte * newimage, GLubyte * modes)
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{
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const __GLXattribute *state = gc->client_state_private;
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GLint rowLength = state->storeUnpack.rowLength;
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GLint imageHeight = state->storeUnpack.imageHeight;
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GLint alignment = state->storeUnpack.alignment;
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GLint skipPixels = state->storeUnpack.skipPixels;
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GLint skipRows = state->storeUnpack.skipRows;
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GLint skipImages = state->storeUnpack.skipImages;
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GLint swapBytes = state->storeUnpack.swapEndian;
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GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
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GLint elementsPerRow, imageSize, rowsPerImage, h, i, j, k;
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const GLubyte *start, *iter, *itera, *iterb, *iterc;
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GLubyte *iter2;
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if (type == GL_BITMAP) {
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FillBitmap(gc, width, height, format, userdata, newimage);
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}
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else {
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components = __glElementsPerGroup(format, type);
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if (rowLength > 0) {
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groupsPerRow = rowLength;
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}
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else {
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groupsPerRow = width;
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}
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if (imageHeight > 0) {
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rowsPerImage = imageHeight;
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}
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else {
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rowsPerImage = height;
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}
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elementSize = __glBytesPerElement(type);
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groupSize = elementSize * components;
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if (elementSize == 1)
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swapBytes = 0;
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rowSize = groupsPerRow * groupSize;
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padding = (rowSize % alignment);
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if (padding) {
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rowSize += alignment - padding;
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}
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imageSize = rowSize * rowsPerImage;
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start = ((const GLubyte *) userdata) + skipImages * imageSize +
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skipRows * rowSize + skipPixels * groupSize;
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iter2 = newimage;
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elementsPerRow = width * components;
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if (swapBytes) {
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itera = start;
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for (h = 0; h < depth; h++) {
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iterb = itera;
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for (i = 0; i < height; i++) {
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iterc = iterb;
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for (j = 0; j < elementsPerRow; j++) {
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for (k = 1; k <= elementSize; k++) {
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iter2[k - 1] = iterc[elementSize - k];
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}
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iter2 += elementSize;
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iterc += elementSize;
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}
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iterb += rowSize;
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}
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itera += imageSize;
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}
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}
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else {
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itera = start;
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for (h = 0; h < depth; h++) {
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if (rowSize == elementsPerRow * elementSize) {
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/* Ha! This is mondo easy! */
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__GLX_MEM_COPY(iter2, itera,
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elementsPerRow * elementSize * height);
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iter2 += elementsPerRow * elementSize * height;
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}
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else {
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iter = itera;
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for (i = 0; i < height; i++) {
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__GLX_MEM_COPY(iter2, iter, elementsPerRow * elementSize);
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iter2 += elementsPerRow * elementSize;
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iter += rowSize;
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}
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}
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itera += imageSize;
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}
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}
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}
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/* Setup store modes that describe what we just did */
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if (modes) {
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if (dim < 3) {
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(void) memcpy(modes, __glXDefaultPixelStore + 4, 20);
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}
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else {
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(void) memcpy(modes, __glXDefaultPixelStore + 0, 36);
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}
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}
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}
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/*
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** Empty a bitmap in LSB_FIRST=GL_FALSE and ALIGNMENT=4 format packing it
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** into the clients memory using the pixel store PACK modes.
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*/
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static void
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EmptyBitmap(struct glx_context * gc, GLint width, GLint height,
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GLenum format, const GLubyte * sourceImage, GLvoid * userdata)
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{
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const __GLXattribute *state = gc->client_state_private;
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GLint rowLength = state->storePack.rowLength;
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GLint alignment = state->storePack.alignment;
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GLint skipPixels = state->storePack.skipPixels;
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GLint skipRows = state->storePack.skipRows;
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GLint lsbFirst = state->storePack.lsbFirst;
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GLint components, groupsPerRow, rowSize, padding, elementsPerRow;
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GLint sourceRowSize, sourcePadding, sourceSkip;
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GLubyte *start, *iter;
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GLint elementsLeft, bitOffset, currentByte, highBitMask, lowBitMask;
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GLint writeMask, i;
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GLubyte writeByte;
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components = __glElementsPerGroup(format, GL_BITMAP);
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if (rowLength > 0) {
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groupsPerRow = rowLength;
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}
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else {
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groupsPerRow = width;
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}
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rowSize = (groupsPerRow * components + 7) >> 3;
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padding = (rowSize % alignment);
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if (padding) {
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rowSize += alignment - padding;
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}
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sourceRowSize = (width * components + 7) >> 3;
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sourcePadding = (sourceRowSize % 4);
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if (sourcePadding) {
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sourceSkip = 4 - sourcePadding;
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}
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else {
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sourceSkip = 0;
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}
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start = ((GLubyte *) userdata) + skipRows * rowSize +
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((skipPixels * components) >> 3);
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bitOffset = (skipPixels * components) & 7;
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highBitMask = LowBitsMask[8 - bitOffset];
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lowBitMask = HighBitsMask[bitOffset];
