leonetienne/BmpPP
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Now supporting more dib headers to read

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This commit is contained in:
Leonetienne 2022-03-06 02:08:34 +01:00
parent 4cb9c6d65d
commit f279ffb50f
2 changed files with 10 additions and 27 deletions
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1
Src/BMP.cpp
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@ -12,7 +12,6 @@ namespace Leonetienne::BmpPP {
return;
}
BMP::BMP(const std::string &filename) {
if(!Read(filename))
throw std::runtime_error("Unable to read bmp image!");

36
Src/BmpReader.cpp
View File

@ -48,8 +48,8 @@ namespace Leonetienne::BmpPP {
std::uint32_t height;
std::uint16_t bitsPerPixel;
// Check if what kind of dib header we're dealing with
// These are the two we're supporting (to read, at least).
// Check for what kind of dib header we're dealing with.
// Is it a BITMAPCOREHEADER or a variant of a BITMAPINFOHEADER?
if (dibHeaderSize == 12) {
// BITMAPCOREHEADER it is
@ -68,27 +68,14 @@ namespace Leonetienne::BmpPP {
// Read the bits per pixel
ReadBytes(ifs, bitsPerPixel);
}
else if (dibHeaderSize == 40) {
// BITMAPINFOHEADER it is
// Read the width and height (both 4-byte signed ints)
std::int32_t width_4byte_signed;
std::int32_t height_4byte_signed;
ReadBytes(ifs, width_4byte_signed);
ReadBytes(ifs, height_4byte_signed);
width = width_4byte_signed;
height = height_4byte_signed;
// Skip two useless bytes
ifs.ignore(2);
// Read the bits per pixel value
ReadBytes(ifs, bitsPerPixel);
}
else if (dibHeaderSize == 124) {
// BITMAPV5HEADER it is
else if (
(dibHeaderSize == 40) ||
(dibHeaderSize == 52) ||
(dibHeaderSize == 56) ||
(dibHeaderSize == 124) ||
(dibHeaderSize == 108)
) {
// This routine should work for all the variants of BITMAPINFOHEADERs
// Read the width and height
ReadBytes(ifs, width);
@ -134,9 +121,6 @@ namespace Leonetienne::BmpPP {
// Calculate how much padding there should be between each row
const std::size_t paddingBytesPerRow = (4 - ((width * numChannels) % 4)) % 4;
// Calculate how long bytes we should care about per row (so, excluding padding)
const std::size_t rowWidth = width * numChannels;
// Create the pixel buffer
std::vector<std::uint8_t> pixelArray;
pixelArray.resize(width * height * numChannels);