void drawXFormPixelWithAlpha(const uint32_t i, const uint32_t j,
const GRect &srcRect, const GIRect &dstRect,
const GBitmap &src, const GBitmap &dst,
const uint8_t alpha,
const BlendFunc blend = blend_srcover) {
GVec3f ctxPt(static_cast<float>(dstRect.fLeft + i) + 0.5f,
static_cast<float>(dstRect.fTop + j) + 0.5f,
1.0f);
ctxPt = m_CTMInv * ctxPt;
if(ContainsPoint(srcRect, ctxPt[0], ctxPt[1])) {
uint32_t x = static_cast<uint32_t>(ctxPt[0] - srcRect.fLeft);
uint32_t y = static_cast<uint32_t>(ctxPt[1] - srcRect.fTop);
GPixel *srcRow = GetRow(src, y);
GPixel *dstRow = GetRow(dst, j+dstRect.fTop) + dstRect.fLeft;
uint32_t srcA = fixed_multiply(GPixel_GetA(srcRow[x]), alpha);
uint32_t srcR = fixed_multiply(GPixel_GetR(srcRow[x]), alpha);
uint32_t srcG = fixed_multiply(GPixel_GetG(srcRow[x]), alpha);
uint32_t srcB = fixed_multiply(GPixel_GetB(srcRow[x]), alpha);
GPixel src = GPixel_PackARGB(srcA, srcR, srcG, srcB);
dstRow[i] = blend(dstRow[i], src);
}
}
static GPixel blend_srcover(GPixel dst, GPixel src) {
uint32_t srcA = GPixel_GetA(src);
if(srcA == 255) {
return src;
}
uint32_t srcR = GPixel_GetR(src);
uint32_t srcG = GPixel_GetG(src);
uint32_t srcB = GPixel_GetB(src);
uint32_t dstA = GPixel_GetA(dst);
uint32_t dstR = GPixel_GetR(dst);
uint32_t dstG = GPixel_GetG(dst);
uint32_t dstB = GPixel_GetB(dst);
return GPixel_PackARGB(srcA + fixed_multiply(dstA, 255 - srcA),
srcR + fixed_multiply(dstR, 255 - srcA),
srcG + fixed_multiply(dstG, 255 - srcA),
srcB + fixed_multiply(dstB, 255 - srcA));
}
static void srcover_row(GPixel row[], int count, GPixel src) {
unsigned sa = GPixel_GetA(src);
unsigned sr = GPixel_GetR(src);
unsigned sg = GPixel_GetG(src);
unsigned sb = GPixel_GetB(src);
unsigned isa = 255 - sa;
for (int i = 0; i < count; ++i) {
GPixel dst = row[i];
unsigned da = GPixel_GetA(dst);
unsigned dr = GPixel_GetR(dst);
unsigned dg = GPixel_GetG(dst);
unsigned db = GPixel_GetB(dst);
unsigned a = sa + GDiv255(isa * da);
unsigned r = sr + GDiv255(isa * dr);
unsigned g = sg + GDiv255(isa * dg);
unsigned b = sb + GDiv255(isa * db);
row[i] = GPixel_PackARGB(a, r, g, b);
}
}
static void convertToPNG(const GPixel src[], int width, char dst[]) {
for (int i = 0; i < width; i++) {
GPixel c = *src++;
int a = GPixel_GetA(c);
int r = GPixel_GetR(c);
int g = GPixel_GetG(c);
int b = GPixel_GetB(c);
// PNG requires unpremultiplied, but GPixel is premultiplied
if (0 != a && 255 != a) {
r = r * 255 / a;
g = g * 255 / a;
b = b * 255 / a;
}
*dst++ = r;
*dst++ = g;
*dst++ = b;
*dst++ = a;
}
}
/**
* Fill the rectangle with color, using SRC_OVER porter-duff mode.
*
* The affected pixels are those whose centers are "contained" inside the rectangle:
* e.g. contained == center > min_edge && center <= max_edge
*
* Any area in the rectangle that is outside of the bounds of the canvas is ignored.
