blob: c8a09ff7c73577ba83598ace22b80b9848b5ca95 [file] [log] [blame]
/*
* 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 "include/core/SkPixmap.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkData.h"
#include "include/core/SkSurface.h"
#include "include/core/SkUnPreMultiply.h"
#include "include/private/SkColorData.h"
#include "include/private/SkHalf.h"
#include "include/private/SkImageInfoPriv.h"
#include "include/private/SkNx.h"
#include "include/private/SkTemplates.h"
#include "include/private/SkTo.h"
#include "src/core/SkConvertPixels.h"
#include "src/core/SkDraw.h"
#include "src/core/SkMask.h"
#include "src/core/SkPixmapPriv.h"
#include "src/core/SkRasterClip.h"
#include "src/core/SkUtils.h"
#include "src/image/SkReadPixelsRec.h"
#include "src/shaders/SkImageShader.h"
#include <utility>
/////////////////////////////////////////////////////////////////////////////////////////////////
void SkPixmap::reset() {
fPixels = nullptr;
fRowBytes = 0;
fInfo = SkImageInfo::MakeUnknown();
}
void SkPixmap::reset(const SkImageInfo& info, const void* addr, size_t rowBytes) {
if (addr) {
SkASSERT(info.validRowBytes(rowBytes));
}
fPixels = addr;
fRowBytes = rowBytes;
fInfo = info;
}
bool SkPixmap::reset(const SkMask& src) {
if (SkMask::kA8_Format == src.fFormat) {
this->reset(SkImageInfo::MakeA8(src.fBounds.width(), src.fBounds.height()),
src.fImage, src.fRowBytes);
return true;
}
this->reset();
return false;
}
void SkPixmap::setColorSpace(sk_sp<SkColorSpace> cs) {
fInfo = fInfo.makeColorSpace(std::move(cs));
}
bool SkPixmap::extractSubset(SkPixmap* result, const SkIRect& subset) const {
SkIRect srcRect, r;
srcRect.setWH(this->width(), this->height());
if (!r.intersect(srcRect, subset)) {
return false; // r is empty (i.e. no intersection)
}
// If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have
// exited above.
SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width()));
SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height()));
const void* pixels = nullptr;
if (fPixels) {
const size_t bpp = fInfo.bytesPerPixel();
pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp;
}
result->reset(fInfo.makeDimensions(r.size()), pixels, fRowBytes);
return true;
}
// This is the same as SkPixmap::addr(x,y), but this version gets inlined, while the public
// method does not. Perhaps we could bloat it so it can be inlined, but that would grow code-size
// everywhere, instead of just here (on behalf of getAlphaf()).
static const void* fast_getaddr(const SkPixmap& pm, int x, int y) {
x <<= SkColorTypeShiftPerPixel(pm.colorType());
return static_cast<const char*>(pm.addr()) + y * pm.rowBytes() + x;
}
float SkPixmap::getAlphaf(int x, int y) const {
SkASSERT(this->addr());
SkASSERT((unsigned)x < (unsigned)this->width());
SkASSERT((unsigned)y < (unsigned)this->height());
float value = 0;
const void* srcPtr = fast_getaddr(*this, x, y);
switch (this->colorType()) {
case kUnknown_SkColorType:
return 0;
case kGray_8_SkColorType:
case kR8G8_unorm_SkColorType:
case kR16G16_unorm_SkColorType:
case kR16G16_float_SkColorType:
case kRGB_565_SkColorType:
case kRGB_888x_SkColorType:
case kRGB_101010x_SkColorType:
return 1;
case kAlpha_8_SkColorType:
value = static_cast<const uint8_t*>(srcPtr)[0] * (1.0f/255);
break;
case kA16_unorm_SkColorType:
value = static_cast<const uint16_t*>(srcPtr)[0] * (1.0f/65535);
break;
case kA16_float_SkColorType: {
