/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkArenaAlloc.h"
#include "SkBitmapController.h"
#include "SkBitmapProcShader.h"
#include "SkBitmapProvider.h"
#include "SkColorTable.h"
#include "SkEmptyShader.h"
#include "SkImage_Base.h"
#include "SkImageShader.h"
#include "SkImageShaderContext.h"
#include "SkPM4fPriv.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
SkImageShader::SkImageShader(sk_sp<SkImage> img, TileMode tmx, TileMode tmy, const SkMatrix* matrix)
: INHERITED(matrix)
, fImage(std::move(img))
, fTileModeX(tmx)
, fTileModeY(tmy)
{}
sk_sp<SkFlattenable> SkImageShader::CreateProc(SkReadBuffer& buffer) {
const TileMode tx = (TileMode)buffer.readUInt();
const TileMode ty = (TileMode)buffer.readUInt();
SkMatrix matrix;
buffer.readMatrix(&matrix);
sk_sp<SkImage> img = buffer.readImage();
if (!img) {
return nullptr;
}
return SkImageShader::Make(std::move(img), tx, ty, &matrix);
}
void SkImageShader::flatten(SkWriteBuffer& buffer) const {
buffer.writeUInt(fTileModeX);
buffer.writeUInt(fTileModeY);
buffer.writeMatrix(this->getLocalMatrix());
buffer.writeImage(fImage.get());
}
bool SkImageShader::isOpaque() const {
return fImage->isOpaque();
}
SkShader::Context* SkImageShader::onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const {
return SkBitmapProcLegacyShader::MakeContext(*this, fTileModeX, fTileModeY,
SkBitmapProvider(fImage.get(), rec.fDstColorSpace),
rec, alloc);
}
SkImage* SkImageShader::onIsAImage(SkMatrix* texM, TileMode xy[]) const {
if (texM) {
*texM = this->getLocalMatrix();
}
if (xy) {
xy[0] = (TileMode)fTileModeX;
xy[1] = (TileMode)fTileModeY;
}
return const_cast<SkImage*>(fImage.get());
}
#ifdef SK_SUPPORT_LEGACY_SHADER_ISABITMAP
bool SkImageShader::onIsABitmap(SkBitmap* texture, SkMatrix* texM, TileMode xy[]) const {
const SkBitmap* bm = as_IB(fImage)->onPeekBitmap();
if (!bm) {
return false;
}
if (texture) {
*texture = *bm;
}
if (texM) {
*texM = this->getLocalMatrix();
}
if (xy) {
xy[0] = (TileMode)fTileModeX;
xy[1] = (TileMode)fTileModeY;
}
return true;
}
#endif
static bool bitmap_is_too_big(int w, int h) {
// SkBitmapProcShader stores bitmap coordinates in a 16bit buffer, as it
// communicates between its matrix-proc and its sampler-proc. Until we can
// widen that, we have to reject bitmaps that are larger.
//
static const int kMaxSize = 65535;
return w > kMaxSize || h > kMaxSize;
}
sk_sp<SkShader> SkImageShader::Make(sk_sp<SkImage> image, TileMode tx, TileMode ty,
const SkMatrix* localMatrix) {
if (!image || bitmap_is_too_big(image->width(), image->height())) {
return sk_make_sp<SkEmptyShader>();
} else {
return sk_make_sp<SkImageShader>(image, tx, ty, localMatrix);
}
}
#ifndef SK_IGNORE_TO_STRING
void SkImageShader::toString(SkString* str) const {
const char* gTileModeName[SkShader::kTileModeCount] = {
"clamp", "repeat", "mirror"
};
str->appendf("ImageShader: ((%s %s) ", gTileModeName[fTileModeX], gTileModeName[fTileModeY]);
fImage->toString(str);
this->INHERITED::toString(str);
str->append(")");
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "SkGr.h"
#include "GrContext.h"
#include "effects/GrSimpleTextureEffect.h"
#include "effects/GrBicubicEffect.h"
#include "effects/GrSimpleTextureEffect.h"
sk_sp<GrFragmentProcessor> SkImageShader::asFragmentProcessor(const AsFPArgs& args) const {
SkMatrix lmInverse;
if (!this->getLocalMatrix().invert(&lmInverse)) {
return nullptr;
}
if (args.fLocalMatrix) {
SkMatrix inv;
if (!args.fLocalMatrix->invert(&inv)) {
return nullptr;
}
lmInverse.postConcat(inv);
}
SkShader::TileMode tm[] = { fTileModeX, fTileModeY };
// Must set wrap and filter on the sampler before requesting a texture. In two places below
// we check the matrix scale factors to determine how to interpret the filter quality setting.
