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TerminalImageViewer/src/tiv.cpp
Aaron Liu c4e12b539a
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2023-12-06 16:04:41 -05:00

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/*
* Copyright (c) 2023 Aaron Liu
*
* This file is free software: you may copy, redistribute and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This file 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, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright (c) 2017—2021, Stefan Haustein
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <array>
#include <bitset>
#include <cmath>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <map>
#include <string>
#include <vector>
// CImg, the superior grafiks library
#define cimg_display 0
#include "CImg.h"
// First include for detecting console output size,
// everything else for exit codes
#ifdef _POSIX_VERSION
#include <sys/ioctl.h>
#include <sysexits.h>
#endif
#ifdef _WIN32
#include <windows.h>
// Following codes copied from /usr/include/sysexits.h,
// license: https://opensource.org/license/BSD-3-clause/
#define EX_OK 0 /* successful termination */
#define EX__BASE 64 /* base value for error messages */
#define EX_USAGE 64 /* command line usage error */
#define EX_DATAERR 65 /* data format error */
#define EX_NOINPUT 66 /* cannot open input */
#define EX_SOFTWARE 70 /* internal software error */
#define EX_CANTCREAT 73 /* can't create (user) output file */
#define EX_IOERR 74 /* input/output error */
#define EX_TEMPFAIL 75 /* temp failure; user is invited to retry */
#define EX_NOPERM 77 /* permission denied */
#define EX_CONFIG 78 /* configuration error */
#endif
// using namespace std; // haha nope, bad style
// especially when we're also using the CImg namespace
// Implementation of flag representation for flags in the main() method
constexpr int FLAG_FG = 1;
constexpr int FLAG_BG = 2;
constexpr int FLAG_MODE_256 = 4; // Limit colors to 256-color mode
constexpr int FLAG_24BIT = 8; // 24-bit color mode
constexpr int FLAG_NOOPT = 16; // Only use the same half-block character
constexpr int FLAG_TELETEXT = 32; // Use teletext characters
// Steps (@TODO: Figure out what exactly they represent)
constexpr int COLOR_STEP_COUNT = 6;
constexpr int COLOR_STEPS[COLOR_STEP_COUNT] = {0, 0x5f, 0x87, 0xaf, 0xd7, 0xff};
constexpr int GRAYSCALE_STEP_COUNT = 24;
constexpr int GRAYSCALE_STEPS[GRAYSCALE_STEP_COUNT] = {
0x08, 0x12, 0x1c, 0x26, 0x30, 0x3a, 0x44, 0x4e, 0x58, 0x62, 0x6c, 0x76,
0x80, 0x8a, 0x94, 0x9e, 0xa8, 0xb2, 0xbc, 0xc6, 0xd0, 0xda, 0xe4, 0xee};
constexpr unsigned int BITMAPS[] = {
0x00000000, 0x00a0,
// Block graphics
// 0xffff0000, 0x2580, // upper 1/2; redundant with inverse lower 1/2
0x0000000f, 0x2581, // lower 1/8
0x000000ff, 0x2582, // lower 1/4
0x00000fff, 0x2583, 0x0000ffff, 0x2584, // lower 1/2
0x000fffff, 0x2585, 0x00ffffff, 0x2586, // lower 3/4
0x0fffffff, 0x2587,
// 0xffffffff, 0x2588, // full; redundant with inverse space
0xeeeeeeee, 0x258a, // left 3/4
0xcccccccc, 0x258c, // left 1/2
0x88888888, 0x258e, // left 1/4
0x0000cccc, 0x2596, // quadrant lower left
0x00003333, 0x2597, // quadrant lower right
0xcccc0000,
0x2598, // quadrant upper left
// 0xccccffff, 0x2599, // 3/4 redundant with inverse 1/4
0xcccc3333, 0x259a, // diagonal 1/2
// 0xffffcccc, 0x259b, // 3/4 redundant
