nerdcruft/libcruft-util
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image: write all all components of a ppm

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This commit is contained in:
Danny Robson 2015-06-02 22:59:53 +10:00
parent 221e658ad4
commit ecbf774d4a
1 changed files with 6 additions and 3 deletions
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9
image.cpp
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@ -360,12 +360,14 @@ util::pgm::read (const boost::filesystem::path &path)
//-----------------------------------------------------------------------------
static void
write_netpbm (const uint8_t *restrict pixels,
size_t components,
size_t width,
size_t height,
size_t stride,
const boost::filesystem::path &path,
const char* MAGIC) {
CHECK (pixels);
CHECK_GT (components, 0);
CHECK_GT (width, 0);
CHECK_GE (stride, width);
CHECK_GT (height, 0);
@ -384,7 +386,8 @@ write_netpbm (const uint8_t *restrict pixels,
// Write the data rows
for (size_t y = 0; y < height; ++y) {
for (size_t x = 0; x < width; ++x)
output << pixels[y * stride + x];
for (size_t c = 0; c < components; ++c)
output << pixels[y * stride + x * components + c];
}
}
@ -407,7 +410,7 @@ util::pgm::write (const uint8_t *restrict pixels,
const boost::filesystem::path &path) {
// TODO: We should switch between P2 (ascii) and P5 (binary)
static const char MAGIC[] = "P5";
write_netpbm (pixels, width, height, stride, path, MAGIC);
write_netpbm (pixels, 1, width, height, stride, path, MAGIC);
}
@ -420,7 +423,7 @@ util::ppm::write (const uint8_t *restrict pixels,
const boost::filesystem::path &path) {
// TODO: We should switch between P3 (ascii) and P6 (binary)
static const char MAGIC[] = "P6";
write_netpbm (pixels, width, height, stride, path, MAGIC);
write_netpbm (pixels, 3, width, height, stride, path, MAGIC);
}