update
This commit is contained in:
Andrew Haynes
+267
@@ -0,0 +1,267 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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unsigned int
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encoder(unsigned char r, unsigned char g, unsigned char b)
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{
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unsigned int color = 0;
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color |= b << 0;
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color |= g << 8;
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color |= r << 16;
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return color;
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}
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unsigned char
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decoder(unsigned int clr, int byte)
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{
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if (byte == 1) return (clr & 0x000000FF) >> 0;
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else if (byte == 2) return (clr & 0x0000FF00) >> 8;
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else if (byte == 3) return (clr & 0x00FF0000) >> 16;
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else if (byte == 4) return (clr & 0xFF000000) >> 24;
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return 0;
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}
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// unsigned int
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// decoder_int(unsigned int clr, int byte)
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// {
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// if (byte == 1) return (clr & 0x000000FF) >> 0;
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// else if (byte == 2) return (clr & 0x0000FF00) >> 8;
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// else if (byte == 3) return (clr & 0x00FF0000) >> 16;
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// else if (byte == 4) return (clr & 0xFF000000) >> 24;
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// return 0;
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// }
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unsigned int
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set_alpha(unsigned int clr, unsigned char alpha_value)
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{
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return (clr & 0x00FFFFFF) | alpha_value << 24;
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}
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unsigned int
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invert_rgb(unsigned int clr)
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{
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unsigned char alpha = (clr & 0xFF000000) >> 24;
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return ((~clr) & 0x00FFFFFF) | alpha << 24;
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}
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unsigned int
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swap_rb(unsigned int clr)
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{
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return (((clr & 0xFF00FF00) | ((decoder(clr, 3)) << 0) |
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((decoder(clr, 1) >> 0) << 16)));
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}
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unsigned int
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to_grayscale(unsigned int clr)
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{
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unsigned char alpha = decoder(clr, 4);
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unsigned char red = decoder(clr, 3);
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unsigned char green = decoder(clr, 2);
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unsigned char blue = decoder(clr, 1);
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int average = (red + green + blue) / 3;
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unsigned int mask = encoder(average, average, average);
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mask = set_alpha(mask, alpha);
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return mask;
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}
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unsigned int
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apply_threshold(unsigned int clr, unsigned char limit)
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{
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unsigned int mask = 0;
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unsigned char average = decoder(to_grayscale(clr), 1);
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if (average < limit) mask = encoder(0, 0, 0);
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else mask = encoder(255, 255, 255);
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mask = set_alpha(mask, decoder(clr, 4));
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return mask;
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}
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unsigned int
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adjust_brightness(unsigned int clr, float factor)
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{
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unsigned int red = decoder(clr, 3) * factor;
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unsigned int green = decoder(clr, 2) * factor;
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unsigned int blue = decoder(clr, 1) * factor;
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if (red > 255) red = 255;
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if (green > 255) green = 255;
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if (blue > 255) blue = 255;
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unsigned int mask = encoder(red, green, blue);
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mask = set_alpha(mask, decoder(clr, 4));
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return mask;
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}
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unsigned int
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apply_tint(unsigned int clr_a, unsigned int clr_b)
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{
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unsigned char blue = (decoder(clr_a, 1) + decoder(clr_b, 1)) / 2;
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unsigned char green = (decoder(clr_a, 2) + decoder(clr_b, 2)) / 2;
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unsigned char red = (decoder(clr_a, 3) + decoder(clr_b, 3)) / 2;
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return set_alpha(encoder(red, green, blue), decoder(clr_a, 4));
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}
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unsigned int
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apply_opacity(unsigned clr_a, unsigned int clr_b, float ratio)
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{
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unsigned char blue =
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(decoder(clr_a, 1) * (1 - ratio) + (decoder(clr_b, 1) * ratio));
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unsigned char green =
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(decoder(clr_a, 2) * (1 - ratio) + (decoder(clr_b, 2) * ratio));
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unsigned char red =
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(decoder(clr_a, 3) * (1 - ratio) + (decoder(clr_b, 3) * ratio));
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return set_alpha(encoder(red, green, blue), decoder(clr_a, 4));
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}
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unsigned int*
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ppm_encode(char* file, int* w, int* h, int* max_val, char* magic_number)
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{
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unsigned char r, g, b;
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FILE* fptr;
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fptr = fopen(file, "r");
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if (!fptr) return NULL;
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fscanf(fptr, "%s", magic_number);
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fscanf(fptr, "%d %d", w, h);
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fscanf(fptr, "%d", max_val);
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unsigned int* buf = malloc((*w) * (*h) * sizeof(unsigned int));
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if (!buf) return NULL;