// 0xffff3333, 0x259c, // 3/4 redundant
0x33330000, 0x259d, // quadrant upper right
// 0x3333cccc, 0x259e, // 3/4 redundant
// 0x3333ffff, 0x259f, // 3/4 redundant
// Line drawing subset: no double lines, no complex light lines
0x000ff000, 0x2501, // Heavy horizontal
0x66666666, 0x2503, // Heavy vertical
0x00077666, 0x250f, // Heavy down and right
0x000ee666, 0x2513, // Heavy down and left
0x66677000, 0x2517, // Heavy up and right
0x666ee000, 0x251b, // Heavy up and left
0x66677666, 0x2523, // Heavy vertical and right
0x666ee666, 0x252b, // Heavy vertical and left
0x000ff666, 0x2533, // Heavy down and horizontal
0x666ff000, 0x253b, // Heavy up and horizontal
0x666ff666, 0x254b, // Heavy cross
0x000cc000, 0x2578, // Bold horizontal left
0x00066000, 0x2579, // Bold horizontal up
0x00033000, 0x257a, // Bold horizontal right
0x00066000, 0x257b, // Bold horizontal down
0x06600660, 0x254f, // Heavy double dash vertical
0x000f0000, 0x2500, // Light horizontal
0x0000f000, 0x2500, //
0x44444444, 0x2502, // Light vertical
0x22222222, 0x2502,
0x000e0000, 0x2574, // light left
0x0000e000, 0x2574, // light left
0x44440000, 0x2575, // light up
0x22220000, 0x2575, // light up
0x00030000, 0x2576, // light right
0x00003000, 0x2576, // light right
0x00004444, 0x2577, // light down
0x00002222, 0x2577, // light down
// Misc technical
0x44444444, 0x23a2, // [ extension
0x22222222, 0x23a5, // ] extension
0x0f000000, 0x23ba, // Horizontal scanline 1
0x00f00000, 0x23bb, // Horizontal scanline 3
0x00000f00, 0x23bc, // Horizontal scanline 7
0x000000f0, 0x23bd, // Horizontal scanline 9
// Geometrical shapes. Tricky because some of them are too wide.
// 0x00ffff00, 0x25fe, // Black medium small square
0x00066000, 0x25aa, // Black small square
// 0x11224488, 0x2571, // diagonals
// 0x88442211, 0x2572,
// 0x99666699, 0x2573,
// 0x000137f0, 0x25e2, // Triangles
// 0x0008cef0, 0x25e3,
// 0x000fec80, 0x25e4,
// 0x000f7310, 0x25e5,
0, 0, // End marker for "regular" characters
// Teletext / legacy graphics 3x2 block character codes.
// Using a 3-2-3 pattern consistently, perhaps we should create automatic
// variations....
0xccc00000, 0xfb00, 0x33300000, 0xfb01, 0xfff00000, 0xfb02, 0x000cc000,
0xfb03, 0xccccc000, 0xfb04, 0x333cc000, 0xfb05, 0xfffcc000, 0xfb06,
0x00033000, 0xfb07, 0xccc33000, 0xfb08, 0x33333000, 0xfb09, 0xfff33000,
0xfb0a, 0x000ff000, 0xfb0b, 0xcccff000, 0xfb0c, 0x333ff000, 0xfb0d,
0xfffff000, 0xfb0e, 0x00000ccc, 0xfb0f,
0xccc00ccc, 0xfb10, 0x33300ccc, 0xfb11, 0xfff00ccc, 0xfb12, 0x000ccccc,
0xfb13, 0x333ccccc, 0xfb14, 0xfffccccc, 0xfb15, 0x00033ccc, 0xfb16,
0xccc33ccc, 0xfb17, 0x33333ccc, 0xfb18, 0xfff33ccc, 0xfb19, 0x000ffccc,
0xfb1a, 0xcccffccc, 0xfb1b, 0x333ffccc, 0xfb1c, 0xfffffccc, 0xfb1d,
0x00000333, 0xfb1e, 0xccc00333, 0xfb1f,
0x33300333, 0x1b20, 0xfff00333, 0x1b21, 0x000cc333, 0x1b22, 0xccccc333,
0x1b23, 0x333cc333, 0x1b24, 0xfffcc333, 0x1b25, 0x00033333, 0x1b26,
0xccc33333, 0x1b27, 0xfff33333, 0x1b28, 0x000ff333, 0x1b29, 0xcccff333,
0x1b2a, 0x333ff333, 0x1b2b, 0xfffff333, 0x1b2c, 0x00000fff, 0x1b2d,
0xccc00fff, 0x1b2e, 0x33300fff, 0x1b2f,
0xfff00fff, 0x1b30, 0x000ccfff, 0x1b31, 0xcccccfff, 0x1b32, 0x333ccfff,
0x1b33, 0xfffccfff, 0x1b34, 0x00033fff, 0x1b35, 0xccc33fff, 0x1b36,
0x33333fff, 0x1b37, 0xfff33fff, 0x1b38, 0x000fffff, 0x1b39, 0xcccfffff,
0x1b3a, 0x333fffff, 0x1b3b,
0, 1 // End marker for extended TELETEXT mode.