*/
void fillRect(const GRect& rect, const GColor& color) {
// Get dimensions of rectangle
int le = GRoundToInt(rect.left());
int to = GRoundToInt(rect.top());
int ri = GRoundToInt(rect.right());
int bo = GRoundToInt(rect.bottom());
// Fix rectangle boundaries
if (le < 0) {le = 0;}
if (to < 0) {to = 0;}
if (ri > draw.width()) {ri = draw.width();}
if (bo > draw.height()) {bo = draw.height();}
// Don't draw if rectangle is of zero size
if ((le < 0 && ri < 0) || (le > draw.width() && ri > draw.width())) {
return;
}
if ((to < 0 && bo < 0) || (to > draw.height() && bo > draw.height())) {
return;
}
if ((to == bo) || (le == ri)) {
return;
}
// If alpha value is 0, end method
if (color.fA <= 0) {
return;
}
// Prepare color to place into bitmap
GColor c = color.pinToUnit();
unsigned a = (int)(c.fA * 255.99999);
unsigned r = (int)(c.fR * c.fA * 255.99999);
unsigned g = (int)(c.fG * c.fA * 255.99999);
unsigned b = (int)(c.fB * c.fA * 255.99999);
// Fill desired pixels
GPixel* dst = draw.fPixels;
dst = (GPixel*)((char*)dst + (int)to * draw.rowBytes());
for (int y = to; y < bo; ++y) {
for (int x = le; x < ri; ++x) {
if (GPixel_GetA(*draw.getAddr(x, y)) > 0) {
// blend
float sA = c.fA + ((GPixel_GetA(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sR = (c.fR * c.fA) + ((GPixel_GetR(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sG = (c.fG * c.fA) + ((GPixel_GetG(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sB = (c.fB * c.fA) + ((GPixel_GetB(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
unsigned nA = (int)(sA * 255.99999);
unsigned nR = (int)(sR * 255.99999);
unsigned nG = (int)(sG * 255.99999);
unsigned nB = (int)(sB * 255.99999);
dst[x] = GPixel_PackARGB(nA, nR, nG, nB);
} else {
// Fill color unblended
dst[x] = GPixel_PackARGB(a, r, g, b);
}
}
dst = (GPixel*)((char*)dst + draw.rowBytes());
}
}
/**
* Fill the convex polygon with the color, following the same "containment" rule as
* rectangles.
*
* Any area in the polygon that is outside of the bounds of the canvas is ignored.
*
* If the color's alpha is < 1, blend it using SRCOVER blend mode.
*/
void fillConvexPolygon(const GPoint* po, int count, const GColor& color) {
// Consider points
// int count = # of points
// Do nothing if less than 3 points (i.e. not enough points to make a polygon)
if (count < 3) {
return;
}
// Adjust points according to CTM
// Array to hold adjusted points
GPoint* p = new GPoint[count];
// Loop to change each point
for (int i = 0; i < count; i++) {
float px;
float py;
px = (CTM[0] * po[i].x()) + (CTM[1] * po[i].y()) + (CTM[2]);
py = (CTM[3] * po[i].x()) + (CTM[4] * po[i].y()) + (CTM[5]);
// Set new x and y
p[i].set(px, py);
}
// Create edges
Edge tmpE;
std::vector<Edge> eArr;
for (int i = 0; i < count; i++) {
if (i == (count - 1)) {
if (GFloorToInt(p[i].x() + 0.5) == GFloorToInt(p[0].x() + 0.5)) {
// vertical line
tmpE.top = GFloorToInt(std::min(p[i].y(),p[0].y()) + 0.5);
tmpE.bottom = GFloorToInt(std::max(p[i].y(),p[0].y()) + 0.5);
tmpE.m = 0;
tmpE.b = 0;
tmpE.v = GFloorToInt(p[i].x() + 0.5);
tmpE.x = tmpE.v;
} else if (GFloorToInt(p[i].y() + 0.5) == GFloorToInt(p[0].y() + 0.5)) {