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elementsPerRow = width * components;
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for (i = 0; i < height; i++) {
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elementsLeft = elementsPerRow;
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iter = start;
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writeMask = highBitMask;
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writeByte = 0;
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while (elementsLeft) {
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/* Set up writeMask (to write to current byte) */
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if (elementsLeft + bitOffset < 8) {
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/* Need to trim writeMask */
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writeMask &= HighBitsMask[bitOffset + elementsLeft];
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}
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if (lsbFirst) {
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currentByte = MsbToLsbTable[iter[0]];
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}
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else {
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currentByte = iter[0];
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}
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if (bitOffset) {
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writeByte |= (sourceImage[0] >> bitOffset);
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currentByte = (currentByte & ~writeMask) |
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(writeByte & writeMask);
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writeByte = (sourceImage[0] << (8 - bitOffset));
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}
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else {
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currentByte = (currentByte & ~writeMask) |
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(sourceImage[0] & writeMask);
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}
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if (lsbFirst) {
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iter[0] = MsbToLsbTable[currentByte];
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}
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else {
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iter[0] = currentByte;
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}
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if (elementsLeft >= 8) {
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elementsLeft -= 8;
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}
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else {
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elementsLeft = 0;
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}
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sourceImage++;
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iter++;
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writeMask = 0xff;
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}
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if (writeByte) {
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/* Some data left over that still needs writing */
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writeMask &= lowBitMask;
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if (lsbFirst) {
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currentByte = MsbToLsbTable[iter[0]];
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}
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else {
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currentByte = iter[0];
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}
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currentByte = (currentByte & ~writeMask) | (writeByte & writeMask);
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if (lsbFirst) {
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iter[0] = MsbToLsbTable[currentByte];
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}
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else {
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iter[0] = currentByte;
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}
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}
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start += rowSize;
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sourceImage += sourceSkip;
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}
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}
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/*
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** Insert array into user's data applying all pixel store modes.
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** The packed array format from the server is LSB_FIRST = FALSE,
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** SWAP_BYTES = the current pixel storage pack mode, and ALIGNMENT = 4.
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** Named __glEmptyImage() because it is the opposite of __glFillImage().
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*/
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/* ARGSUSED */
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void
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__glEmptyImage(struct glx_context * gc, GLint dim, GLint width, GLint height,
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GLint depth, GLenum format, GLenum type,
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const GLubyte * sourceImage, GLvoid * userdata)
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{
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const __GLXattribute *state = gc->client_state_private;
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GLint rowLength = state->storePack.rowLength;
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GLint imageHeight = state->storePack.imageHeight;
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GLint alignment = state->storePack.alignment;
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GLint skipPixels = state->storePack.skipPixels;
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GLint skipRows = state->storePack.skipRows;
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GLint skipImages = state->storePack.skipImages;
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GLint components, elementSize, rowSize, padding, groupsPerRow, groupSize;
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GLint elementsPerRow, sourceRowSize, sourcePadding, h, i;
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GLint imageSize, rowsPerImage;
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GLubyte *start, *iter, *itera;
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if (type == GL_BITMAP) {
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EmptyBitmap(gc, width, height, format, sourceImage, userdata);
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}
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else {
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components = __glElementsPerGroup(format, type);
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if (rowLength > 0) {
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groupsPerRow = rowLength;
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}
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else {
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groupsPerRow = width;
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}
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if (imageHeight > 0) {
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rowsPerImage = imageHeight;
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}
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else {
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rowsPerImage = height;
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}
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elementSize = __glBytesPerElement(type);
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groupSize = elementSize * components;
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rowSize = groupsPerRow * groupSize;
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padding = (rowSize % alignment);
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if (padding) {
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rowSize += alignment - padding;
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}
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sourceRowSize = width * groupSize;
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sourcePadding = (sourceRowSize % 4);
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if (sourcePadding) {
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sourceRowSize += 4 - sourcePadding;
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}
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imageSize = sourceRowSize * rowsPerImage;
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start = ((GLubyte *) userdata) + skipImages * imageSize +
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skipRows * rowSize + skipPixels * groupSize;
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elementsPerRow = width * components;
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itera = start;
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for (h = 0; h < depth; h++) {
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if ((rowSize == sourceRowSize) && (sourcePadding == 0)) {
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/* Ha! This is mondo easy! */
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__GLX_MEM_COPY(itera, sourceImage,
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elementsPerRow * elementSize * height);
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sourceImage += elementsPerRow * elementSize * height;
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}
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else {
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iter = itera;
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for (i = 0; i < height; i++) {
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__GLX_MEM_COPY(iter, sourceImage,
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elementsPerRow * elementSize);
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sourceImage += sourceRowSize;
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iter += rowSize;
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}
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}
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itera += imageSize;
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}
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}
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}
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