// This code draws a bitmap using the full m_CTM transform without any thought
// to whether or not the transform has any special properties.
void drawBitmapXForm(const GBitmap &bm, const GPaint &paint) {
const GBitmap &ctxbm = GetInternalBitmap();
GRect ctxRect = GRect::MakeXYWH(0, 0, ctxbm.width(), ctxbm.height());
GIRect bmRect = GIRect::MakeXYWH(0, 0, bm.width(), bm.height());
GRect pixelRect = GetTransformedBoundingBox(bmRect);
GRect rect;
if(!(rect.setIntersection(ctxRect, pixelRect))) {
return;
}
// Rein everything back into integer land
GIRect dstRect = rect.round();
if(dstRect.isEmpty()) {
return;
}
float alpha = paint.getAlpha();
if(alpha >= kOpaqueAlpha) {
for(uint32_t j = 0; j < dstRect.height(); j++) {
for(uint32_t i = 0; i < dstRect.width(); i++) {
drawXFormPixel(i, j, dstRect, bmRect, bm, ctxbm);
}
}
} else {
const uint32_t alphaVal = static_cast<uint32_t>((alpha * 255.0f) + 0.5f);
for(uint32_t j = 0; j < dstRect.height(); j++) {
for(uint32_t i = 0; i < dstRect.width(); i++) {
drawXFormPixelWithAlpha(i, j, dstRect, bmRect, bm, ctxbm, alphaVal);
}
}
}
}
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::drawBitmap(const GBitmap& lclBmp, float x, float y, const GPaint& paint){
float alpha = paint.getAlpha();
alpha = (alpha>1)?1:((alpha<0)?0:alpha);//bound alpha by 0 and 1
uint8_t intAlpha = alpha*255 + .5;
if(intAlpha != 0){
float gTop = y, gLeft = x, gBottom = y+lclBmp.fHeight, gRight = x+lclBmp.fWidth;
mapMtx.vectorMult(&gLeft, &gTop);
mapMtx.vectorMult(&gRight, &gBottom);
ConversionMatrix invMtx;
mapMtx.getInverse(invMtx);
helper.findIntersection(&gLeft, &gRight, &gTop, &gBottom, Btmp.fHeight, Btmp.fWidth);
if((gLeft != gRight) && (gTop != gBottom)){ //if intersection surface area is zero, do nothing
float topPixValue = helper.roundToInt(gTop), bottomPixValue = helper.roundToInt(gBottom);
float gLeftStartValue = helper.roundToInt(gLeft), gRightPixValue = helper.roundToInt(gRight);
uint32_t DstColor;
uint32_t lclColor;
for (float j = topPixValue; j< bottomPixValue; j++) {
float lclYVal = j + .5;
size_t gRowsDown = j*Btmp.fRowBytes;
for (float i = gLeftStartValue; i <gRightPixValue; i++) {
float lclXVal = i + .5;
char* gAddress = (char*) Btmp.fPixels + gRowsDown + (int) i;
DstColor = *((GPixel*) gAddress);
invMtx.vectorMult(&lclXVal, &lclYVal);
lclColor = *(GPixel*) (char*) lclBmp.fPixels + floorf(lclYVal)*lclBmp.fRowBytes + floorf(lclXVal);
if (lclColor != 0) { //if there is something to blend
if(intAlpha == 1){
*((GPixel*) gAddress) = helper.blendColor(DstColor, lclColor);
}
else if( DstColor == 0 ) { //if destination alpha == 0
*((GPixel*) gAddress) = helper.packARGB(lclColor, intAlpha);
}
else{
*((GPixel*) gAddress) = helper.blendColorWithAlpha(DstColor, lclColor, intAlpha);
}
}
}
}
}
}
}
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 drawBitmap(const GBitmap &bm, float x, float y, const GPaint &paint) {
float alpha = paint.getAlpha();
if(alpha < kTransparentAlpha) {
return;
}
save();
translate(x, y);
if(CheckSkew(m_CTM)) {
drawBitmapXForm(bm, paint);
} else {
drawBitmapSimple(bm, paint);
}
restore();
}
void GContext4::drawBitmap(const GBitmap& lclBmp, float x, float y, const GPaint& paint){
float alpha = paint.getAlpha();
alpha = (alpha>1)?1:((alpha<0)?0:alpha);//bound alpha by 0 and 1
uint8_t intAlpha = alpha*255 + .5;
if(intAlpha != 0){
// first find the intersection
float gTop = y, gLeft = x, gBottom = y+lclBmp.fHeight, gRight = x+lclBmp.fWidth;
float inverseScaleX = 1;
float inverseScaleY = 1;
mapping.vectorMult(&gLeft, &gTop);
mapping.vectorMult(&gRight, &gBottom);
if(mapping.a1 != 1){
inverseScaleX = abs(1/mapping.a1); //hide divides as much as possible
}
if(mapping.b2 != 1){
inverseScaleY = abs(1/mapping.b2);
}
float lclTop = (gTop<0)?-gTop*inverseScaleY:(gTop>Btmp.fHeight)?(gTop-Btmp.fHeight*inverseScaleY):0;
float lclLeft = (gLeft<0)?-gLeft*inverseScaleX:(gLeft>Btmp.fWidth)?(gLeft-Btmp.fWidth*inverseScaleX):0;