};
/**
* @brief Struct to represent a character to be drawn.
* @param fgColor RGB
* @param bgColor RGB
* @param codePoint The code point of the character to be drawn.
*/
struct CharData {
std::array<int, 3> fgColor = std::array<int, 3>{0, 0, 0};
std::array<int, 3> bgColor = std::array<int, 3>{0, 0, 0};
int codePoint;
};
// Return a CharData struct with the given code point and corresponding averag
// fg and bg colors.
CharData createCharData(const cimg_library::CImg<unsigned char> &image, int x0,
int y0, int codepoint, int pattern) {
CharData result;
result.codePoint = codepoint;
int fg_count = 0;
int bg_count = 0;
unsigned int mask = 0x80000000;
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 4; x++) {
int *avg;
if (pattern & mask) {
avg = result.fgColor.data();
fg_count++;
} else {
avg = result.bgColor.data();
bg_count++;
}
for (int i = 0; i < 3; i++) {
avg[i] += image(x0 + x, y0 + y, 0, i);
}
mask = mask >> 1;
}
}
// Calculate the average color value for each bucket
for (int i = 0; i < 3; i++) {
if (bg_count != 0) {
result.bgColor[i] /= bg_count;
}
if (fg_count != 0) {
result.fgColor[i] /= fg_count;
}
}
return result;
}
/**
* @brief Find the best character and colors
* for a 4x8 part of the image at the given position
*
* @param image
* @param x0
* @param y0
* @param flags
* @return CharData
*/
CharData findCharData(const cimg_library::CImg<unsigned char> &image, int x0,
int y0, const int &flags) {
int min[3] = {255, 255, 255};
int max[3] = {0};
std::map<long, int> count_per_color;
// Determine the minimum and maximum value for each color channel
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 4; x++) {
long color = 0;
for (int i = 0; i < 3; i++) {
int d = image(x0 + x, y0 + y, 0, i);
min[i] = std::min(min[i], d);
max[i] = std::max(max[i], d);
color = (color << 8) | d;
}
count_per_color[color]++;
}
}
std::multimap<int, long> color_per_count;
for (auto i = count_per_color.begin(); i != count_per_color.end(); ++i) {
color_per_count.insert(std::pair<int, long>(i->second, i->first));
}
auto iter = color_per_count.rbegin();
int count2 = iter->first;
long max_count_color_1 = iter->second;
long max_count_color_2 = max_count_color_1;
if ((++iter) != color_per_count.rend()) {
count2 += iter->first;
max_count_color_2 = iter->second;
}
unsigned int bits = 0;
bool direct = count2 > (8 * 4) / 2;
if (direct) {
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 4; x++) {
bits = bits << 1;
int d1 = 0;
int d2 = 0;
for (int i = 0; i < 3; i++) {
int shift = 16 - 8 * i;
int c1 = (max_count_color_1 >> shift) & 255;
int c2 = (max_count_color_2 >> shift) & 255;
int c = image(x0 + x, y0 + y, 0, i);
d1 += (c1 - c) * (c1 - c);
d2 += (c2 - c) * (c2 - c);
}
if (d1 > d2) {
bits |= 1;
}
}
}
} else {
// Determine the color channel with the greatest range.
int splitIndex = 0;
int bestSplit = 0;
for (int i = 0; i < 3; i++) {
if (max[i] - min[i] > bestSplit) {
bestSplit = max[i] - min[i];
splitIndex = i;
}
}
// We just split at the middle of the interval instead of computing the
// median.
int splitValue = min[splitIndex] + bestSplit / 2;
// Compute a bitmap using the given split and sum the color values for
// both buckets.
