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packer can optionally pack a source rectangle of an image

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useful for packing tilesets
This commit is contained in:
Noel Berry 2021-04-11 20:57:09 -07:00
parent 459d2ad085
commit 0f04ff0803
2 changed files with 22 additions and 14 deletions
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5
include/blah/images/packer.h
View File

@ -82,6 +82,9 @@ namespace Blah
// add a new entry
void add(u64 id, const Image& bitmap);
// add a new entry
void add(u64 id, const Image& bitmap, const RectI& source);
// add a new entry
void add(u64 id, const FilePath& path);
@ -120,6 +123,6 @@ namespace Blah
Vector<Entry> m_entries;
// adds a new entry
void add_entry(u64 id, int w, int h, const Color* pixels);
void add_entry(u64 id, int w, int h, const Color* pixels, const RectI& source);
};
}

31
src/images/packer.cpp
View File

@ -43,12 +43,17 @@ Packer::~Packer()
void Packer::add(u64 id, int width, int height, const Color* pixels)
{
add_entry(id, width, height, pixels);
add_entry(id, width, height, pixels, RectI(0, 0, width, height));
}
void Packer::add(u64 id, const Image& image)
{
add_entry(id, image.width, image.height, image.pixels);
add_entry(id, image.width, image.height, image.pixels, RectI(0, 0, image.width, image.height));
}
void Packer::add(u64 id, const Image& image, const RectI& source)
{
add_entry(id, image.width, image.height, image.pixels, source);
}
void Packer::add(u64 id, const FilePath& path)
@ -56,41 +61,41 @@ void Packer::add(u64 id, const FilePath& path)
add(id, Image(path.cstr()));
}
void Packer::add_entry(u64 id, int w, int h, const Color* pixels)
void Packer::add_entry(u64 id, int w, int h, const Color* pixels, const RectI& source)
{
m_dirty = true;
Entry entry(id, RectI(0, 0, w, h));
Entry entry(id, RectI(0, 0, source.w, source.h));
// trim
int top = 0, left = 0, right = 0, bottom = 0;
// TOP:
for (int y = 0; y < h; y++)
for (int x = 0, s = y * w; x < w; x++, s++)
for (int y = source.y; y < source.y + source.h; y++)
for (int x = source.x, s = y * w; x < source.x + source.w; x++, s++)
if (pixels[s].a > 0)
{
top = y;
goto JUMP_LEFT;
}
JUMP_LEFT:
for (int x = 0; x < w; x++)
for (int y = top, s = x + y * w; y < h; y++, s += w)
for (int x = source.x; x < source.x + source.w; x++)
for (int y = top, s = x + y * w; y < source.y + source.h; y++, s += w)
if (pixels[s].a > 0)
{
left = x;
goto JUMP_RIGHT;
}
JUMP_RIGHT:
for (int x = w - 1; x >= left; x--)
for (int y = top, s = x + y * w; y < h; y++, s += w)
for (int x = source.x + source.w - 1; x >= left; x--)
for (int y = top, s = x + y * w; y < source.y + source.h; y++, s += w)
if (pixels[s].a > 0)
{
right = x + 1;
goto JUMP_BOTTOM;
}
JUMP_BOTTOM:
for (int y = h - 1; y >= top; y--)
for (int y = source.y + source.h - 1; y >= top; y--)
for (int x = left, s = x + y * w; x < right; x++, s++)
if (pixels[s].a > 0)
{
@ -105,8 +110,8 @@ void Packer::add_entry(u64 id, int w, int h, const Color* pixels)
entry.empty = false;
// store size
entry.frame.x = -left;
entry.frame.y = -top;
entry.frame.x = source.x - left;
entry.frame.y = source.y - top;
entry.packed.w = (right - left);
entry.packed.h = (bottom - top);