// horizontal line
tmpE.top = 0;
tmpE.bottom = 0;
tmpE.m = 0;
tmpE.b = 0;
tmpE.v = 0;
tmpE.x = 0;
} else {
tmpE.top = GFloorToInt(std::min(p[i].y(),p[0].y()) + 0.5);
tmpE.bottom = GFloorToInt(std::max(p[i].y(),p[0].y()) + 0.5);
tmpE.m = ((p[0].x()-p[i].x())/(p[0].y()-p[i].y()));
tmpE.b = (p[i].x()-(tmpE.m * p[i].y()));
tmpE.v = 0;
tmpE.x = GFloorToInt(std::min(p[i].x(), p[0].x()) + 0.5);
}
} else {
if (GFloorToInt(p[i].x() + 0.5) == GFloorToInt(p[i+1].x() + 0.5)) {
// vertical line
tmpE.top = GFloorToInt(std::min(p[i].y(),p[i+1].y()) + 0.5);
tmpE.bottom = GFloorToInt(std::max(p[i].y(),p[i+1].y()) + 0.5);
tmpE.m = 0;
tmpE.b = 0;
tmpE.v = GFloorToInt(p[i].x() + 0.5);
tmpE.x = tmpE.v;
} else if (GFloorToInt(p[i].y() + 0.5) == GFloorToInt(p[i+1].y() + 0.5)) {
// horizontal line
tmpE.top = 0;
tmpE.bottom = 0;
tmpE.m = 0;
tmpE.b = 0;
tmpE.v = 0;
tmpE.x = 0;
} else {
tmpE.top = GFloorToInt(std::min(p[i].y(),p[i+1].y()) + 0.5);
tmpE.bottom = GFloorToInt(std::max(p[i].y(),p[i+1].y()) + 0.5);
tmpE.m = ((p[i+1].x()-p[i].x())/(p[i+1].y()-p[i].y()));
tmpE.b = (p[i].x()-(tmpE.m * p[i].y()));
tmpE.v = 0;
tmpE.x = GFloorToInt(std::min(p[i].x(), p[i+1].x()) + 0.5);
}
}
if (tmpE.top != tmpE.bottom) {
eArr.push_back(tmpE);
}
}
// Sort edges
std::sort(eArr.begin(), eArr.end(), sortEdges);
// Prepare color to fill
GColor c = color.pinToUnit();
unsigned a = (int)(c.fA * 255.99999);
unsigned r = (int)(c.fR * c.fA * 255.99999);
unsigned g = (int)(c.fG * c.fA * 255.99999);
unsigned b = (int)(c.fB * c.fA * 255.99999);
// Find starting y pixel
int startY = eArr[0].top;
// Find ending y pixel
int endY = eArr.back().bottom;
// Fill desired pixels
// Set indexes for left and right edges at beginning
int index;
int currL;
int currR;
index = 0;
currL = index;
currR = index + 1;
index += 2;
GPixel* d = draw.fPixels;
d = (GPixel*)((char*)d + (int)startY * draw.rowBytes());
for (int y = startY; y < endY; ++y) {
for (int x = lrBound(eArr, currL, y); x < lrBound(eArr, currR, y); ++x) {
// blend if alpha isn't 255
// if pixel is out of bounds, skip pixel
if ((x >= 0) && (x < draw.width()) && (y >= 0) && (y < draw.height())) {
if (GPixel_GetA(*draw.getAddr(x, y)) > 0) {
// blend
float sA = c.fA + ((GPixel_GetA(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sR = (c.fR * c.fA) + ((GPixel_GetR(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sG = (c.fG * c.fA) + ((GPixel_GetG(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
float sB = (c.fB * c.fA) + ((GPixel_GetB(*draw.getAddr(x, y)) / 255.99999) * (1.0f - c.fA));
unsigned nA = (int)(sA * 255.99999);
unsigned nR = (int)(sR * 255.99999);
unsigned nG = (int)(sG * 255.99999);
unsigned nB = (int)(sB * 255.99999);
d[x] = GPixel_PackARGB(nA, nR, nG, nB);
} else {
d[x] = GPixel_PackARGB(a, r, g, b);
}
}
if (eArr[currL].bottom == y) {
currL = index;
index++;
}
if (eArr[currR].bottom == y) {
currR = index;
index++;
}
}
d = (GPixel*)((char*)d + draw.rowBytes());
}
}
/**
* Scale and translate the bitmap such that is fills the specific rectangle.
*
* Any area in the rectangle that is outside of the bounds of the canvas is ignored.