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 4; x++) {
bits = bits << 1;
if (image(x0 + x, y0 + y, 0, splitIndex) > splitValue) {
bits |= 1;
}
}
}
}
// Find the best bitmap match by counting the bits that don't match,
// including the inverted bitmaps.
int best_diff = 8;
unsigned int best_pattern = 0x0000ffff;
int codepoint = 0x2584;
bool inverted = false;
unsigned int end_marker = flags & FLAG_TELETEXT ? 1 : 0;
for (int i = 0; BITMAPS[i + 1] != end_marker; i += 2) {
// Skip all end markers
if (BITMAPS[i + 1] < 32) {
continue;
}
unsigned int pattern = BITMAPS[i];
for (int j = 0; j < 2; j++) {
int diff = (std::bitset<32>(pattern ^ bits)).count();
if (diff < best_diff) {
best_pattern = BITMAPS[i]; // pattern might be inverted.
codepoint = BITMAPS[i + 1];
best_diff = diff;
inverted = best_pattern != pattern;
}
pattern = ~pattern;
}
}
if (direct) {
CharData result;
if (inverted) {
long tmp = max_count_color_1;
max_count_color_1 = max_count_color_2;
max_count_color_2 = tmp;
}
for (int i = 0; i < 3; i++) {
int shift = 16 - 8 * i;
result.fgColor[i] = (max_count_color_2 >> shift) & 255;
result.bgColor[i] = (max_count_color_1 >> shift) & 255;
result.codePoint = codepoint;
}
return result;
}
return createCharData(image, x0, y0, codepoint, best_pattern);
}
int clamp_byte(int value) {
return value < 0 ? 0 : (value > 255 ? 255 : value);
}
double sqr(double n) { return n * n; }
int best_index(int value, const int STEPS[], int count) {
int best_diff = std::abs(STEPS[0] - value);
int result = 0;
for (int i = 1; i < count; i++) {
int diff = std::abs(STEPS[i] - value);
if (diff < best_diff) {
result = i;
best_diff = diff;
}
}
return result;
}
void emit_color(const int &flags, int r, int g, int b) {
r = clamp_byte(r);
g = clamp_byte(g);
b = clamp_byte(b);
bool bg = (flags & FLAG_BG) != 0;
if ((flags & FLAG_MODE_256) == 0) {
std::cout << (bg ? "\x1b[48;2;" : "\x1b[38;2;") << r << ';' << g << ';'
<< b << 'm';
return;
}
int ri = best_index(r, COLOR_STEPS, COLOR_STEP_COUNT);
int gi = best_index(g, COLOR_STEPS, COLOR_STEP_COUNT);
int bi = best_index(b, COLOR_STEPS, COLOR_STEP_COUNT);
int rq = COLOR_STEPS[ri];
int gq = COLOR_STEPS[gi];
int bq = COLOR_STEPS[bi];
int gray =
static_cast<int>(std::round(r * 0.2989f + g * 0.5870f + b * 0.1140f));
int gri = best_index(gray, GRAYSCALE_STEPS, GRAYSCALE_STEP_COUNT);
int grq = GRAYSCALE_STEPS[gri];
int color_index;
if (0.3 * sqr(rq - r) + 0.59 * sqr(gq - g) + 0.11 * sqr(bq - b) <
0.3 * sqr(grq - r) + 0.59 * sqr(grq - g) + 0.11 * sqr(grq - b)) {
color_index = 16 + 36 * ri + 6 * gi + bi;
} else {
color_index = 232 + gri; // 1..24 -> 232..255
}
std::cout << (bg ? "\x1B[48;5;" : "\u001B[38;5;") << color_index << "m";
}
void emitCodepoint(int codepoint) {
if (codepoint < 128) {
std::cout << static_cast<char>(codepoint);
} else if (codepoint < 0x7ff) {
std::cout << static_cast<char>(0xc0 | (codepoint >> 6));
std::cout << static_cast<char>(0x80 | (codepoint & 0x3f));
} else if (codepoint < 0xffff) {
std::cout << static_cast<char>(0xe0 | (codepoint >> 12));
std::cout << static_cast<char>(0x80 | ((codepoint >> 6) & 0x3f));
std::cout << static_cast<char>(0x80 | (codepoint & 0x3f));
} else if (codepoint < 0x10ffff) {
std::cout << static_cast<char>(0xf0 | (codepoint >> 18));
std::cout << static_cast<char>(0x80 | ((codepoint >> 12) & 0x3f));
std::cout << static_cast<char>(0x80 | ((codepoint >> 6) & 0x3f));
std::cout << static_cast<char>(0x80 | (codepoint & 0x3f));
} else {
std::cerr << "ERROR";
}
}
void emit_image(const cimg_library::CImg<unsigned char> &image,
const int &flags) {
CharData lastCharData;
for (int y = 0; y <= image.height() - 8; y += 8) {
for (int x = 0; x <= image.width() - 4; x += 4) {
