276 lines
10 KiB
C++
276 lines
10 KiB
C++
#include "PNGReadWrite.hpp"
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#include <memory>
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#include <cstdio>
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#include <png.h>
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#include <boost/log/trivial.hpp>
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#include <boost/nowide/cstdio.hpp>
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namespace Slic3r { namespace png {
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struct PNGDescr {
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png_struct *png = nullptr; png_info *info = nullptr;
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PNGDescr() = default;
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PNGDescr(const PNGDescr&) = delete;
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PNGDescr(PNGDescr&&) = delete;
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PNGDescr& operator=(const PNGDescr&) = delete;
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PNGDescr& operator=(PNGDescr&&) = delete;
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~PNGDescr()
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{
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if (png && info) png_destroy_info_struct(png, &info);
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if (png) png_destroy_read_struct( &png, nullptr, nullptr);
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}
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};
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bool is_png(const ReadBuf &rb)
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{
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static const constexpr int PNG_SIG_BYTES = 8;
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#if PNG_LIBPNG_VER_MINOR <= 2
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// Earlier libpng versions had png_sig_cmp(png_bytep, ...) which is not
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// a const pointer. It is not possible to cast away the const qualifier from
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// the input buffer so... yes... life is challenging...
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png_byte buf[PNG_SIG_BYTES];
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auto inbuf = static_cast<const std::uint8_t *>(rb.buf);
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std::copy(inbuf, inbuf + PNG_SIG_BYTES, buf);
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#else
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auto buf = static_cast<png_const_bytep>(rb.buf);
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#endif
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return rb.sz >= PNG_SIG_BYTES && !png_sig_cmp(buf, 0, PNG_SIG_BYTES);
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}
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// Buffer read callback for libpng. It provides an allocated output buffer and
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// the amount of data it desires to read from the input.
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static void png_read_callback(png_struct *png_ptr,
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png_bytep outBytes,
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png_size_t byteCountToRead)
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{
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// Retrieve our input buffer through the png_ptr
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auto reader = static_cast<IStream *>(png_get_io_ptr(png_ptr));
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if (!reader || !reader->is_ok()) return;
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reader->read(static_cast<std::uint8_t *>(outBytes), byteCountToRead);
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}
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bool decode_png(IStream &in_buf, ImageGreyscale &out_img)
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{
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static const constexpr int PNG_SIG_BYTES = 8;
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std::vector<png_byte> sig(PNG_SIG_BYTES, 0);
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in_buf.read(sig.data(), PNG_SIG_BYTES);
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if (!png_check_sig(sig.data(), PNG_SIG_BYTES))
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return false;
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PNGDescr dsc;
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dsc.png = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr,
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nullptr);
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if(!dsc.png) return false;
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dsc.info = png_create_info_struct(dsc.png);
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if(!dsc.info) return false;
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png_set_read_fn(dsc.png, static_cast<void *>(&in_buf), png_read_callback);
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// Tell that we have already read the first bytes to check the signature
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png_set_sig_bytes(dsc.png, PNG_SIG_BYTES);
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png_read_info(dsc.png, dsc.info);
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out_img.cols = png_get_image_width(dsc.png, dsc.info);
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out_img.rows = png_get_image_height(dsc.png, dsc.info);
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size_t color_type = png_get_color_type(dsc.png, dsc.info);
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size_t bit_depth = png_get_bit_depth(dsc.png, dsc.info);
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if (color_type != PNG_COLOR_TYPE_GRAY || bit_depth != 8)
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return false;
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out_img.buf.resize(out_img.rows * out_img.cols);
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auto readbuf = static_cast<png_bytep>(out_img.buf.data());
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for (size_t r = 0; r < out_img.rows; ++r)
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png_read_row(dsc.png, readbuf + r * out_img.cols, nullptr);
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return true;
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}
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// Down to earth function to store a packed RGB image to file. Mostly useful for debugging purposes.
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// Based on https://www.lemoda.net/c/write-png/
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// png_color_type is PNG_COLOR_TYPE_RGB or PNG_COLOR_TYPE_GRAY
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//FIXME maybe better to use tdefl_write_image_to_png_file_in_memory() instead?
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static bool write_rgb_or_gray_to_file(const char *file_name_utf8, size_t width, size_t height, int png_color_type, const uint8_t *data)
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{
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bool result = false;
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// Forward declaration due to the gotos.
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png_structp png_ptr = nullptr;
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png_infop info_ptr = nullptr;
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png_byte **row_pointers = nullptr;
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FILE *fp = boost::nowide::fopen(file_name_utf8, "wb");
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if (! fp) {
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BOOST_LOG_TRIVIAL(error) << "write_png_file: File could not be opened for writing: " << file_name_utf8;
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goto fopen_failed;
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}
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
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if (! png_ptr) {
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BOOST_LOG_TRIVIAL(error) << "write_png_file: png_create_write_struct() failed";
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goto png_create_write_struct_failed;
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (! info_ptr) {
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BOOST_LOG_TRIVIAL(error) << "write_png_file: png_create_info_struct() failed";
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goto png_create_info_struct_failed;
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}
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// Set up error handling.
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if (setjmp(png_jmpbuf(png_ptr))) {
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BOOST_LOG_TRIVIAL(error) << "write_png_file: setjmp() failed";
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goto png_failure;
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}
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// Set image attributes.
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png_set_IHDR(png_ptr,
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info_ptr,
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png_uint_32(width),
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png_uint_32(height),
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8, // depth
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png_color_type,
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PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT);
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// Initialize rows of PNG.