// This completely ignores the complexity of the drawVertices case where explicit local coords
// are provided by the caller.
bool doBicubic;
GrSamplerParams::FilterMode textureFilterMode =
GrSkFilterQualityToGrFilterMode(args.fFilterQuality, *args.fViewMatrix, this->getLocalMatrix(),
&doBicubic);
GrSamplerParams params(tm, textureFilterMode);
sk_sp<SkColorSpace> texColorSpace;
SkScalar scaleAdjust[2] = { 1.0f, 1.0f };
sk_sp<GrTextureProxy> proxy(as_IB(fImage)->asTextureProxyRef(args.fContext, params,
args.fDstColorSpace,
&texColorSpace, scaleAdjust));
if (!proxy) {
return nullptr;
}
bool isAlphaOnly = GrPixelConfigIsAlphaOnly(proxy->config());
lmInverse.postScale(scaleAdjust[0], scaleAdjust[1]);
sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(texColorSpace.get(),
args.fDstColorSpace);
sk_sp<GrFragmentProcessor> inner;
if (doBicubic) {
inner = GrBicubicEffect::Make(args.fContext->resourceProvider(), std::move(proxy),
std::move(colorSpaceXform), lmInverse, tm);
} else {
inner = GrSimpleTextureEffect::Make(args.fContext->resourceProvider(), std::move(proxy),
std::move(colorSpaceXform), lmInverse, params);
}
if (isAlphaOnly) {
return inner;
}
return sk_sp<GrFragmentProcessor>(GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)));
}
#endif
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkImagePriv.h"
sk_sp<SkShader> SkMakeBitmapShader(const SkBitmap& src, SkShader::TileMode tmx,
SkShader::TileMode tmy, const SkMatrix* localMatrix,
SkCopyPixelsMode cpm) {
return SkImageShader::Make(SkMakeImageFromRasterBitmap(src, cpm),
tmx, tmy, localMatrix);
}
static sk_sp<SkFlattenable> SkBitmapProcShader_CreateProc(SkReadBuffer& buffer) {
SkMatrix lm;
buffer.readMatrix(&lm);
sk_sp<SkImage> image = buffer.readBitmapAsImage();
SkShader::TileMode mx = (SkShader::TileMode)buffer.readUInt();
SkShader::TileMode my = (SkShader::TileMode)buffer.readUInt();
return image ? image->makeShader(mx, my, &lm) : nullptr;
}
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkShader)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkImageShader)
SkFlattenable::Register("SkBitmapProcShader", SkBitmapProcShader_CreateProc, kSkShader_Type);
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
bool SkImageShader::onAppendStages(SkRasterPipeline* p, SkColorSpace* dst, SkArenaAlloc* scratch,
const SkMatrix& ctm, const SkPaint& paint,
const SkMatrix* localM) const {
auto matrix = SkMatrix::Concat(ctm, this->getLocalMatrix());
if (localM) {
matrix.preConcat(*localM);
}
if (!matrix.invert(&matrix)) {
return false;
}
auto quality = paint.getFilterQuality();
SkBitmapProvider provider(fImage.get(), dst);
SkDefaultBitmapController controller(SkDefaultBitmapController::CanShadeHQ::kYes);
std::unique_ptr<SkBitmapController::State> state {
controller.requestBitmap(provider, matrix, quality)
};
if (!state) {
return false;
}
const SkPixmap& pm = state->pixmap();
matrix = state->invMatrix();
quality = state->quality();
auto info = pm.info();
// When the matrix is just an integer translate, bilerp == nearest neighbor.
if (quality == kLow_SkFilterQuality &&
matrix.getType() <= SkMatrix::kTranslate_Mask &&
matrix.getTranslateX() == (int)matrix.getTranslateX() &&
matrix.getTranslateY() == (int)matrix.getTranslateY()) {
quality = kNone_SkFilterQuality;
}
// See skia:4649 and the GM image_scale_aligned.
if (quality == kNone_SkFilterQuality) {
if (matrix.getScaleX() >= 0) {
matrix.setTranslateX(nextafterf(matrix.getTranslateX(),
floorf(matrix.getTranslateX())));
}
if (matrix.getScaleY() >= 0) {
matrix.setTranslateY(nextafterf(matrix.getTranslateY(),
floorf(matrix.getTranslateY())));
}
}
auto ctx = scratch->make<SkImageShaderContext>();
ctx->state = std::move(state); // Extend lifetime to match the pipeline's.