*
* If a given pixel in the bitmap is not opaque (e.g. GPixel_GetA() < 255) then blend it
* using SRCOVER blend mode.
*/
void fillBitmapRect(const GBitmap& src, const GRect& dst) {
// Store dimensions of dst rectangle
int left = dst.left();
int top = dst.top();
int right = dst.right();
int bottom = dst.bottom();
int rW = dst.width();
int rH = dst.height();
// Store dimensions of src bitmap
int bW = src.width();
int bH = src.height();
// Find necessary scale factor for both width and height
float sx = (float)bW/(float)rW;
float sy = (float)bH/(float)rH;
float tx = 0 - left;
float ty = 0 - top;
// Create matrix for scaling
float scale[6] =
{sx, 0, 0,
0, sy, 0};
// Create matrix for translating
float translate[6] =
{1, 0, tx,
0, 1, ty};
// Combine the matrices
float both[6] =
{sx, 0, sx*tx,
0, sy, sy*ty};
// For loop that takes each point in dst and find corresponding point in src
GPixel* d = draw.fPixels;
d = (GPixel*)((char*)d + (int)top * draw.rowBytes());
for (int y = top; y < bottom; ++y) {
for (int x = left; x < right; ++x) {
// Only map pixels that are in the bitmap
if ((x >= 0 && x < draw.width()) && (y >= 0 && y < draw.height())) {
// Find corresponding point in src bitmap
int xP;
int yP;
xP = both[0] * x + both[1] * y + both[2];
yP = both[3] * x + both[4] * y + both[5];
// Apply CTM to x and y
int nX = (CTM[0] * x) + (CTM[1] * y) + (CTM[2]);
int nY = (CTM[3] * x) + (CTM[4] * y) + (CTM[5]);
// Prepare color to fill
unsigned a = GPixel_GetA(*src.getAddr(xP, yP));
unsigned r = GPixel_GetR(*src.getAddr(xP, yP));
unsigned g = GPixel_GetG(*src.getAddr(xP, yP));
unsigned b = GPixel_GetB(*src.getAddr(xP, yP));
unsigned nA = a;
unsigned nR = r;
unsigned nG = g;
unsigned nB = b;
if (GPixel_GetA(*draw.getAddr(x, y)) > 0) {
// blend
float lA = GPixel_GetA(*src.getAddr(xP, yP)) / 255.99999;
float lR = GPixel_GetR(*src.getAddr(xP, yP)) / 255.99999;
float lG = GPixel_GetG(*src.getAddr(xP, yP)) / 255.99999;
float lB = GPixel_GetB(*src.getAddr(xP, yP)) / 255.99999;
float sA = lA + ((GPixel_GetA(*draw.getAddr(x, y)) / 255.99999) * (1.0f - lA));
float sR = lR + ((GPixel_GetR(*draw.getAddr(x, y)) / 255.99999) * (1.0f - lA));
float sG = lG + ((GPixel_GetG(*draw.getAddr(x, y)) / 255.99999) * (1.0f - lA));
float sB = lB + ((GPixel_GetB(*draw.getAddr(x, y)) / 255.99999) * (1.0f - lA));
/*
float sA = lA + ((GPixel_GetA(*draw.getAddr(nX, nY)) / 255.99999) * (1.0f - lA));
float sR = lR + ((GPixel_GetR(*draw.getAddr(nX, nY)) / 255.99999) * (1.0f - lA));
float sG = lG + ((GPixel_GetG(*draw.getAddr(nX, nY)) / 255.99999) * (1.0f - lA));
float sB = lB + ((GPixel_GetB(*draw.getAddr(nX, nY)) / 255.99999) * (1.0f - lA));
*/
nA = (int)(sA * 255.99999);
nR = (int)(sR * 255.99999);
nG = (int)(sG * 255.99999);
nB = (int)(sB * 255.99999);
d[x] = GPixel_PackARGB(nA, nR, nG, nB);
//d = (GPixel*)((char*)d + (int)nY * draw.rowBytes());
//d[nX] = GPixel_PackARGB(nA, nR, nG, nB);
//d = (GPixel*)((char*)d - (int)nY * draw.rowBytes());
} else {
d[x] = GPixel_PackARGB(a, r, g, b);
//d = (GPixel*)((char*)d + (int)nY * draw.rowBytes());
//d[nX] = GPixel_PackARGB(a, r, g, b);
//d = (GPixel*)((char*)d - (int)nY * draw.rowBytes());
}
}
}
d = (GPixel*)((char*)d + draw.rowBytes());
}
}
// This code draws a bitmap assuming that we only have translation and scale,
// which allows us to perform certain optimizations...
