此篇讲图像采样 一、采样流程 在上一节里的流程图有写到，图像绘制的实际渲染发生在某个blitter的blitRect函数中，我们先看一个具体的blitRect实现。 void SkARGB32_Shader_Blitter::blitRect(int x, int y, int width, int height) { SkASSERT(x = 0 y = 0 x
此篇讲图像采样
void SkARGB32_Shader_Blitter::blitRect(int x, int y, int width, int height) {
SkASSERT(x >= 0 && y >= 0 &&
x + width shadeSpan(x, y, device, width);
span = device;
while (--height > 0) {
device = (uint32_t*)((char*)device + deviceRB);
memcpy(device, span, width shadeSpan(x, y, span, width);
SkXfermode* xfer = fXfermode;
if (xfer) {
do {
xfer->xfer32(device, span, width, NULL);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
} else {
SkBlitRow::Proc32 proc = fProc32;
do {
proc(device, span, width, 255);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
}
}
return;
}
if (fShadeDirectlyIntoDevice) {
void* ctx;
SkShader::Context::ShadeProc shadeProc = shaderContext->asAShadeProc(&ctx);
if (shadeProc) {
do {
shadeProc(ctx, x, y, device, width);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
} else {
do {
shaderContext->shadeSpan(x, y, device, width);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
}
} else {
SkXfermode* xfer = fXfermode;
if (xfer) {
do {
shaderContext->shadeSpan(x, y, span, width);
xfer->xfer32(device, span, width, NULL);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
} else {
SkBlitRow::Proc32 proc = fProc32;
do {
shaderContext->shadeSpan(x, y, span, width);
proc(device, span, width, 255);
y += 1;
device = (uint32_t*)((char*)device + deviceRB);
} while (--height > 0);
}
}
}对于图像绘制时，它是 SkBitmapProcShader，这里是其实现：
void SkBitmapProcShader::BitmapProcShaderContext::shadeSpan(int x, int y, SkPMColor dstC[],
int count) {
const SkBitmapProcState& state = *fState;
if (state.getShaderProc32()) {
state.getShaderProc32()(state, x, y, dstC, count);
return;
}
uint32_t buffer[BUF_MAX + TEST_BUFFER_EXTRA];
SkBitmapProcState::MatrixProc mproc = state.getMatrixProc();
SkBitmapProcState::SampleProc32 sproc = state.getSampleProc32();
int max = state.maxCountForBufferSize(sizeof(buffer[0]) * BUF_MAX);
SkASSERT(state.fBitmap->getPixels());
SkASSERT(state.fBitmap->pixelRef() == NULL ||
state.fBitmap->pixelRef()->isLocked());
for (;;) {
int n = count;
if (n > max) {
n = max;
}
SkASSERT(n > 0 && n 0);
x += n;
dstC += n;
}
}SkBlitter::Choose -> SkShader::createContext -> SkBitmapProcShader::onCreateContext -> SkBitmapProcState::chooseProcs
bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
SkASSERT(fOrigBitmap.width() && fOrigBitmap.height());
fBitmap = NULL;
fInvMatrix = inv;
fFilterLevel = paint.getFilterLevel();
SkASSERT(NULL == fScaledCacheID);
// possiblyScaleImage will look to see if it can rescale the image as a
// preprocess; either by scaling up to the target size, or by selecting
// a nearby mipmap level. If it does, it will adjust the working
// matrix as well as the working bitmap. It may also adjust the filter
// quality to avoid re-filtering an already perfectly scaled image.
if (!this->possiblyScaleImage()) {
if (!this->lockBaseBitmap()) {
return false;
}
}
// The above logic should have always assigned fBitmap, but in case it
// didn't, we check for that now...
// TODO(dominikg): Ask humper@ if we can just use an SkASSERT(fBitmap)?
if (NULL == fBitmap) {
return false;
}
// If we are "still" kMedium_FilterLevel, then the request was not fulfilled by possiblyScale,
// so we downgrade to kLow (so the rest of the sniffing code can assume that)
if (SkPaint::kMedium_FilterLevel == fFilterLevel) {
fFilterLevel = SkPaint::kLow_FilterLevel;
}
bool trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;
bool clampClamp = SkShader::kClamp_TileMode == fTileModeX &&
SkShader::kClamp_TileMode == fTileModeY;
if (!(clampClamp || trivialMatrix)) {
fInvMatrix.postIDiv(fOrigBitmap.width(), fOrigBitmap.height());
}
// Now that all possible changes to the matrix have taken place, check
// to see if we're really close to a no-scale matrix. If so, explicitly
// set it to be so. Subsequent code may inspect this matrix to choose
// a faster path in this case.
