[3605] | 1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
---|
| 2 | /* |
---|
| 3 | * Copyright (C) 2004-2012 HUBzero Foundation, LLC |
---|
| 4 | * |
---|
| 5 | * Author: George A. Howlett <gah@purdue.edu> |
---|
| 6 | */ |
---|
| 7 | |
---|
| 8 | #include <cstdio> |
---|
| 9 | #include <cstdlib> |
---|
| 10 | #include <cstring> |
---|
| 11 | #include <cerrno> |
---|
| 12 | #include <sys/uio.h> |
---|
| 13 | #include <sys/types.h> |
---|
| 14 | #include <sys/stat.h> |
---|
| 15 | #include <fcntl.h> |
---|
| 16 | #include <unistd.h> |
---|
| 17 | |
---|
| 18 | #include "Trace.h" |
---|
| 19 | #include "PPMWriter.h" |
---|
| 20 | #ifdef USE_THREADS |
---|
| 21 | #include "ResponseQueue.h" |
---|
| 22 | #endif |
---|
| 23 | |
---|
| 24 | using namespace nv; |
---|
| 25 | |
---|
| 26 | #define PPM_MAXVAL 255 |
---|
| 27 | |
---|
| 28 | #ifdef USE_THREADS |
---|
| 29 | |
---|
| 30 | /** |
---|
| 31 | * \brief Writes image data as PPM binary data to the client. |
---|
| 32 | * |
---|
| 33 | * The PPM binary format is very simple. |
---|
| 34 | * |
---|
| 35 | * P6 w h 255\n |
---|
| 36 | * 3-byte RGB pixel data. |
---|
| 37 | * |
---|
| 38 | * The client (using the TkImg library) will do less work to unpack this |
---|
| 39 | * format, as opposed to BMP or PNG. |
---|
| 40 | * |
---|
| 41 | * Note that currently the image data has bottom to top scanlines. This |
---|
| 42 | * routine could be made even simpler (faster) if the image data had top |
---|
| 43 | * to bottom scanlines. |
---|
| 44 | * |
---|
| 45 | * \param[in] queue Pointer to ResponseQueue to write to |
---|
| 46 | * \param[in] cmdName Command name to send (byte length will be appended) |
---|
| 47 | * \param[in] data Image data |
---|
| 48 | * \param[in] width Width of image in pixels |
---|
| 49 | * \param[in] height Height of image in pixels |
---|
| 50 | */ |
---|
| 51 | void |
---|
| 52 | nv::queuePPM(ResponseQueue *queue, const char *cmdName, |
---|
| 53 | const unsigned char *data, int width, int height) |
---|
| 54 | { |
---|
| 55 | char header[200]; |
---|
| 56 | |
---|
| 57 | TRACE("Entering (%dx%d)\n", width, height); |
---|
| 58 | // Generate the PPM binary file header |
---|
| 59 | snprintf(header, sizeof(header), "P6 %d %d %d\n", width, height, |
---|
| 60 | PPM_MAXVAL); |
---|
| 61 | |
---|
| 62 | size_t headerLength = strlen(header); |
---|
| 63 | size_t dataLength = width * height * 3; |
---|
| 64 | |
---|
| 65 | char command[200]; |
---|
| 66 | snprintf(command, sizeof(command), "%s %lu\n", cmdName, |
---|
| 67 | (unsigned long)headerLength + dataLength); |
---|
| 68 | |
---|
| 69 | size_t cmdLength; |
---|
| 70 | cmdLength = strlen(command); |
---|
| 71 | |
---|
| 72 | size_t length = cmdLength + headerLength + dataLength; |
---|
| 73 | unsigned char *mesg = (unsigned char *)malloc(length); |
---|
| 74 | if (mesg == NULL) { |
---|
| 75 | ERROR("can't allocate %ld bytes for the image message", length); |
---|
| 76 | return; |
---|
| 77 | } |
---|
| 78 | memcpy(mesg, command, cmdLength); |
---|
| 79 | memcpy(mesg + cmdLength, header, headerLength); |
---|
| 80 | |
---|
| 81 | size_t bytesPerRow = width * 3; |
---|
| 82 | unsigned char *destRowPtr = mesg + length - bytesPerRow; |
---|
| 83 | unsigned char *srcRowPtr = const_cast<unsigned char *>(data); |
---|
| 84 | for (int y = 0; y < height; y++) { |
---|
| 85 | memcpy(destRowPtr, srcRowPtr, bytesPerRow); |
---|
| 86 | srcRowPtr += bytesPerRow; |
---|
| 87 | destRowPtr -= bytesPerRow; |
---|
| 88 | } |
---|
| 89 | |
---|
| 90 | Response *response; |
---|
| 91 | if (strncmp(cmdName, "nv>legend", 9) == 0) { |
---|
| 92 | response = new Response(Response::LEGEND); |
---|
| 93 | } else { |
---|
| 94 | response = new Response(Response::IMAGE); |
---|
| 95 | } |
---|
| 96 | response->setMessage(mesg, length, Response::DYNAMIC); |
---|
| 97 | queue->enqueue(response); |
---|
| 98 | TRACE("Leaving (%dx%d)\n", width, height); |
---|
| 99 | } |
---|
| 100 | #else |
---|
| 101 | |
---|
| 102 | /** |
---|
| 103 | * \brief Writes image data as PPM binary data to the client. |
---|
| 104 | * |
---|
| 105 | * The PPM binary format is very simple. |
---|
| 106 | * |
---|
| 107 | * P6 w h 255\n |
---|
| 108 | * 3-byte RGB pixel data. |
---|
| 109 | * |
---|
| 110 | * The client (using the TkImg library) will do less work to unpack this |
---|
| 111 | * format, as opposed to BMP or PNG. |
---|
| 112 | * |
---|