ctx->pixels = pm.addr();
ctx->ctable = pm.ctable();
ctx->color4f = SkColor4f_from_SkColor(paint.getColor(), dst);
ctx->stride = pm.rowBytesAsPixels();
ctx->width = (float)pm.width();
ctx->height = (float)pm.height();
if (matrix.asAffine(ctx->matrix)) {
p->append(SkRasterPipeline::matrix_2x3, ctx->matrix);
} else {
matrix.get9(ctx->matrix);
p->append(SkRasterPipeline::matrix_perspective, ctx->matrix);
}
auto append_tiling_and_gather = [&] {
switch (fTileModeX) {
case kClamp_TileMode: p->append(SkRasterPipeline::clamp_x, &ctx->width); break;
case kMirror_TileMode: p->append(SkRasterPipeline::mirror_x, &ctx->width); break;
case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_x, &ctx->width); break;
}
switch (fTileModeY) {
case kClamp_TileMode: p->append(SkRasterPipeline::clamp_y, &ctx->height); break;
case kMirror_TileMode: p->append(SkRasterPipeline::mirror_y, &ctx->height); break;
case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_y, &ctx->height); break;
}
switch (info.colorType()) {
case kAlpha_8_SkColorType: p->append(SkRasterPipeline::gather_a8, ctx); break;
case kIndex_8_SkColorType: p->append(SkRasterPipeline::gather_i8, ctx); break;
case kGray_8_SkColorType: p->append(SkRasterPipeline::gather_g8, ctx); break;
case kRGB_565_SkColorType: p->append(SkRasterPipeline::gather_565, ctx); break;
case kARGB_4444_SkColorType: p->append(SkRasterPipeline::gather_4444, ctx); break;
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType: p->append(SkRasterPipeline::gather_8888, ctx); break;
case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::gather_f16, ctx); break;
default: SkASSERT(false);
}
if (info.gammaCloseToSRGB() && dst != nullptr) {
p->append_from_srgb(info.alphaType());
}
};
auto sample = [&](SkRasterPipeline::StockStage setup_x,
SkRasterPipeline::StockStage setup_y) {
p->append(setup_x, ctx);
p->append(setup_y, ctx);
append_tiling_and_gather();
p->append(SkRasterPipeline::accumulate, ctx);
};
if (quality == kNone_SkFilterQuality) {
append_tiling_and_gather();
} else if (quality == kLow_SkFilterQuality) {
p->append(SkRasterPipeline::save_xy, ctx);
sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_ny);
sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_ny);
sample(SkRasterPipeline::bilinear_nx, SkRasterPipeline::bilinear_py);
sample(SkRasterPipeline::bilinear_px, SkRasterPipeline::bilinear_py);
p->append(SkRasterPipeline::move_dst_src);
} else {
p->append(SkRasterPipeline::save_xy, ctx);
sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n3y);
sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n3y);
sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n3y);
sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n3y);
sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_n1y);
sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_n1y);
sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_n1y);
sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_n1y);
sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p1y);
sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p1y);
sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p1y);
sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p1y);
sample(SkRasterPipeline::bicubic_n3x, SkRasterPipeline::bicubic_p3y);
sample(SkRasterPipeline::bicubic_n1x, SkRasterPipeline::bicubic_p3y);
sample(SkRasterPipeline::bicubic_p1x, SkRasterPipeline::bicubic_p3y);
sample(SkRasterPipeline::bicubic_p3x, SkRasterPipeline::bicubic_p3y);
p->append(SkRasterPipeline::move_dst_src);
}
auto effective_color_type = [](SkColorType ct) {
return ct == kIndex_8_SkColorType ? kN32_SkColorType : ct;
};
if (effective_color_type(info.colorType()) == kBGRA_8888_SkColorType) {
p->append(SkRasterPipeline::swap_rb);
}
if (info.colorType() == kAlpha_8_SkColorType) {
p->append(SkRasterPipeline::set_rgb, &ctx->color4f);
}
if (info.colorType() == kAlpha_8_SkColorType || info.alphaType() == kUnpremul_SkAlphaType) {
p->append(SkRasterPipeline::premul);
}
if (quality > kLow_SkFilterQuality) {
// Bicubic filtering naturally produces out of range values on both sides.
p->append(SkRasterPipeline::clamp_0);
p->append(SkRasterPipeline::clamp_a);
}
return append_gamut_transform(p, scratch, info.colorSpace(), dst);
}