CharData charData =
flags & FLAG_NOOPT
? createCharData(image, x, y, 0x2584, 0x0000ffff)
: findCharData(image, x, y, flags);
if (x == 0 || charData.bgColor != lastCharData.bgColor)
emit_color(flags | FLAG_BG, charData.bgColor[0],
charData.bgColor[1], charData.bgColor[2]);
if (x == 0 || charData.fgColor != lastCharData.fgColor)
emit_color(flags | FLAG_FG, charData.fgColor[0],
charData.fgColor[1], charData.fgColor[2]);
emitCodepoint(charData.codePoint);
lastCharData = charData;
}
std::cout << "\x1b[0m" << std::endl;
}
}
struct size {
size(unsigned int in_width, unsigned int in_height)
: width(in_width), height(in_height) {}
explicit size(cimg_library::CImg<unsigned int> img)
: width(img.width()), height(img.height()) {}
unsigned int width;
unsigned int height;
size scaled(double scale) { return size(width * scale, height * scale); }
size fitted_within(size container) {
double scale = std::min(container.width / static_cast<double>(width),
container.height / static_cast<double>(height));
return scaled(scale);
}
};
std::ostream &operator<<(std::ostream &stream, size sz) {
stream << sz.width << "x" << sz.height;
return stream;
}
/**
* @brief Wrapper around CImg<T>(const char*) constructor
* that always returns a CImg image with 3 channels (RGB)
*
* @param filename The file to construct a CImg object on
* @return cimg_library::CImg<unsigned char> Constructed CImg RGB image
*/
cimg_library::CImg<unsigned char> load_rgb_CImg(const char *const &filename) {
cimg_library::CImg<unsigned char> image(filename);
if (image.spectrum() == 1) {
// Greyscale. Just copy greyscale data to all channels
cimg_library::CImg<unsigned char> rgb_image(
image.width(), image.height(), image.depth(), 3);
for (unsigned int chn = 0; chn < 3; chn++) {
rgb_image.draw_image(0, 0, 0, chn, image);
}
return rgb_image;
}
return image;
}
// Implements --help
void emit_usage() {
std::cerr << R"(
Terminal Image Viewer v1.2.1
usage: tiv [options] <image> [<image>...]
-0 : No block character adjustment, always use top half block char.
-2, --256 : Use 256-bit colors. Needed to display properly on macOS Terminal.
-c <num> : Number of thumbnail columns in 'dir' mode (3 by default).
-d, --dir : Force 'dir' mode. Automatially selected for more than one input.
-f, --full: Force 'full' mode. Automatically selected for one input.
--help : Display this help text.
-h <num> : Set the maximum output height to <num> lines.
-w <num> : Set the maximum output width to <num> characters.
-x : Use new Unicode Teletext/legacy characters (experimental).)"
<< std::endl;
}
enum Mode { AUTO, THUMBNAILS, FULL_SIZE };
int main(int argc, char *argv[]) {
std::ios::sync_with_stdio(false); // apparently makes printing faster
// Platform-specific implementations for determining console size, better
// implementations are welcome Fallback sizes when unsuccesful
int maxWidth = 80;
int maxHeight = 24;
#ifdef __POSIX_VERSION
struct winsize w;
// If redirecting STDOUT to one file ( col or row == 0, or the previous
// ioctl call's failed )
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != 0 ||
(w.ws_col | w.ws_row) == 0) {
std::cerr << "Warning: failed to determine most reasonable size, "
"defaulting to 80x24"
<< std::endl;
} else {
maxWidth = w.ws_col * 4;
maxHeight = w.ws_row * 8;
}
#elif defined _WIN32
CONSOLE_SCREEN_BUFFER_INFO w;
if (GetConsoleScreenBufferInfo(
GetStdHandle(STD_OUTPUT_HANDLE),
&w)) { // just like powershell, but without the hyphens, hooray
maxWidth = w.dwSize.X * 4;
maxHeight = w.dwSize.Y * 8;
} else {
std::cerr << GetLastError();
std::cerr << "Warning: failed to determine most reasonable size, "
"defaulting to 80x24"
<< std::endl;