helper.findIntersection(&gLeft, &gRight, &gTop, &gBottom, Btmp.fHeight, Btmp.fWidth); //even if directions are switched we will still move from gLeft to gRight and gTop to gBottom
if((gLeft != gRight) && (gTop != gBottom)){ //if not visible, do nothing
int topPixValue = helper.roundToInt(gTop), bottomPixValue = helper.roundToInt(gBottom);
int gLeftStartValue = helper.roundToInt(gLeft), gRightPixValue = helper.roundToInt(gRight);
int gIntervalPixelWidth = gRightPixValue - gLeftStartValue;
int gIntervalPixelHeight = bottomPixValue - topPixValue;
int lclLeftStartValue = helper.roundToInt(lclLeft);
uint32_t DstColor;
uint32_t lclColor;
char* gRow = ((char*) Btmp.fPixels + topPixValue*Btmp.fRowBytes);
char* lclRow = ((char*) lclBmp.fPixels + helper.roundToInt(lclTop)*lclBmp.fRowBytes);
char* lclStartRow = lclRow;
float lclXIncrementer = 0;
float lclYIncrementer = 0;
if (mapping.b2 > 0) { //if scale up & positive for Y
for (int j = 0; j<gIntervalPixelHeight; j++) {
if (mapping.a1 > 0) {
for (int i = 0; i < gIntervalPixelWidth; i++) {
DstColor = *((GPixel*) gRow + gLeftStartValue + i);
lclColor = *((GPixel*) lclRow + lclLeftStartValue + helper.roundToInt(lclXIncrementer));
lclXIncrementer += inverseScaleX;
if (lclColor != 0) { //if source alpha is not zero
if(intAlpha == 1){
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColor(DstColor, lclColor);
}
else if( DstColor == 0 ) { //if destination alpha == 0
*((GPixel*) gRow + gLeftStartValue + i) = helper.packARGB(lclColor, intAlpha);
}
else{
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColorWithAlpha(DstColor, lclColor, intAlpha);
}
}
}
lclXIncrementer = 0;
}
else{
for (int i = 0; i > gIntervalPixelWidth; i--) {
DstColor = *((GPixel*) gRow + gLeftStartValue + i);
lclColor = *((GPixel*) lclRow + lclLeftStartValue + helper.roundToInt(lclXIncrementer));
lclXIncrementer += inverseScaleX;
if (lclColor != 0) { //if source alpha is not zero
if(intAlpha == 1){
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColor(DstColor, lclColor);
}
else if( DstColor == 0 ) { //if destination alpha == 0
*((GPixel*) gRow + gLeftStartValue + i) = helper.packARGB(lclColor, intAlpha);
}
else{
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColorWithAlpha(DstColor, lclColor, intAlpha);
}
}
}
lclXIncrementer = 0;
}
lclYIncrementer += inverseScaleY;
gRow += Btmp.fRowBytes;
lclRow = lclStartRow + helper.roundToInt(lclYIncrementer)*lclBmp.fRowBytes;
}
}
else{
for (int j = 0; j>gIntervalPixelHeight; j--) {
if (mapping.a1 > 0) {
for (int i = 0; i < gIntervalPixelWidth; i++) {
DstColor = *((GPixel*) gRow + gLeftStartValue + i);
lclColor = *((GPixel*) lclRow + lclLeftStartValue + helper.roundToInt(lclXIncrementer));
lclXIncrementer += inverseScaleX;
if (lclColor != 0) {
if(intAlpha == 1){
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColor(DstColor, lclColor);
}
else if( DstColor == 0 ) {
*((GPixel*) gRow + gLeftStartValue + i) = helper.packARGB(lclColor, intAlpha);
}
else{
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColorWithAlpha(DstColor, lclColor, intAlpha);
}
}
}
lclXIncrementer = 0;
}
else{
for (int i = 0; i > gIntervalPixelWidth; i--) {
DstColor = *((GPixel*) gRow + gLeftStartValue + i);
lclColor = *((GPixel*) lclRow + lclLeftStartValue + helper.roundToInt(lclXIncrementer));
lclXIncrementer += inverseScaleX;
if (lclColor != 0) { //if source alpha is not zero
if(intAlpha == 1){
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColor(DstColor, lclColor);
}
else if( DstColor == 0 ) { //if destination alpha == 0
*((GPixel*) gRow + gLeftStartValue + i) = helper.packARGB(lclColor, intAlpha);
}
else{
*((GPixel*) gRow + gLeftStartValue + i) = helper.blendColorWithAlpha(DstColor, lclColor, intAlpha);
}
}
}
lclXIncrementer = 0;
}
lclYIncrementer += inverseScaleY;
gRow += Btmp.fRowBytes; //steps a row of bytes in Btmp
lclRow = lclStartRow + helper.roundToInt(lclYIncrementer)*lclBmp.fRowBytes; //steps a row of bytes in lclBmp
}
}
}
}
}
// 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);
}
}
}
}