72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
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#include "bitmap-blit.h"
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#include <cstring>
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#include <algorithm>
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namespace msdf_atlas {
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#define BOUND_AREA() { \
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if (dx < 0) w += dx, sx -= dx, dx = 0; \
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if (dy < 0) h += dy, sy -= dy, dy = 0; \
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if (sx < 0) w += sx, dx -= sx, sx = 0; \
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if (sy < 0) h += sy, dy -= sy, sy = 0; \
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w = std::max(0, std::min(w, std::min(dst.width-dx, src.width-sx))); \
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h = std::max(0, std::min(h, std::min(dst.height-dy, src.height-sy))); \
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}
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template <typename T, int N>
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void blitSameType(const msdfgen::BitmapRef<T, N> &dst, const msdfgen::BitmapConstRef<T, N> &src, int dx, int dy, int sx, int sy, int w, int h) {
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BOUND_AREA();
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for (int y = 0; y < h; ++y)
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memcpy(dst(dx, dy+y), src(sx, sy+y), sizeof(T)*N*w);
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}
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#define BLIT_SAME_TYPE_IMPL(T, N) void blit(const msdfgen::BitmapRef<T, N> &dst, const msdfgen::BitmapConstRef<T, N> &src, int dx, int dy, int sx, int sy, int w, int h) { blitSameType(dst, src, dx, dy, sx, sy, w, h); }
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BLIT_SAME_TYPE_IMPL(byte, 1)
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BLIT_SAME_TYPE_IMPL(byte, 3)
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BLIT_SAME_TYPE_IMPL(byte, 4)
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BLIT_SAME_TYPE_IMPL(float, 1)
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BLIT_SAME_TYPE_IMPL(float, 3)
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BLIT_SAME_TYPE_IMPL(float, 4)
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void blit(const msdfgen::BitmapRef<byte, 1> &dst, const msdfgen::BitmapConstRef<float, 1> &src, int dx, int dy, int sx, int sy, int w, int h) {
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BOUND_AREA();
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for (int y = 0; y < h; ++y) {
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byte *dstPixel = dst(dx, dy+y);
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for (int x = 0; x < w; ++x) {
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const float *srcPixel = src(sx+x, sy+y);
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*dstPixel++ = msdfgen::pixelFloatToByte(*srcPixel);
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}
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}
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}
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void blit(const msdfgen::BitmapRef<byte, 3> &dst, const msdfgen::BitmapConstRef<float, 3> &src, int dx, int dy, int sx, int sy, int w, int h) {
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BOUND_AREA();
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for (int y = 0; y < h; ++y) {
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byte *dstPixel = dst(dx, dy+y);
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for (int x = 0; x < w; ++x) {
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const float *srcPixel = src(sx+x, sy+y);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[0]);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[1]);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[2]);
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}
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}
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}
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void blit(const msdfgen::BitmapRef<byte, 4> &dst, const msdfgen::BitmapConstRef<float, 4> &src, int dx, int dy, int sx, int sy, int w, int h) {
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BOUND_AREA();
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for (int y = 0; y < h; ++y) {
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byte *dstPixel = dst(dx, dy+y);
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for (int x = 0; x < w; ++x) {
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const float *srcPixel = src(sx+x, sy+y);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[0]);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[1]);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[2]);
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*dstPixel++ = msdfgen::pixelFloatToByte(srcPixel[3]);
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}
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}
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}
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}
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