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row_pointers = reinterpret_cast<png_byte**>(::png_malloc(png_ptr, height * sizeof(png_byte*)));
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{
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int line_width = width;
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if (png_color_type == PNG_COLOR_TYPE_RGB)
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line_width *= 3;
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for (size_t y = 0; y < height; ++ y) {
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auto row = reinterpret_cast<png_byte*>(::png_malloc(png_ptr, line_width));
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row_pointers[y] = row;
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memcpy(row, data + line_width * y, line_width);
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}
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}
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// Write the image data to "fp".
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png_init_io(png_ptr, fp);
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png_set_rows(png_ptr, info_ptr, row_pointers);
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png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, nullptr);
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for (size_t y = 0; y < height; ++ y)
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png_free(png_ptr, row_pointers[y]);
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png_free(png_ptr, row_pointers);
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result = true;
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png_failure:
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png_create_info_struct_failed:
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::png_destroy_write_struct(&png_ptr, &info_ptr);
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png_create_write_struct_failed:
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::fclose(fp);
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fopen_failed:
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return result;
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}
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bool write_rgb_to_file(const char *file_name_utf8, size_t width, size_t height, const uint8_t *data_rgb)
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{
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return write_rgb_or_gray_to_file(file_name_utf8, width, height, PNG_COLOR_TYPE_RGB, data_rgb);
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}
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bool write_rgb_to_file(const std::string &file_name_utf8, size_t width, size_t height, const uint8_t *data_rgb)
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{
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return write_rgb_to_file(file_name_utf8.c_str(), width, height, data_rgb);
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}
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bool write_rgb_to_file(const std::string &file_name_utf8, size_t width, size_t height, const std::vector<uint8_t> &data_rgb)
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{
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assert(width * height * 3 == data_rgb.size());
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return write_rgb_to_file(file_name_utf8.c_str(), width, height, data_rgb.data());
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}
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bool write_gray_to_file(const char *file_name_utf8, size_t width, size_t height, const uint8_t *data_gray)
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{
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return write_rgb_or_gray_to_file(file_name_utf8, width, height, PNG_COLOR_TYPE_GRAY, data_gray);
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}
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bool write_gray_to_file(const std::string &file_name_utf8, size_t width, size_t height, const uint8_t *data_gray)
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{
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return write_gray_to_file(file_name_utf8.c_str(), width, height, data_gray);
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}
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bool write_gray_to_file(const std::string &file_name_utf8, size_t width, size_t height, const std::vector<uint8_t> &data_gray)
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{
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assert(width * height == data_gray.size());
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return write_gray_to_file(file_name_utf8.c_str(), width, height, data_gray.data());
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}
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// Scaled variants are mostly useful for debugging purposes, for example to export images of low resolution distance fileds.
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// Scaling is done by multiplying rows and columns without any smoothing to emphasise the original pixels.
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// png_color_type is PNG_COLOR_TYPE_RGB or PNG_COLOR_TYPE_GRAY
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static bool write_rgb_or_gray_to_file_scaled(const char *file_name_utf8, size_t width, size_t height, int png_color_type, const uint8_t *data, size_t scale)
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{
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if (scale <= 1)
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return write_rgb_or_gray_to_file(file_name_utf8, width, height, png_color_type, data);
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else {
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size_t pixel_bytes = png_color_type == PNG_COLOR_TYPE_RGB ? 3 : 1;
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size_t line_width = width * pixel_bytes;
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std::vector<uint8_t> scaled(line_width * height * scale * scale);
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uint8_t *dst = scaled.data();
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for (size_t r = 0; r < height; ++ r) {
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for (size_t repr = 0; repr < scale; ++ repr) {
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const uint8_t *row = data + line_width * r;
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for (size_t c = 0; c < width; ++ c) {
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for (size_t repc = 0; repc < scale; ++ repc)
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for (size_t b = 0; b < pixel_bytes; ++ b)
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*dst ++ = row[b];
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row += pixel_bytes;
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}
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}
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}
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return write_rgb_or_gray_to_file(file_name_utf8, width * scale, height * scale, png_color_type, scaled.data());
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}
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}
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bool write_rgb_to_file_scaled(const char *file_name_utf8, size_t width, size_t height, const uint8_t *data_rgb, size_t scale)
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{
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return write_rgb_or_gray_to_file_scaled(file_name_utf8, width, height, PNG_COLOR_TYPE_RGB, data_rgb, scale);
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}
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bool write_rgb_to_file_scaled(const std::string &file_name_utf8, size_t width, size_t height, const uint8_t *data_rgb, size_t scale)
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{
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return write_rgb_to_file_scaled(file_name_utf8.c_str(), width, height, data_rgb, scale);
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}
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bool write_rgb_to_file_scaled(const std::string &file_name_utf8, size_t width, size_t height, const std::vector<uint8_t> &data_rgb, size_t scale)
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{
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assert(width * height * 3 == data_rgb.size());
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return write_rgb_to_file_scaled(file_name_utf8.c_str(), width, height, data_rgb.data(), scale);
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}
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bool write_gray_to_file_scaled(const char *file_name_utf8, size_t width, size_t height, const uint8_t *data_gray, size_t scale)
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{
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return write_rgb_or_gray_to_file_scaled(file_name_utf8, width, height, PNG_COLOR_TYPE_GRAY, data_gray, scale);
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}
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bool write_gray_to_file_scaled(const std::string &file_name_utf8, size_t width, size_t height, const uint8_t *data_gray, size_t scale)
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{
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return write_gray_to_file_scaled(file_name_utf8.c_str(), width, height, data_gray, scale);
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}
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bool write_gray_to_file_scaled(const std::string &file_name_utf8, size_t width, size_t height, const std::vector<uint8_t> &data_gray, size_t scale)
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{
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assert(width * height == data_gray.size());
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return write_gray_to_file_scaled(file_name_utf8.c_str(), width, height, data_gray.data(), scale);
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}
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}} // namespace Slic3r::png
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