SkHalf half = static_cast<const SkHalf*>(srcPtr)[0];
value = SkHalfToFloat(half);
break;
}
case kARGB_4444_SkColorType: {
uint16_t u16 = static_cast<const uint16_t*>(srcPtr)[0];
value = SkGetPackedA4444(u16) * (1.0f/15);
break;
}
case kRGBA_8888_SkColorType:
case kBGRA_8888_SkColorType:
value = static_cast<const uint8_t*>(srcPtr)[3] * (1.0f/255);
break;
case kRGBA_1010102_SkColorType: {
uint32_t u32 = static_cast<const uint32_t*>(srcPtr)[0];
value = (u32 >> 30) * (1.0f/3);
break;
}
case kR16G16B16A16_unorm_SkColorType: {
uint64_t u64 = static_cast<const uint64_t*>(srcPtr)[0];
value = (u64 >> 48) * (1.0f/65535);
break;
}
case kRGBA_F16Norm_SkColorType:
case kRGBA_F16_SkColorType: {
uint64_t px;
memcpy(&px, srcPtr, sizeof(px));
value = SkHalfToFloat_finite_ftz(px)[3];
break;
}
case kRGBA_F32_SkColorType:
value = static_cast<const float*>(srcPtr)[3];
break;
}
return value;
}
bool SkPixmap::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
int x, int y) const {
if (!SkImageInfoValidConversion(dstInfo, fInfo)) {
return false;
}
SkReadPixelsRec rec(dstInfo, dstPixels, dstRB, x, y);
if (!rec.trim(fInfo.width(), fInfo.height())) {
return false;
}
const void* srcPixels = this->addr(rec.fX, rec.fY);
const SkImageInfo srcInfo = fInfo.makeDimensions(rec.fInfo.dimensions());
SkConvertPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, srcInfo, srcPixels, this->rowBytes());
return true;
}
bool SkPixmap::erase(SkColor color, const SkIRect& subset) const {
return this->erase(SkColor4f::FromColor(color), &subset);
}
bool SkPixmap::erase(const SkColor4f& color, const SkIRect* subset) const {
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColor4f(color, this->colorSpace());
SkIRect clip = this->bounds();
if (subset && !clip.intersect(*subset)) {
return false;
}
SkRasterClip rc{clip};
SkDraw draw;
draw.fDst = *this;
draw.fMatrix = &SkMatrix::I();
draw.fRC = &rc;
draw.drawPaint(paint);
return true;
}
bool SkPixmap::scalePixels(const SkPixmap& actualDst, SkFilterQuality quality) const {
// We may need to tweak how we interpret these just a little below, so we make copies.
SkPixmap src = *this,
dst = actualDst;
// Can't do anthing with empty src or dst
if (src.width() <= 0 || src.height() <= 0 ||
dst.width() <= 0 || dst.height() <= 0) {
return false;
}
// no scaling involved?
if (src.width() == dst.width() && src.height() == dst.height()) {
return src.readPixels(dst);
}
// If src and dst are both unpremul, we'll fake the source out to appear as if premul,
// and mark the destination as opaque. This odd combination allows us to scale unpremul
// pixels without ever premultiplying them (perhaps losing information in the color channels).
// This is an idiosyncratic feature of scalePixels(), and is tested by scalepixels_unpremul GM.
bool clampAsIfUnpremul = false;
if (src.alphaType() == kUnpremul_SkAlphaType &&
dst.alphaType() == kUnpremul_SkAlphaType) {
src.reset(src.info().makeAlphaType(kPremul_SkAlphaType), src.addr(), src.rowBytes());
dst.reset(dst.info().makeAlphaType(kOpaque_SkAlphaType), dst.addr(), dst.rowBytes());
// We'll need to tell the image shader to clamp to [0,1] instead of the
// usual [0,a] when using a bicubic scaling (kHigh_SkFilterQuality).
clampAsIfUnpremul = true;
}
SkBitmap bitmap;
if (!bitmap.installPixels(src)) {
return false;
}
bitmap.setImmutable(); // Don't copy when we create an image.
bitmap.setIsVolatile(true); // Disable any caching.