}
#else
std::cerr << "Warning: failed to determine most reasonable size: "
"unrecognized system, defaulting to 80x24"
<< std::endl;
#endif
// Reading input
char flags = 0; // bitwise representation of flags,
// see https://stackoverflow.com/a/14295472
Mode mode = AUTO; // either THUMBNAIL or FULL_SIZE
int columns = 3;
std::vector<std::string> file_names;
int ret = EX_OK; // The return code for the program
if (argc <= 1) {
emit_usage();
return 0;
}
for (int i = 1; i < argc; i++) {
std::string arg(argv[i]);
if (arg == "-0") {
flags |= FLAG_NOOPT;
} else if (arg == "-c") {
if (i < argc - 1) {
columns = std::stoi(argv[++i]);
} else {
std::cerr << "Error: -c requires a number" << std::endl;
ret = EX_USAGE;
}
} else if (arg == "-d" || arg == "--dir") {
mode = THUMBNAILS;
} else if (arg == "-f" || arg == "--full") {
mode = FULL_SIZE;
} else if (arg == "-w") {
if (i < argc - 1) {
maxWidth = 4 * std::stoi(argv[++i]);
} else {
std::cerr << "Error: -w requires a number" << std::endl;
ret = EX_USAGE;
}
} else if (arg == "-h") {
if (i < argc - 1)
maxHeight = 8 * std::stoi(argv[++i]);
else
emit_usage();
} else if (arg == "--256" || arg == "-2" || arg == "-256") {
flags |= FLAG_MODE_256;
} else if (arg == "--help" || arg == "-help") {
emit_usage();
} else if (arg == "-x") {
flags |= FLAG_TELETEXT;
} else if (arg[0] == '-') {
std::cerr << "Error: Unrecognized argument: " << arg << std::endl;
ret = EX_USAGE;
} else {
// Arguments that will be displayed
if (std::filesystem::is_directory(arg)) {
for (auto &p : std::filesystem::directory_iterator(arg))
if (std::filesystem::is_regular_file(p.path()))
file_names.push_back(p.path().string());
} else {
// Check if file can be opened
std::ifstream fin(arg.c_str());
if (fin) {
file_names.push_back(arg);
} else {
std::cerr << "Error: Cannot open '" << arg
<< "', permission issue?" << std::endl;
ret = EX_NOINPUT;
}
}
}
}
if (mode == FULL_SIZE || (mode == AUTO && file_names.size() == 1)) {
for (const auto &filename : file_names) {
try {
cimg_library::CImg<unsigned char> image =
load_rgb_CImg(filename.c_str());
if (image.width() > maxWidth || image.height() > maxHeight) {
// scale image down to fit terminal size
size new_size =
size(image).fitted_within(size(maxWidth, maxHeight));
image.resize(new_size.width, new_size.height, -100, -100,
5);
}
// the acutal magic which generates the output
emit_image(image, flags);
} catch (cimg_library::CImgIOException &e) {
std::cerr << "Error: '" << filename
<< "' has an unrecognized file format" << std::endl;
ret = EX_DATAERR;
}
}
} else { // Thumbnail mode
unsigned int index = 0;
int cw = (((maxWidth / 4) - 2 * (columns - 1)) / columns);
int tw = cw * 4;
cimg_library::CImg<unsigned char> image(
tw * columns + 2 * 4 * (columns - 1), tw, 1, 3);
size maxThumbSize(tw, tw);
while (index < file_names.size()) {
image.fill(0);
int count = 0;
std::string sb;
while (index < file_names.size() && count < columns) {
std::string name = file_names[index++];
try {
cimg_library::CImg<unsigned char> original =
load_rgb_CImg(name.c_str());
auto cut = name.find_last_of("/");
sb +=
cut == std::string::npos ? name : name.substr(cut + 1);
size newSize = size(original).fitted_within(maxThumbSize);
original.resize(newSize.width, newSize.height, 1, -100, 5);
image.draw_image(
count * (tw + 8) + (tw - newSize.width) / 2,
(tw - newSize.height) / 2, 0, 0, original);
count++;
unsigned int sl = count * (cw + 2);
sb.resize(sl - 2, ' ');
sb += " ";
} catch (std::exception &e) {
// Probably no image; ignore.
}
}
if (count) emit_image(image, flags);
std::cout << sb << std::endl << std::endl;
}
}
return ret;
}
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