52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
#include <daguerre/image.hpp>
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#include <cctype>
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namespace daguerre {
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static unsigned read_int(std::FILE *from) {
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unsigned out = 0;
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int ch;
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do
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ch = std::fgetc(from);
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while (std::isspace(ch));
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while (true) {
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if (ch == EOF)
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return out;
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if (ch < '0' || ch > '9') {
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std::ungetc(ch, from);
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return out;
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}
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out = out * 10 + (ch - '0');
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ch = std::fgetc(from);
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}
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}
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bool try_load_ppm(std::FILE *from, image<color24> &into) {
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if (std::fgetc(from) != 'P' || std::fgetc(from) != '6' ||
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std::fgetc(from) != '\n')
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return false;
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unsigned width = read_int(from);
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unsigned height = read_int(from);
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unsigned max = read_int(from);
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std::fgetc(from);//newline
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if (max != 255)
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return false;
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into = image<color24>(width, height);
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color24 *buffer = into.get_buffer();
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for (unsigned y = 0; y < height; ++y)
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for (unsigned x = 0; x < width; ++x) {
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buffer[y * width + x].r = std::fgetc(from);
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buffer[y * width + x].g = std::fgetc(from);
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buffer[y * width + x].b = std::fgetc(from);
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}
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return true;
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}
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}
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