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fixed packer's off-by-one error with padding

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This commit is contained in:
Noel Berry 2022-01-09 13:51:23 -08:00
parent 168424039c
commit 53ebb40ffd
2 changed files with 33 additions and 33 deletions
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4
include/blah/images/packer.h
View File

@ -108,8 +108,8 @@ namespace Blah
Node* down; Node* down;
Node(); Node();
Node* Find(int w, int h); Node* find(int w, int h);
Node* Reset(const Recti& rect); Node* reset(const Recti& rect);
}; };
// whether the packer has any changes that require it to run again // whether the packer has any changes that require it to run again

62
src/images/packer.cpp
View File

@ -78,7 +78,7 @@ void Packer::add_entry(u64 id, int w, int h, const Color* pixels, const Recti& s
top = y; top = y;
goto JUMP_LEFT; goto JUMP_LEFT;
} }
JUMP_LEFT: JUMP_LEFT:
for (int x = source.x; x < source.x + source.w; x++) 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) for (int y = top, s = x + y * w; y < source.y + source.h; y++, s += w)
if (pixels[s].a > 0) if (pixels[s].a > 0)
@ -86,7 +86,7 @@ void Packer::add_entry(u64 id, int w, int h, const Color* pixels, const Recti& s
left = x; left = x;
goto JUMP_RIGHT; goto JUMP_RIGHT;
} }
JUMP_RIGHT: JUMP_RIGHT:
for (int x = source.x + source.w - 1; x >= left; x--) 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) for (int y = top, s = x + y * w; y < source.y + source.h; y++, s += w)
if (pixels[s].a > 0) if (pixels[s].a > 0)
@ -94,7 +94,7 @@ void Packer::add_entry(u64 id, int w, int h, const Color* pixels, const Recti& s
right = x + 1; right = x + 1;
goto JUMP_BOTTOM; goto JUMP_BOTTOM;
} }
JUMP_BOTTOM: JUMP_BOTTOM:
for (int y = source.y + source.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++) for (int x = left, s = x + y * w; x < right; x++, s++)
if (pixels[s].a > 0) if (pixels[s].a > 0)
@ -102,7 +102,7 @@ void Packer::add_entry(u64 id, int w, int h, const Color* pixels, const Recti& s
bottom = y + 1; bottom = y + 1;
goto JUMP_END; goto JUMP_END;
} }
JUMP_END:; JUMP_END:;
// pixels actually exist in this source // pixels actually exist in this source
if (right > left && bottom > top) if (right > left && bottom > top)
@ -160,9 +160,9 @@ void Packer::pack()
sources[index++] = &m_entries[i]; sources[index++] = &m_entries[i];
std::sort(sources.begin(), sources.end(), [](Packer::Entry* a, Packer::Entry* b) std::sort(sources.begin(), sources.end(), [](Packer::Entry* a, Packer::Entry* b)
{ {
return a->packed.w * a->packed.h > b->packed.w * b->packed.h; return a->packed.w * a->packed.h > b->packed.w * b->packed.h;
}); });
} }
// make sure the largest isn't too large // make sure the largest isn't too large
@ -188,7 +188,7 @@ void Packer::pack()
int from = packed; int from = packed;
int index = 0; int index = 0;
Node* root = nodes[index++].Reset(Recti(0, 0, sources[from]->packed.w + padding * 2 + spacing, sources[from]->packed.h + padding * 2 + spacing)); Node* root = nodes[index++].reset(Recti(0, 0, sources[from]->packed.w + padding * 2 + spacing, sources[from]->packed.h + padding * 2 + spacing));
while (packed < count) while (packed < count)
{ {
@ -201,7 +201,7 @@ void Packer::pack()
int w = sources[packed]->packed.w + padding * 2 + spacing; int w = sources[packed]->packed.w + padding * 2 + spacing;
int h = sources[packed]->packed.h + padding * 2 + spacing; int h = sources[packed]->packed.h + padding * 2 + spacing;
Node* node = root->Find(w, h); Node* node = root->find(w, h);
// try to expand // try to expand
if (node == nullptr) if (node == nullptr)
@ -216,18 +216,18 @@ void Packer::pack()
// grow right // grow right
if (shouldGrowRight || (!shouldGrowDown && canGrowRight)) if (shouldGrowRight || (!shouldGrowDown && canGrowRight))
{ {
