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implement Image::Convert and Image::Flip

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tobid7
2026-09-01 08:15:03 +02:00
parent 4d2470b0c6
commit 2984354884
5 changed files with 218 additions and 1 deletions
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source/image/image.cpp
+75 -1
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@@ -1,3 +1,4 @@
#include <pd/image/convert.hpp>
#include <pd/image/image.hpp>
#if defined(PD_INCLUDE_STB_IMAGE)
@@ -54,6 +55,53 @@ PD_API void Image::Copy(const std::vector<u8>& pixels, int w, int h, int bpp) {
pFormat = GuessFmtFromBpp(bpp);
}
PD_API void Image::Convert(Format dst) {
if (pFormat == dst) {
return;
} else if (pFormat == Format::RGB && dst == Format::BGR) {
ImgConvert::ReverseBuf(pData, 3, pSize.x, pSize.y);
pFormat = Format::BGR;
} else if (pFormat == Format::RGB && dst == Format::RGBA) {
std::vector<PD::u8> cpy = pData;
pData.resize(pSize.x * pSize.y * 4);
ImgConvert::RGB24toRGBA32(pData, cpy, pSize.x, pSize.y);
pFormat = Format::RGBA;
} else if (pFormat == Format::RGBA && dst == Format::RGB) {
std::vector<PD::u8> cpy = pData;
pData.resize(pSize.x * pSize.y * 3);
ImgConvert::RGB32toRGBA24(pData, cpy, pSize.x, pSize.y);
pFormat = Format::RGB;
} else if (pFormat == Format::RGBA && dst == Format::BGRA) {
for (int i = 0; i < (pSize.x * pSize.y * 4); i += 4) {
u8 _tmp = pData[i + 0];
pData[i + 0] = pData[i + 2];
pData[i + 2] = _tmp;
}
} else if (pFormat == Format::RGBA && dst == Format::RGB565) {
Convert(Format::RGB);
Convert(Format::RGB565);
} else if (pFormat == Format::RGB && dst == Format::RGB565) {
auto f = [](u8 r, u8 g, u8 b) -> u16 {
u16 _r = (r >> 3);
u16 _g = (g >> 2);
u16 _b = (b >> 3);
return (_r << 11) | (_g << 5) | _b;
};
std::vector<PD::u8> cpy = pData;
pData.resize(pSize.x * pSize.y * 2);
for (int y = 0; y < pSize.x; y++) {
for (int x = 0; x < pSize.y; x++) {
int src = (y * pSize.x + x) * 3;
int dst = (y * pSize.x + x) * 2;
u16 new_px = f(cpy[src + 0], cpy[src + 1], cpy[src + 2]);
pData[dst + 0] = new_px >> 8;
pData[dst + 1] = new_px & 0xff;
}
}
pFormat = Format::RGB565;
}
}
PD_API int Image::Format2Bpp(Format fmt) {
switch (fmt) {
case Format::RGBA:
@@ -84,7 +132,33 @@ PD_API Image::Format Image::GuessFmtFromBpp(int bpp) {
}
PD_API void Image::Flip(bool hz, bool vt) {
// TODO
auto bpp = Format2Bpp(pFormat);
int rlen = pSize.x * bpp; // calculate as less as possible
if (hz) {
for (int j = 0; j < pSize.y; j++) {
int roff = j * rlen;
for (int i = 0; i < pSize.x / 2; i++) {
int src = roff + (i * bpp);
int dst = roff + (pSize.x - 1 - i) * bpp;
for (int k = 0; k < bpp; k++) {
PD::u8 tmp = pData[dst + k];
pData[dst + k] = pData[src + k];
pData[src + k] = tmp;
}
}
}
}
if (vt) {
for (int j = 0; j < pSize.y / 2; j++) {
int rsrc = j * rlen;
int rdst = (pSize.y - 1 - j) * rlen;
for (int i = 0; i < rlen; i++) { // swap the entire row
PD::u8 tmp = pData[rdst + i];
pData[rdst + i] = pData[rsrc + i];
pData[rsrc + i] = tmp;
}
}
}
}
} // namespace PD