SkMatrix scale = SkMatrix::MakeRectToRect(SkRect::Make(src.bounds()),
SkRect::Make(dst.bounds()),
SkMatrix::kFill_ScaleToFit);
// We'll create a shader to do this draw so we have control over the bicubic clamp.
sk_sp<SkShader> shader = SkImageShader::Make(SkImage::MakeFromBitmap(bitmap),
SkTileMode::kClamp,
SkTileMode::kClamp,
&scale,
clampAsIfUnpremul);
sk_sp<SkSurface> surface = SkSurface::MakeRasterDirect(dst.info(),
dst.writable_addr(),
dst.rowBytes());
if (!shader || !surface) {
return false;
}
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setFilterQuality(quality);
paint.setShader(std::move(shader));
surface->getCanvas()->drawPaint(paint);
return true;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
SkColor SkPixmap::getColor(int x, int y) const {
SkASSERT(this->addr());
SkASSERT((unsigned)x < (unsigned)this->width());
SkASSERT((unsigned)y < (unsigned)this->height());
const bool needsUnpremul = (kPremul_SkAlphaType == fInfo.alphaType());
auto toColor = [needsUnpremul](uint32_t maybePremulColor) {
return needsUnpremul ? SkUnPreMultiply::PMColorToColor(maybePremulColor)
: SkSwizzle_BGRA_to_PMColor(maybePremulColor);
};
switch (this->colorType()) {
case kGray_8_SkColorType: {
uint8_t value = *this->addr8(x, y);
return SkColorSetRGB(value, value, value);
}
case kAlpha_8_SkColorType: {
return SkColorSetA(0, *this->addr8(x, y));
}
case kA16_unorm_SkColorType: {
uint16_t value = *this->addr16(x, y);
return SkColorSetA(0, value * (255 / 65535.0f));
}
case kA16_float_SkColorType: {
SkHalf value = *this->addr16(x, y);
return SkColorSetA(0, 255 * SkHalfToFloat(value));
}
case kRGB_565_SkColorType: {
return SkPixel16ToColor(*this->addr16(x, y));
}
case kARGB_4444_SkColorType: {
uint16_t value = *this->addr16(x, y);
SkPMColor c = SkPixel4444ToPixel32(value);
return toColor(c);
}
case kR8G8_unorm_SkColorType: {
uint16_t value = *this->addr16(x, y);
return (uint32_t)( ((value >> 0) & 0xff) ) << 16
| (uint32_t)( ((value >> 8) & 0xff) ) << 8
| 0xff000000;
}
case kR16G16_unorm_SkColorType: {
uint32_t value = *this->addr32(x, y);
return (uint32_t)( ((value >> 0) & 0xffff) * (255/65535.0f) ) << 16
| (uint32_t)( ((value >> 16) & 0xffff) * (255/65535.0f) ) << 8
| 0xff000000;
}
case kR16G16_float_SkColorType: {
uint32_t value = *this->addr32(x, y);
uint32_t r = 255 * SkHalfToFloat((value >> 0) & 0xffff);
uint32_t g = 255 * SkHalfToFloat((value >> 16) & 0xffff);
return (r << 16) | (g << 8) | 0xff000000;
}
case kRGB_888x_SkColorType: {
uint32_t value = *this->addr32(x, y);
return SkSwizzle_RB(value | 0xff000000);
}
case kBGRA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_BGRA_to_PMColor(value);
return toColor(c);
}
case kRGBA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_RGBA_to_PMColor(value);
return toColor(c);
}
case kRGB_101010x_SkColorType: {
uint32_t value = *this->addr32(x, y);
// Convert 10-bit rgb to 8-bit bgr, and mask in 0xff alpha at the top.