Node* next = nodes[index++].Reset(Recti(0, 0, root->rect.w + w, root->rect.h)); Node* next = nodes[index++].reset(Recti(0, 0, root->rect.w + w, root->rect.h));
next->used = true; next->used = true;
next->down = root; next->down = root;
next->right = node = nodes[index++].Reset(Recti(root->rect.w, 0, w, root->rect.h)); next->right = node = nodes[index++].reset(Recti(root->rect.w, 0, w, root->rect.h));
root = next; root = next;
} }
// grow down // grow down
else else
{ {
Node* next = nodes[index++].Reset(Recti(0, 0, root->rect.w, root->rect.h + h)); Node* next = nodes[index++].reset(Recti(0, 0, root->rect.w, root->rect.h + h));
next->used = true; next->used = true;
next->down = node = nodes[index++].Reset(Recti(0, root->rect.h, root->rect.w, h)); next->down = node = nodes[index++].reset(Recti(0, root->rect.h, root->rect.w, h));
next->right = root; next->right = root;
root = next; root = next;
} }
@ -240,8 +240,8 @@ void Packer::pack()
// add // add
node->used = true; node->used = true;
node->down = nodes[index++].Reset(Recti(node->rect.x, node->rect.y + h, node->rect.w, node->rect.h - h)); node->down = nodes[index++].reset(Recti(node->rect.x, node->rect.y + h, node->rect.w, node->rect.h - h));
node->right = nodes[index++].Reset(Recti(node->rect.x + w, node->rect.y, node->rect.w - w, h)); node->right = nodes[index++].reset(Recti(node->rect.x + w, node->rect.y, node->rect.w - w, h));
sources[packed]->packed.x = node->rect.x + padding; sources[packed]->packed.x = node->rect.x + padding;
sources[packed]->packed.y = node->rect.y + padding; sources[packed]->packed.y = node->rect.y + padding;
@ -249,25 +249,25 @@ void Packer::pack()
} }
// get page size // get page size
int pageWidth, pageHeight; int page_width, page_height;
if (power_of_two) if (power_of_two)
{ {
pageWidth = 2; page_width = 2;
pageHeight = 2; page_height = 2;
while (pageWidth < root->rect.w) while (page_width < root->rect.w)
pageWidth *= 2; page_width *= 2;
while (pageHeight < root->rect.h) while (page_height < root->rect.h)
pageHeight *= 2; page_height *= 2;
} }
else else
{ {
pageWidth = root->rect.w; page_width = root->rect.w;
pageHeight = root->rect.h; page_height = root->rect.h;
} }
// create each page // create each page
{ {
pages.emplace_back(pageWidth, pageHeight); pages.emplace_back(page_width, page_height);
// copy image data to image // copy image data to image
for (int i = from; i < packed; i++) for (int i = from; i < packed; i++)
@ -283,8 +283,8 @@ void Packer::pack()
if (padding > 0) if (padding > 0)
{ {
Image& image = pages[page]; Image& image = pages[page];
for (int x = -padding; x < dst.w + padding * 2; x++) for (int x = -padding; x < dst.w + padding; x++)
for (int y = -padding; y < dst.h + padding * 2; y++) for (int y = -padding; y < dst.h + padding; y++)
{ {
int sx = (x < 0 ? 0 : (x > dst.w - 1 ? dst.w - 1 : x)); int sx = (x < 0 ? 0 : (x > dst.w - 1 ? dst.w - 1 : x));
int sy = (y < 0 ? 0 : (y > dst.h - 1 ? dst.h - 1 : y)); int sy = (y < 0 ? 0 : (y > dst.h - 1 ? dst.h - 1 : y));
@ -325,21 +325,21 @@ void Packer::dispose()
Packer::Node::Node() Packer::Node::Node()
: used(false), rect(0, 0, 0, 0), right(nullptr), down(nullptr) { } : used(false), rect(0, 0, 0, 0), right(nullptr), down(nullptr) { }
Packer::Node* Packer::Node::Find(int w, int h) Packer::Node* Packer::Node::find(int w, int h)
{ {
if (used) if (used)
{ {
Packer::Node* r = right->Find(w, h); Packer::Node* r = right->find(w, h);
if (r != nullptr) if (r != nullptr)
return r; return r;
return down->Find(w, h); return down->find(w, h);
} }
else if (w <= rect.w && h <= rect.h) else if (w <= rect.w && h <= rect.h)
return this; return this;
return nullptr; return nullptr;
} }
Packer::Node* Packer::Node::Reset(const Recti& rect) Packer::Node* Packer::Node::reset(const Recti& rect)
{ {
used = false; used = false;
this->rect = rect; this->rect = rect;