| 113 | * Note that currently the image data has bottom to top scanlines. This |
---|
| 114 | * routine could be made even simpler (faster) if the image data had top |
---|
| 115 | * to bottom scanlines. |
---|
| 116 | * |
---|
| 117 | * \param[in] fd File descriptor that will be written to |
---|
| 118 | * \param[in] cmdName Command name to send (byte length will be appended) |
---|
| 119 | * \param[in] data Image data |
---|
| 120 | * \param[in] width Width of image in pixels |
---|
| 121 | * \param[in] height Height of image in pixels |
---|
| 122 | */ |
---|
| 123 | void |
---|
| 124 | nv::writePPM(int fd, const char *cmdName, |
---|
| 125 | const unsigned char *data, int width, int height) |
---|
| 126 | { |
---|
| 127 | TRACE("Entering (%dx%d)\n", width, height); |
---|
| 128 | |
---|
| 129 | // Generate the PPM binary file header |
---|
| 130 | char header[200]; |
---|
| 131 | snprintf(header, sizeof(header), "P6 %d %d %d\n", width, height, |
---|
| 132 | PPM_MAXVAL); |
---|
| 133 | |
---|
| 134 | size_t headerLength = strlen(header); |
---|
| 135 | size_t dataLength = width * height * 3; |
---|
| 136 | |
---|
| 137 | char command[200]; |
---|
| 138 | snprintf(command, sizeof(command), "%s %lu\n", cmdName, |
---|
| 139 | (unsigned long)headerLength + dataLength); |
---|
| 140 | |
---|
| 141 | size_t numRecords = height + 2; |
---|
| 142 | struct iovec *iov = (struct iovec *)malloc(sizeof(struct iovec) * numRecords); |
---|
| 143 | |
---|
| 144 | // Write the command, then the image header and data. |
---|
| 145 | // Command |
---|
| 146 | iov[0].iov_base = command; |
---|
| 147 | iov[0].iov_len = strlen(command); |
---|
| 148 | // Header of image data |
---|
| 149 | iov[1].iov_base = header; |
---|
| 150 | iov[1].iov_len = headerLength; |
---|
| 151 | |
---|
| 152 | // Image data |
---|
| 153 | size_t bytesPerRow = width * 3; |
---|
| 154 | size_t rowLength = width * 3; |
---|
| 155 | unsigned char *srcRowPtr = const_cast<unsigned char *>(data); |
---|
| 156 | for (int y = height + 1; y >= 2; y--) { |
---|
| 157 | iov[y].iov_base = srcRowPtr; |
---|
| 158 | iov[y].iov_len = rowLength; |
---|
| 159 | srcRowPtr += bytesPerRow; |
---|
| 160 | } |
---|
| 161 | if (writev(fd, iov, numRecords) < 0) { |
---|
| 162 | ERROR("write failed: %s\n", strerror(errno)); |
---|
| 163 | } |
---|
| 164 | free(iov); |
---|
| 165 | |
---|
| 166 | TRACE("Leaving (%dx%d)\n", width, height); |
---|
| 167 | } |
---|
| 168 | |
---|
| 169 | #endif /*USE_THREADS*/ |
---|
| 170 | |
---|
| 171 | bool |
---|
| 172 | nv::writePPMFile(const char *path, |
---|
| 173 | const unsigned char *data, int width, int height) |
---|
| 174 | { |
---|
| 175 | // Open the named file for writing. |
---|
| 176 | int fd = creat(path, 0600); |
---|
| 177 | if (fd < 0) { |
---|
| 178 | ERROR("Can't open temporary image file \"%s\": %s", path, strerror(errno)); |
---|
| 179 | return false; |
---|
| 180 | } |
---|
| 181 | |
---|
| 182 | // Generate the PPM binary file header |
---|
| 183 | char header[200]; |
---|
| 184 | snprintf(header, sizeof(header), "P6 %d %d %d\n", width, height, |
---|
| 185 | PPM_MAXVAL); |
---|
| 186 | |
---|
| 187 | size_t headerLength = strlen(header); |
---|
| 188 | |
---|
| 189 | size_t numRecords = height + 1; |
---|
| 190 | struct iovec *iov = (struct iovec *)malloc(sizeof(struct iovec) * numRecords); |
---|
| 191 | |
---|
| 192 | // Add the PPM image header. |
---|
| 193 | iov[0].iov_base = header; |
---|
| 194 | iov[0].iov_len = headerLength; |
---|
| 195 | |
---|
| 196 | // Now add the image data, reversing the order of the rows. PPM is top-to-bottom. |
---|
| 197 | //size_t wordsPerRow = (width * 24 + 31) / 32; |
---|
| 198 | //size_t bytesPerRow = wordsPerRow * 4; |
---|
| 199 | size_t bytesPerRow = width * 3; |
---|
| 200 | size_t rowLength = width * 3; |
---|
| 201 | unsigned char *srcRowPtr = const_cast<unsigned char *>(data); |
---|
| 202 | for (int y = height; y >= 1; y--) { |
---|
| 203 | iov[y].iov_base = srcRowPtr; |
---|
| 204 | iov[y].iov_len = rowLength; |
---|
| 205 | srcRowPtr += bytesPerRow; |
---|
| 206 | } |
---|
| 207 | bool ret = true; |
---|
| 208 | if (writev(fd, iov, numRecords) < 0) { |
---|
| 209 | ERROR("writing image to \"%s\" failed: %s\n", path, strerror(errno)); |
---|
| 210 | ret = false; |
---|
| 211 | } |
---|
| 212 | close(fd); |
---|
| 213 | free(iov); |
---|
| 214 | return ret; |
---|
| 215 | } |
---|