void drawRect(const GRect &rect, const GPaint &p) {
const GBitmap &ctxbm = GetInternalBitmap();
GRect ctxRect = GRect::MakeXYWH(0, 0, ctxbm.width(), ctxbm.height());
GRect pixelRect = GetTransformedBoundingBox(rect);
if(pixelRect.isEmpty()) {
return;
}
GRect trRect;
if(!(trRect.setIntersection(ctxRect, pixelRect))) {
return;
}
// Rein everything back into integer land
GIRect dstRect = trRect.round();
if(dstRect.isEmpty()) {
return;
}
if(!(CheckSkew(m_CTM))) {
fillIRect(dstRect, p.getColor(), eBlendOp_SrcOver);
return;
}
GPixel clearValue = ColorToPixel(p.getColor());
// If the alpha value is above this value, then it will round to
// an opaque pixel during quantization.
const float kOpaqueAlpha = (254.5f / 255.0f);
float alpha = p.getAlpha();
// Blend func is currently just srcover
BlendFunc blend = blend_srcover;
for(uint32_t j = 0; j < dstRect.height(); j++) {
for(uint32_t i = 0; i < dstRect.width(); i++) {
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(rect, ctxPt[0], ctxPt[1])) {
uint32_t x = static_cast<uint32_t>(ctxPt[0] - rect.fLeft);
uint32_t y = static_cast<uint32_t>(ctxPt[1] - rect.fTop);
GPixel *dstRow = GetRow(ctxbm, j+dstRect.fTop) + dstRect.fLeft;
dstRow[i] = blend(dstRow[i], clearValue);
}
}
}
}
void GContext4::drawRect(const GRect& rect, const GPaint& bucket){
if((int)(bucket.getAlpha()*255 + .5) > 0){ //only do something if the alpha is greater than zero
const GColor& color = bucket.getColor();
if(helper.isLegalColor(color)){
if(!rect.isEmpty()){
float rTop=rect.fTop,rBottom=rect.fBottom,rLeft=rect.fLeft,rRight=rect.fRight;
mapping.vectorMult(&rLeft, &rTop);
mapping.vectorMult(&rRight, &rBottom);
if(rLeft>rRight){
rLeft += rRight;
rRight = rLeft - rRight;
rLeft = rLeft - rRight;
}
if (rTop > rBottom){
rTop += rBottom;
rBottom = rTop - rBottom;
rTop = rTop - rBottom;
}
int left = helper.roundToInt(rLeft);
int right = helper.roundToInt(rRight);
int top = helper.roundToInt(rTop);
int bottom = helper.roundToInt(rBottom);
helper.findIntersection(&left, &right, &top, &bottom, Btmp.fHeight, Btmp.fWidth);
uint32_t storedResult = 0x01;
uint32_t storedDestination = 0x01;
uint32_t DstColor;
uint32_t rectColor = helper.packARGB(color);
char* row = ((char*) Btmp.fPixels) + top*Btmp.fRowBytes;
for(int j = top; j<bottom; j++){
for(int i=left ; i<right; i++){
DstColor = *((GPixel*) row + i);
if(storedDestination == DstColor){ //if we have the value already, don't do the math
*((GPixel*) row + i) = storedResult;
}
else{
storedDestination = DstColor;
storedResult = helper.blendColor(DstColor, rectColor);
*((GPixel*) row + i) = storedResult; //blends the two colors
}
}
row += Btmp.fRowBytes;
}
}
}
}
}
void WalkEdges(const GEdge e1, const GEdge e2, const GPaint &paint) {
const GBitmap &bm = GetInternalBitmap();
int h = bm.fHeight;
int w = bm.fWidth;
GASSERT(e1.p1.y() == e2.p1.y());
int startY = Clamp(static_cast<int>(e1.p1.y() + 0.5f), 0, h-1);
GASSERT(e1.p2.y() == e2.p2.y());
int endY = Clamp(static_cast<int>(e1.p2.y() + 0.5f), 0, h-1);
if(endY == startY) {
return;
}
GASSERT(endY > startY);
// Initialize to NAN
float m1 = 0.0f/0.0f, b1;
float m2 = 0.0f/0.0f, b2;
bool vert1 = e1.ComputeLine(m1, b1);
bool vert2 = e2.ComputeLine(m2, b2);
if(m1 == 0 || m2 == 0) {
return;
}
// Collinear?
if(vert2 && vert1 && e1.p1.x() == e2.p1.x()) {
return;
} else if(m1 == m2 && b1 == b2) {
return;
}
float stepX1 = vert1? 0 : 1/m1;
float stepX2 = vert2? 0 : 1/m2;
GPoint p1, p2;
float sY = static_cast<float>(startY) + 0.5f;
if(vert1) {
p1.set(e1.p1.x(), sY);
} else {
p1.set((sY - b1) / m1, sY);
}
if(vert2) {
p2.set(e2.p1.x(), sY);
} else {
p2.set((sY - b2) / m2, sY);
}
// Make sure that p1 is always less than p2 to avoid
// doing a min/max in the inner loop
if(p1.x() > p2.x()) {
std::swap(p1, p2);
std::swap(stepX1, stepX2);
}
GPixel color = ColorToPixel(paint.getColor());
BlendFunc blend = GetBlendFunc(eBlendOp_SrcOver);
uint32_t nSteps = endY - startY;
for(uint32_t i = 0; i < nSteps; i++) {
// Since we haven't implemented clipping yet, take care
// not to go beyond our bounds...
const int x1 = Clamp<int>(p1.fX + 0.5f, 0, w-1);
const int x2 = Clamp<int>(p2.fX + 0.5f, 0, w-1);
GPixel *row = GetRow(bm, startY + i);
for(int x = x1; x < x2; x++) {
row[x] = blend(row[x], color);
}
p1.fX += stepX1;
p2.fX += stepX2;
}
}