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#include "UnityPrefix.h"
#include "SpriteUtility.h"
#if ENABLE_SPRITES
#include "Runtime/Geometry/SpriteMeshGenerator.h"
static const float kSpriteEdgeBias = 1.0f;
bool GetSpriteMeshRectPixelBounds (const Texture2D& texture, const Rectf& rectInaccurate, int& rectX, int& rectY, int& rectRight, int& rectBottom)
{
rectX = Floorf(rectInaccurate.x);
rectY = Floorf(rectInaccurate.y);
rectRight = Ceilf(rectInaccurate.GetRight());
rectBottom = Ceilf(rectInaccurate.GetBottom());
// Sanity check to see if out of texture rect or if error is more than 1 pixel for whole-texture sprites.
const bool errorX = (rectX < 0);
const bool errorY = (rectY < 0);
const bool errorR = (rectRight > texture.GetGLWidth() + 1);
const bool errorB = (rectBottom > texture.GetGLHeight() + 1);
const bool hasError = (errorX || errorY || errorR || errorB);
Assert(!hasError);
// In rare cases when a texture is downscaled to match the max texture size limit it might introduce an odd scaling factor, cause a 1 pixel error and grow beyond the texture size.
rectRight = std::min(rectRight, texture.GetGLWidth());
rectBottom = std::min(rectBottom, texture.GetGLHeight());
return hasError;
}
void GenerateSpriteOutline(PPtr<Texture2D> texture, float pixelsToUnits, const Rectf& rectInaccurate, const Vector2f& rectOffset, float detail, unsigned char alphaTolerance, bool holeDetection, unsigned int extrude, int simplifyMode, std::vector<dynamic_array<Vector2f> >* outLine, std::vector<SpriteVertex>* outVertices, std::vector<UInt16>* outIndices, Rectf* meshRect)
{
if(texture.IsNull())
return;
const int texW = texture->GetGLWidth();
const int texH = texture->GetGLHeight();
// Figure out what pixels to use.
// If a platform texture size limit is set, rectInaccurate will not define actual pixels.
int rectX, rectY, rectRight, rectBottom;
GetSpriteMeshRectPixelBounds(*texture, rectInaccurate, rectX, rectY, rectRight, rectBottom);
const int rectWidth = rectRight - rectX;
const int rectHeight = rectBottom - rectY;
const float rectAdjustX = rectInaccurate.x - rectX;
const float rectAdjustY = rectInaccurate.y - rectY;
// Extract rectangle
const int imageSize = rectWidth * rectHeight * sizeof(ColorRGBA32);
ColorRGBA32* imageData = (ColorRGBA32*)UNITY_MALLOC(kMemDefault, imageSize);
{
const int textureSize = texW * texH * sizeof(ColorRGBA32);
ColorRGBA32* texData = (ColorRGBA32*)UNITY_MALLOC(kMemDefault, textureSize);
texture->GetPixels32(0, texData);
for (int row = 0; row < rectHeight; ++row)
{
ColorRGBA32* dest = imageData + row * rectWidth;
ColorRGBA32* src = texData + (rectY + row) * texW + rectX;
UNITY_MEMCPY(dest, src, sizeof(ColorRGBA32) * rectWidth);
}
UNITY_FREE(kMemDefault, texData);
}
// Detect shape
const float hullTolerance = (detail>=0.0f) ? 1.0f - clamp01(detail) : detail;
extrude = clamp<unsigned int>(extrude, 0, 32);
SpriteMeshGenerator smg;
smg.MakeShape(imageData, rectWidth, rectHeight, hullTolerance, alphaTolerance, holeDetection, extrude, kSpriteEdgeBias, simplifyMode);
// Adjustments for offset and pixel-to-unity scale.
const float scale = 1.0 / pixelsToUnits;
const float scale_x = 1.0 / texW;
const float scale_y = 1.0 / texH;
const Vector2f oxy(float(rectWidth) * 0.5f + rectOffset.x - rectAdjustX, float(rectHeight) * 0.5f + rectOffset.y - rectAdjustY);
// Fill outline
if (outLine)
{
const std::vector<SpriteMeshGenerator::path>& paths = smg.GetPaths();
outLine->resize(paths.size());
int ci = 0;
for (std::vector<SpriteMeshGenerator::path>::const_iterator p = paths.begin(); p != paths.end(); ++p)
{
const SpriteMeshGenerator::path& path = *p;
const std::vector<SpriteMeshGenerator::vertex>& poly = path.m_path;
dynamic_array<Vector2f> finalPath;
finalPath.reserve(poly.size());
for (std::vector<SpriteMeshGenerator::vertex>::const_iterator it = poly.begin(); it != poly.end(); ++it)
{
Vector2f polyPoint = it->p;
Vector2f finalPoint((polyPoint.x-oxy.x)*scale, (polyPoint.y-oxy.y)*scale);
finalPath.push_back(finalPoint);
}
(*outLine)[ci++] = finalPath;
}
}
// Fill mesh
if (outVertices)
{
Assert(outIndices);
// Decompose outline
std::vector<Vector2f> vertices;
std::vector<int> indices;
smg.Decompose(&vertices, &indices);
if (indices.size() > 0)
{
outVertices->clear();
outIndices->clear();
// Assign indices
std::reverse(indices.begin(), indices.end());
outIndices->assign(indices.begin(), indices.end());
// Assign vertices
outVertices->reserve(vertices.size());
for (std::vector<SpriteMeshGenerator::vertex>::size_type i = 0; i < vertices.size(); ++i)
{
SpriteVertex v;
v.pos = Vector3f((vertices[i].x-oxy.x)*scale, (vertices[i].y-oxy.y)*scale, 0.0f);
v.uv = Vector2f((vertices[i].x+rectInaccurate.x)*scale_x, (vertices[i].y+rectInaccurate.y)*scale_y);
outVertices->push_back(v);
}
}
}
else
{
Assert(outIndices == NULL);
}
// Set mesh rect
if (meshRect)
{
if (!smg.FindBounds(*meshRect))
*meshRect = Rectf(rectX, rectY, rectWidth, rectHeight);
}
// Clean up
UNITY_FREE(kMemDefault, imageData);
}
void GetAABBVerticesForSprite (const AABB& aabb, Vector3f* outVertices)
{
outVertices[0] = aabb.m_Center + Vector3f (-aabb.m_Extent.x, -aabb.m_Extent.y, 0.0f);
outVertices[1] = aabb.m_Center + Vector3f (+aabb.m_Extent.x, -aabb.m_Extent.y, 0.0f);
outVertices[2] = aabb.m_Center + Vector3f (-aabb.m_Extent.x, +aabb.m_Extent.y, 0.0f);
outVertices[3] = aabb.m_Center + Vector3f (+aabb.m_Extent.x, +aabb.m_Extent.y, 0.0f);
}
#endif //ENABLE_SPRITES
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