void drawBitmapSimple(const GBitmap &bm, const GPaint &paint) {
const GBitmap &ctxbm = GetInternalBitmap();
GRect ctxRect = GRect::MakeXYWH(0, 0, ctxbm.width(), ctxbm.height());
GRect bmRect = GRect::MakeXYWH(0, 0, bm.width(), bm.height());
GRect pixelRect = GetTransformedBoundingBox(bmRect);
GRect rect;
if(!(rect.setIntersection(ctxRect, pixelRect))) {
return;
}
// We know that since we're only doing scale and translation, that all of the pixel
// centers contained in rect are going to be drawn, so we only need to know the
// dimensions of the mapping...
GVec3f origin(0, 0, 1);
GVec3f offset(1, 1, 1);
origin = m_CTM * origin;
offset = m_CTM * offset;
float xScale = 1.0f / (offset.X() - origin.X());
float yScale = 1.0f / (offset.Y() - origin.Y());
GVec2f start = GVec2f(0, 0);
if(xScale < 0.0f) {
start.X() = pixelRect.fRight - 1.0f;
}
if(yScale < 0.0f) {
start.Y() = pixelRect.fBottom - 1.0f;
}
GIRect dstRect = rect.round();
// Construct new bitmap
int32_t offsetX = ::std::max(0, -dstRect.fLeft);
int32_t offsetY = ::std::max(0, -dstRect.fTop);
GBitmap fbm;
fbm.fWidth = bm.width();
fbm.fHeight = bm.height();
fbm.fPixels = GetRow(bm, offsetY) + offsetX;
fbm.fRowBytes = bm.fRowBytes;
BlendFunc blend = blend_srcover;
float alpha = paint.getAlpha();
if(alpha >= kOpaqueAlpha) {
for(uint32_t j = 0; j < dstRect.height(); j++) {
uint32_t srcIdxY = static_cast<uint32_t>(start.Y() + static_cast<float>(j) * yScale);
GPixel *srcPixels = GetRow(fbm, Clamp<int>(srcIdxY, 0, fbm.height()));
GPixel *dstPixels = GetRow(ctxbm, dstRect.fTop + j) + dstRect.fLeft;
for(uint32_t i = 0; i < dstRect.width(); i++) {
uint32_t srcIdxX = static_cast<uint32_t>(start.X() + static_cast<float>(i) * xScale);
dstPixels[i] = blend(dstPixels[i], srcPixels[Clamp<int>(srcIdxX, 0, fbm.width())]);
}
}
} else {
const uint32_t alphaVal = static_cast<uint32_t>((alpha * 255.0f) + 0.5f);
for(uint32_t j = 0; j < dstRect.height(); j++) {
uint32_t srcIdxY = static_cast<uint32_t>(start.Y() + static_cast<float>(j) * yScale);
GPixel *srcPixels = GetRow(fbm, srcIdxY);
GPixel *dstPixels = GetRow(ctxbm, dstRect.fTop + j) + dstRect.fLeft;
for(uint32_t i = 0; i < dstRect.width(); i++) {
uint32_t srcIdxX = static_cast<uint32_t>(start.X() + static_cast<float>(i) * xScale);
uint32_t srcA = fixed_multiply(GPixel_GetA(srcPixels[srcIdxX]), alphaVal);
uint32_t srcR = fixed_multiply(GPixel_GetR(srcPixels[srcIdxX]), alphaVal);
uint32_t srcG = fixed_multiply(GPixel_GetG(srcPixels[srcIdxX]), alphaVal);
uint32_t srcB = fixed_multiply(GPixel_GetB(srcPixels[srcIdxX]), alphaVal);
GPixel src = GPixel_PackARGB(srcA, srcR, srcG, srcB);
dstPixels[i] = blend(dstPixels[i], src);
}
}
}
}