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for (int i = 0; i < (*w * *h); i++)
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{
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fscanf(fptr, "%hhu %hhu %hhu", &r, &g, &b);
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unsigned int packed = encoder(r, g, b);
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buf[i] = set_alpha(packed, 255);
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}
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fclose(fptr);
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return buf;
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}
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void
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ppm_apply_brightness(unsigned int* buf, int buf_size, float factor)
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{
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for (int i = 0; i < buf_size; i++)
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{
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buf[i] = adjust_brightness(buf[i], factor);
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}
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}
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void
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ppm_decode(unsigned int* buf, int buf_size, char* name, int* w, int* h)
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{
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unsigned char red, green, blue;
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FILE* fptr = fopen(name, "w");
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if (!fptr) return;
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fprintf(fptr, "P3\n%d %d\n255\n", *w, *h);
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for (int i = 0; i < buf_size; i++)
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{
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red = decoder(buf[i], 3);
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green = decoder(buf[i], 2);
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blue = decoder(buf[i], 1);
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fprintf(fptr, "%d %d %d ", red, green, blue);
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if ((i + 1) % *w == 0)
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{
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fprintf(fptr, "\n");
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}
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}
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fclose(fptr);
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}
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unsigned int
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channel_mask(unsigned int clr, char keep)
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{
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unsigned int mask = 0;
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switch (keep)
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{
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case 'r':
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mask = encoder(decoder(clr, 3), 0, 0);
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break;
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case 'g':
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mask = encoder(0, decoder(clr, 2), 0);
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break;
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case 'b':
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mask = encoder(0, 0, decoder(clr, 1));
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break;
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}
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mask = set_alpha(mask, decoder(clr, 4));
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return mask;
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}
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unsigned int
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chromatic_circular_shift(unsigned int clr, int n)
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{
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unsigned int mask = 0;
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unsigned char r, g, b;
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r = decoder(clr, 3);
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g = decoder(clr, 2);
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b = decoder(clr, 1);
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r = (r << n) | (r >> (8 - n));
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g = (g << n) | (g >> (8 - n));
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b = (b << n) | (b >> (8 - n));
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mask = encoder(r, g, b);
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mask = set_alpha(mask, decoder(clr, 4));
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return mask;
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}
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unsigned int*
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horizontal_flip(unsigned int* buf, int size, int w) {
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}
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unsigned int*
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vertical_flip(unsigned int* buf, int size, int w, int h) {
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}
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void
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print_bits_int(unsigned int n)
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{
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for (int i = 31; i >= 0; i--)
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{
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if (i == 7 || i == 15 || i == 23) write(1, " ", 1);
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char bit = (n & (1 << i)) ? '1' : '0';
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write(1, &bit, 1);
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}
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write(1, "\n", 1);
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}
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void
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print_bits_char(unsigned char n)
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{
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for (int i = 7; i >= 0; i--)
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{
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char bit = (n & (1 << i)) ? '1' : '0';
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write(1, &bit, 1);
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}
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write(1, "\n", 1);
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}
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int
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main()
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{
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// unsigned int test = 40;
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// print_bits_int(test);
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// test = (test << 3) | (test >> (8 - 3));
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// print_bits_int(test);
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unsigned int color = encoder(200, 10, 50);
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color = set_alpha(color, 100);
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print_bits_int(color);
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// unsigned int channelled_color = channel_mask(color, 'g');
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color = chromatic_circular_shift(color, 3);
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print_bits_int(color);
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// int width, height;
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// char magic_number[3];
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// int max_val;
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//
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// unsigned int* buf =
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// ppm_encode("../test.ppm", &width, &height, &max_val,
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// magic_number);
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// ppm_apply_brightness(buf, (width * height), .5);
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// ppm_decode(buf, (width * height), "../new.ppm", &width, &height);
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// free(buf);
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return 0;
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}
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