return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 16
| (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8
| (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 0
| 0xff000000;
}
case kRGBA_1010102_SkColorType: {
uint32_t value = *this->addr32(x, y);
float r = ((value >> 0) & 0x3ff) * (1/1023.0f),
g = ((value >> 10) & 0x3ff) * (1/1023.0f),
b = ((value >> 20) & 0x3ff) * (1/1023.0f),
a = ((value >> 30) & 0x3 ) * (1/ 3.0f);
if (a != 0 && needsUnpremul) {
r = SkTPin(r/a, 0.0f, 1.0f);
g = SkTPin(g/a, 0.0f, 1.0f);
b = SkTPin(b/a, 0.0f, 1.0f);
}
return (uint32_t)( r * 255.0f ) << 16
| (uint32_t)( g * 255.0f ) << 8
| (uint32_t)( b * 255.0f ) << 0
| (uint32_t)( a * 255.0f ) << 24;
}
case kR16G16B16A16_unorm_SkColorType: {
uint64_t value = *this->addr64(x, y);
float r = ((value ) & 0xffff) * (1/65535.0f),
g = ((value >> 16) & 0xffff) * (1/65535.0f),
b = ((value >> 32) & 0xffff) * (1/65535.0f),
a = ((value >> 48) & 0xffff) * (1/65535.0f);
if (a != 0 && needsUnpremul) {
r *= (1.0f/a);
g *= (1.0f/a);
b *= (1.0f/a);
}
return (uint32_t)( r * 255.0f ) << 16
| (uint32_t)( g * 255.0f ) << 8
| (uint32_t)( b * 255.0f ) << 0
| (uint32_t)( a * 255.0f ) << 24;
}
case kRGBA_F16Norm_SkColorType:
case kRGBA_F16_SkColorType: {
const uint64_t* addr =
(const uint64_t*)fPixels + y * (fRowBytes >> 3) + x;
Sk4f p4 = SkHalfToFloat_finite_ftz(*addr);
if (p4[3] && needsUnpremul) {
float inva = 1 / p4[3];
p4 = p4 * Sk4f(inva, inva, inva, 1);
}
SkColor c;
SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
// p4 is RGBA, but we want BGRA, so we need to swap next
return SkSwizzle_RB(c);
}
case kRGBA_F32_SkColorType: {
const float* rgba =
(const float*)fPixels + 4*y*(fRowBytes >> 4) + 4*x;
Sk4f p4 = Sk4f::Load(rgba);
// From here on, just like F16:
if (p4[3] && needsUnpremul) {
float inva = 1 / p4[3];
p4 = p4 * Sk4f(inva, inva, inva, 1);
}
SkColor c;
SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
// p4 is RGBA, but we want BGRA, so we need to swap next
return SkSwizzle_RB(c);
}
default:
SkDEBUGFAIL("");
return SkColorSetARGB(0, 0, 0, 0);
}
}
bool SkPixmap::computeIsOpaque() const {
const int height = this->height();
const int width = this->width();
switch (this->colorType()) {
case kAlpha_8_SkColorType: {
unsigned a = 0xFF;
for (int y = 0; y < height; ++y) {
const uint8_t* row = this->addr8(0, y);
for (int x = 0; x < width; ++x) {
a &= row[x];
}
if (0xFF != a) {
return false;
}
}
return true;
}
case kA16_unorm_SkColorType: {
unsigned a = 0xFFFF;
for (int y = 0; y < height; ++y) {
const uint16_t* row = this->addr16(0, y);
for (int x = 0; x < width; ++x) {
a &= row[x];
}
if (0xFFFF != a) {
return false;
}
}
return true;
}
case kA16_float_SkColorType: {
for (int y = 0; y < height; ++y) {
const SkHalf* row = this->addr16(0, y);
for (int x = 0; x < width; ++x) {
if (row[x] < SK_Half1) {
return false;
}
}
}
return true;
}
case kRGB_565_SkColorType:
case kGray_8_SkColorType:
case kR8G8_unorm_SkColorType:
case kR16G16_unorm_SkColorType:
case kR16G16_float_SkColorType:
case kRGB_888x_SkColorType:
case kRGB_101010x_SkColorType:
return true;
break;
case kARGB_4444_SkColorType: {
unsigned c = 0xFFFF;
for (int y = 0; y < height; ++y) {
const SkPMColor16* row = this->addr16(0, y);
for (int x = 0; x < width; ++x) {
c &= row[x];
}
if (0xF != SkGetPackedA4444(c)) {
return false;
}
}
return true;
}
case kBGRA_8888_SkColorType:
case kRGBA_8888_SkColorType: {
SkPMColor c = (SkPMColor)~0;
for (int y = 0; y < height; ++y) {
const SkPMColor* row = this->addr32(0, y);
for (int x = 0; x < width; ++x) {
c &= row[x];
}
if (0xFF != SkGetPackedA32(c)) {
return false;
}
}
return true;
}
case kRGBA_F16Norm_SkColorType:
case kRGBA_F16_SkColorType: {
const SkHalf* row = (const SkHalf*)this->addr();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
if (row[4 * x + 3] < SK_Half1) {
return false;
}
}
row += this->rowBytes() >> 1;
}
return true;
}
case kRGBA_F32_SkColorType: {
const float* row = (const float*)this->addr();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
if (row[4 * x + 3] < 1.0f) {
return false;
}
}
row += this->rowBytes() >> 2;
}
return true;
}
case kRGBA_1010102_SkColorType: {
uint32_t c = ~0;
for (int y = 0; y < height; ++y) {
const uint32_t* row = this->addr32(0, y);
for (int x = 0; x < width; ++x) {
c &= row[x];
}
if (0b11 != c >> 30) {
return false;
}
}
return true;
}
case kR16G16B16A16_unorm_SkColorType: {
uint16_t acc = 0xFFFF;
for (int y = 0; y < height; ++y) {
const uint64_t* row = this->addr64(0, y);
for (int x = 0; x < width; ++x) {
acc &= (row[x] >> 48);
}
if (0xFFFF != acc) {
return false;
}
}
return true;
}
case kUnknown_SkColorType:
SkDEBUGFAIL("");
break;
}
return false;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
static bool draw_orientation(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
auto surf = SkSurface::MakeRasterDirect(dst.info(), dst.writable_addr(), dst.rowBytes());
if (!surf) {
return false;
}
SkBitmap bm;
bm.installPixels(src);
SkMatrix m = SkEncodedOriginToMatrix(origin, src.width(), src.height());
SkPaint p;
p.setBlendMode(SkBlendMode::kSrc);
surf->getCanvas()->concat(m);
surf->getCanvas()->drawBitmap(bm, 0, 0, &p);
return true;
}
bool SkPixmapPriv::Orient(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
if (src.colorType() != dst.colorType()) {
return false;
}
// note: we just ignore alphaType and colorSpace for this transformation
int w = src.width();
int h = src.height();
if (ShouldSwapWidthHeight(origin)) {
using std::swap;
swap(w, h);
}
if (dst.width() != w || dst.height() != h) {
return false;
}
if (w == 0 || h == 0) {
return true;
}
// check for aliasing to self
if (src.addr() == dst.addr()) {
return kTopLeft_SkEncodedOrigin == origin;
}
return draw_orientation(dst, src, origin);
}
bool SkPixmapPriv::ShouldSwapWidthHeight(SkEncodedOrigin origin) {
// The last four SkEncodedOrigin values involve 90 degree rotations
return origin >= kLeftTop_SkEncodedOrigin;
}
SkImageInfo SkPixmapPriv::SwapWidthHeight(const SkImageInfo& info) {
return info.makeWH(info.height(), info.width());
}