SkLinearBitmapPipeline::SkLinearBitmapPipeline(
const SkMatrix& inverse,
SkFilterQuality filterQuality,
SkShader::TileMode xTile, SkShader::TileMode yTile,
const SkPixmap& srcPixmap) {
SkSize size = SkSize::Make(srcPixmap.width(), srcPixmap.height());
const SkImageInfo& srcImageInfo = srcPixmap.info();
// As the stages are built, the chooser function may skip a stage. For example, with the
// identity matrix, the matrix stage is skipped, and the tilerStage is the first stage.
auto placementStage = choose_pixel_placer(srcImageInfo.alphaType(), &fPixelStage);
auto samplerStage = choose_pixel_sampler(placementStage, srcPixmap, &fSampleStage);
auto tilerStage = choose_tiler(samplerStage, size, xTile, yTile, &fTileXOrBothStage,
&fTileYStage);
auto filterStage = choose_filter(tilerStage, filterQuality, &fFilterStage);
fFirstStage = choose_matrix(filterStage, inverse, &fMatrixStage);
}
SkLinearBitmapPipeline::SkLinearBitmapPipeline(
const SkMatrix& inverse,
SkFilterQuality filterQuality,
SkShader::TileMode xTile, SkShader::TileMode yTile,
SkColor paintColor,
const SkPixmap& srcPixmap)
{
SkISize dimensions = srcPixmap.info().dimensions();
const SkImageInfo& srcImageInfo = srcPixmap.info();
SkMatrix adjustedInverse = inverse;
if (filterQuality == kNone_SkFilterQuality) {
if (inverse.getScaleX() >= 0.0f) {
adjustedInverse.setTranslateX(
nextafterf(inverse.getTranslateX(), std::floor(inverse.getTranslateX())));
}
if (inverse.getScaleY() >= 0.0f) {
adjustedInverse.setTranslateY(
nextafterf(inverse.getTranslateY(), std::floor(inverse.getTranslateY())));
}
}
SkScalar dx = adjustedInverse.getScaleX();
// If it is an index 8 color type, the sampler converts to unpremul for better fidelity.
SkAlphaType alphaType = srcImageInfo.alphaType();
if (srcPixmap.colorType() == kIndex_8_SkColorType) {
alphaType = kUnpremul_SkAlphaType;
}
float postAlpha = SkColorGetA(paintColor) * (1.0f / 255.0f);
// As the stages are built, the chooser function may skip a stage. For example, with the
// identity matrix, the matrix stage is skipped, and the tilerStage is the first stage.
auto blenderStage = choose_blender_for_shading(alphaType, postAlpha, &fBlenderStage);
auto samplerStage = choose_pixel_sampler(
blenderStage, filterQuality, xTile, yTile,
srcPixmap, paintColor, &fSampleStage, &fAccessor);
auto tilerStage = choose_tiler(samplerStage, dimensions, xTile, yTile,
filterQuality, dx, &fTileStage);
fFirstStage = choose_matrix(tilerStage, adjustedInverse, &fMatrixStage);
fLastStage = blenderStage;
}