Sonstiges/TerminalImageViewer
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Added an option to turn off the character optimization step

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This commit is contained in:
stefan.haustein@gmail.com 2017-07-11 22:25:22 +02:00
parent 87eae54a08
commit 79b468fbbc
1 changed files with 51 additions and 37 deletions
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88
src/main/cpp/tiv.cpp
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@ -14,6 +14,7 @@ const int FLAG_FG = 1;
const int FLAG_BG = 2;
const int FLAG_MODE_256 = 4;
const int FLAG_24BIT = 8;
const int FLAG_NOOPT = 16;
const int COLOR_STEP_COUNT = 6;
const int COLOR_STEPS[COLOR_STEP_COUNT] = {0, 0x5f, 0x87, 0xaf, 0xd7, 0xff};
@ -125,12 +126,49 @@ struct CharData {
};
// Return a CharData struct with the given code point and corresponding averag fg and bg colors.
CharData getCharData(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;
fg_count++;
} else {
avg = result.bgColor;
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;
}
// Find the best character and colors for a 4x8 part of the image at the given position
CharData getCharData(const cimg_library::CImg<unsigned char> & image, int x0, int y0) {
int min[3] = {255, 255, 255};
int max[3] = {0};
CharData result;
// Determine the minimum and maximum value for each color channel
for (int y = 0; y < 8; y++) {
for (int x = 0; x < 4; x++) {
@ -170,51 +208,21 @@ CharData getCharData(const cimg_library::CImg<unsigned char> & image, int x0, in
// including the inverted bitmaps.
int best_diff = 8;
unsigned int best_pattern = 0x0000ffff;
result.codePoint = 0x2584;
int codepoint = 0x2584;
for (int i = 0; BITMAPS[i + 1] != 0; i += 2) {
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.
result.codePoint = BITMAPS[i + 1];
codepoint = BITMAPS[i + 1];
best_diff = diff;
}
pattern = ~pattern;
}
}
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 (best_pattern & mask) {
avg = result.fgColor;
fg_count++;
} else {
avg = result.bgColor;
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;
return getCharData(image, x0, y0, codepoint, best_pattern);
}
@ -295,10 +303,13 @@ void emitCodepoint(int codepoint) {
}
}
void emit_image(const cimg_library::CImg<unsigned char> & image, int flags) {
for (int y = 0; y < image.height() - 8; y += 8) {
for (int x = 0; x < image.width() - 4; x += 4) {
CharData charData = getCharData(image, x, y);
CharData charData = flags & FLAG_NOOPT
? getCharData(image, x, y, 0x2584, 0x0000ffff)
: getCharData(image, x, y);
emit_color(flags | FLAG_BG, charData.bgColor[0], charData.bgColor[1], charData.bgColor[2]);
emit_color(flags | FLAG_FG, charData.fgColor[0], charData.fgColor[1], charData.fgColor[2]);
emitCodepoint(charData.codePoint);
@ -310,6 +321,7 @@ void emit_image(const cimg_library::CImg<unsigned char> & image, int flags) {
void emit_usage() {
std::cerr << "Terminal Image Viewer" << std::endl << std::endl;
std::cerr << "usage: tiv [options] <image> [<image>...]" << std::endl << std::endl;
std::cerr << " -0 : No block character adjustment, always use top half block char." << std::endl;
std::cerr << " -256 : Use 256 color mode." << std::endl;
std::cerr << " -c <num> : Number of thumbnail columns in 'dir' mode (3)." << std::endl;
std::cerr << " -d : Force 'dir' mode. Automatially selected for more than one input." << std::endl;
@ -341,7 +353,9 @@ int main(int argc, char* argv[]) {
for (int i = 1; i < argc; i++) {
std::string arg(argv[i]);
if (arg == "-c") {
if (arg == "-0") {
flags |= FLAG_NOOPT;
} else if (arg == "-c") {
columns = std::stoi(argv[++i]);
} else if (arg == "-d") {
mode = THUMBNAILS;