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tobid7vx
2022-11-12 23:19:41 +01:00
parent 36e5676d9f
commit 8b70d0e9b7
44 changed files with 4869 additions and 4889 deletions
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98
source/bmpconverter.cpp
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@@ -1,29 +1,36 @@
#include <renderd7/bmpconverter.hpp>
namespace BitmapConverter{
namespace BitmapConverter {
//returns 0 if all went ok, non-0 if error
//output image is always given in RGBA (with alpha channel), even if it's a BMP without alpha channel
unsigned decodeBMP(std::vector<unsigned char>& image, unsigned& w, unsigned& h, const std::vector<unsigned char>& bmp) {
static const unsigned MINHEADER = 54; //minimum BMP header size
// returns 0 if all went ok, non-0 if error
// output image is always given in RGBA (with alpha channel), even if it's a BMP
// without alpha channel
unsigned decodeBMP(std::vector<unsigned char> &image, unsigned &w, unsigned &h,
const std::vector<unsigned char> &bmp) {
static const unsigned MINHEADER = 54; // minimum BMP header size
if(bmp.size() < MINHEADER) return -1;
if(bmp[0] != 'B' || bmp[1] != 'M') return 1; //It's not a BMP file if it doesn't start with marker 'BM'
unsigned pixeloffset = bmp[10] + 256 * bmp[11]; //where the pixel data starts
//read width and height from BMP header
if (bmp.size() < MINHEADER)
return -1;
if (bmp[0] != 'B' || bmp[1] != 'M')
return 1; // It's not a BMP file if it doesn't start with marker 'BM'
unsigned pixeloffset = bmp[10] + 256 * bmp[11]; // where the pixel data starts
// read width and height from BMP header
w = bmp[18] + bmp[19] * 256;
h = bmp[22] + bmp[23] * 256;
//read number of channels from BMP header
if(bmp[28] != 24 && bmp[28] != 32) return 2; //only 24-bit and 32-bit BMPs are supported.
// read number of channels from BMP header
if (bmp[28] != 24 && bmp[28] != 32)
return 2; // only 24-bit and 32-bit BMPs are supported.
unsigned numChannels = bmp[28] / 8;
//The amount of scanline bytes is width of image times channels, with extra bytes added if needed
//to make it a multiple of 4 bytes.
// The amount of scanline bytes is width of image times channels, with extra
// bytes added if needed to make it a multiple of 4 bytes.
unsigned scanlineBytes = w * numChannels;
if(scanlineBytes % 4 != 0) scanlineBytes = (scanlineBytes / 4) * 4 + 4;
if (scanlineBytes % 4 != 0)
scanlineBytes = (scanlineBytes / 4) * 4 + 4;
unsigned dataSize = scanlineBytes * h;
if(bmp.size() < dataSize + pixeloffset) return 3; //BMP file too small to contain all pixels
if (bmp.size() < dataSize + pixeloffset)
return 3; // BMP file too small to contain all pixels
image.resize(w * h * 4);
@@ -34,24 +41,25 @@ unsigned decodeBMP(std::vector<unsigned char>& image, unsigned& w, unsigned& h,
-each scanline has padding bytes to make it a multiple of 4 if needed
The 2D for loop below does all these 3 conversions at once.
*/
for(unsigned y = 0; y < h; y++)
for(unsigned x = 0; x < w; x++) {
//pixel start byte position in the BMP
unsigned bmpos = pixeloffset + (h - y - 1) * scanlineBytes + numChannels * x;
//pixel start byte position in the new raw image
unsigned newpos = 4 * y * w + 4 * x;
if(numChannels == 3) {
image[newpos + 0] = bmp[bmpos + 2]; //R
image[newpos + 1] = bmp[bmpos + 1]; //G
image[newpos + 2] = bmp[bmpos + 0]; //B
image[newpos + 3] = 255; //A
} else {
image[newpos + 0] = bmp[bmpos + 2]; //R
image[newpos + 1] = bmp[bmpos + 1]; //G
image[newpos + 2] = bmp[bmpos + 0]; //B
image[newpos + 3] = bmp[bmpos + 3]; //A
for (unsigned y = 0; y < h; y++)
for (unsigned x = 0; x < w; x++) {
// pixel start byte position in the BMP
unsigned bmpos =
pixeloffset + (h - y - 1) * scanlineBytes + numChannels * x;
// pixel start byte position in the new raw image
unsigned newpos = 4 * y * w + 4 * x;
if (numChannels == 3) {
image[newpos + 0] = bmp[bmpos + 2]; // R
image[newpos + 1] = bmp[bmpos + 1]; // G
image[newpos + 2] = bmp[bmpos + 0]; // B
image[newpos + 3] = 255; // A
} else {
image[newpos + 0] = bmp[bmpos + 2]; // R
image[newpos + 1] = bmp[bmpos + 1]; // G
image[newpos + 2] = bmp[bmpos + 0]; // B
image[newpos + 3] = bmp[bmpos + 3]; // A
}
}
}
return 0;
}
@@ -59,48 +67,44 @@ std::vector<unsigned char> ConvertFile(std::string filename) {
std::vector<unsigned char> bmp;
lodepng::load_file(bmp, filename);
std::vector<unsigned char> image;
unsigned w, h;
unsigned error = BitmapConverter::decodeBMP(image, w, h, bmp);
if(error) {
if (error) {
std::cout << "BMP decoding error " << error << std::endl;
}
std::vector<unsigned char> png;
error = lodepng::encode(png, image, w, h);
if(error) {
std::cout << "PNG encoding error " << error << ": " << lodepng_error_text(error) << std::endl;
if (error) {
std::cout << "PNG encoding error " << error << ": "
<< lodepng_error_text(error) << std::endl;
}
return png;
}
std::vector<unsigned char> ConvertData(std::vector<unsigned char> data) {
std::vector<unsigned char> image;
unsigned w, h;
unsigned error = BitmapConverter::decodeBMP(image, w, h, data);
if(error) {
if (error) {
std::cout << "BMP decoding error " << error << std::endl;
}
std::vector<unsigned char> png;
error = lodepng::encode(png, image, w, h);
if(error) {
std::cout << "PNG encoding error " << error << ": " << lodepng_error_text(error) << std::endl;
if (error) {
std::cout << "PNG encoding error " << error << ": "
<< lodepng_error_text(error) << std::endl;
}
return png;
}
}
} // namespace BitmapConverter