// This code will only execute if the matrix has some scale component;
// if it's already pure translate then we won't do this inversion.
if (matrix_only_scale_translate(fInvMatrix)) {
SkMatrix forward;
if (fInvMatrix.invert(&forward)) {
if (clampClamp ? just_trans_clamp(forward, *fBitmap)
: just_trans_general(forward)) {
SkScalar tx = -SkScalarRoundToScalar(forward.getTranslateX());
SkScalar ty = -SkScalarRoundToScalar(forward.getTranslateY());
fInvMatrix.setTranslate(tx, ty);
}
}
}
fInvProc = fInvMatrix.getMapXYProc();
fInvType = fInvMatrix.getType();
fInvSx = SkScalarToFixed(fInvMatrix.getScaleX());
fInvSxFractionalInt = SkScalarToFractionalInt(fInvMatrix.getScaleX());
fInvKy = SkScalarToFixed(fInvMatrix.getSkewY());
fInvKyFractionalInt = SkScalarToFractionalInt(fInvMatrix.getSkewY());
fAlphaScale = SkAlpha255To256(paint.getAlpha());
fShaderProc32 = NULL;
fShaderProc16 = NULL;
fSampleProc32 = NULL;
fSampleProc16 = NULL;
// recompute the triviality of the matrix here because we may have
// changed it!
trivialMatrix = (fInvMatrix.getType() & ~SkMatrix::kTranslate_Mask) == 0;
if (SkPaint::kHigh_FilterLevel == fFilterLevel) {
// If this is still set, that means we wanted HQ sampling
// but couldn't do it as a preprocess. Let's try to install
// the scanline version of the HQ sampler. If that process fails,
// downgrade to bilerp.
// NOTE: Might need to be careful here in the future when we want
// to have the platform proc have a shot at this; it's possible that
// the chooseBitmapFilterProc will fail to install a shader but a
// platform-specific one might succeed, so it might be premature here
// to fall back to bilerp. This needs thought.
if (!this->setBitmapFilterProcs()) {
fFilterLevel = SkPaint::kLow_FilterLevel;
}
}
if (SkPaint::kLow_FilterLevel == fFilterLevel) {
// Only try bilerp if the matrix is "interesting" and
// the image has a suitable size.
if (fInvType width() | fBitmap->height())) {
fFilterLevel = SkPaint::kNone_FilterLevel;
}
}
// At this point, we know exactly what kind of sampling the per-scanline
// shader will perform.
fMatrixProc = this->chooseMatrixProc(trivialMatrix);
// TODO(dominikg): SkASSERT(fMatrixProc) instead? chooseMatrixProc never returns NULL.
if (NULL == fMatrixProc) {
return false;
}
///////////////////////////////////////////////////////////////////////
// No need to do this if we're doing HQ sampling; if filter quality is
// still set to HQ by the time we get here, then we must have installed
// the shader procs above and can skip all this.
if (fFilterLevel SkPaint::kNone_FilterLevel) {
index |= 4;
}
// bits 3,4,5 encoding the source bitmap format
switch (fBitmap->colorType()) {
case kN32_SkColorType:
index |= 0;
break;
case kRGB_565_SkColorType:
index |= 8;
break;
case kIndex_8_SkColorType:
index |= 16;
break;
case kARGB_4444_SkColorType:
index |= 24;
break;
case kAlpha_8_SkColorType:
index |= 32;
fPaintPMColor = SkPreMultiplyColor(paint.getColor());
break;
default:
// TODO(dominikg): Should we ever get here? SkASSERT(false) instead?
return false;
}
#if !SK_ARM_NEON_IS_ALWAYS
static const SampleProc32 gSkBitmapProcStateSample32[] = {
S32_opaque_D32_nofilter_DXDY,
S32_alpha_D32_nofilter_DXDY,
S32_opaque_D32_nofilter_DX,
S32_alpha_D32_nofilter_DX,
S32_opaque_D32_filter_DXDY,
S32_alpha_D32_filter_DXDY,
S32_opaque_D32_filter_DX,
S32_alpha_D32_filter_DX,
S16_opaque_D32_nofilter_DXDY,
S16_alpha_D32_nofilter_DXDY,
S16_opaque_D32_nofilter_DX,
S16_alpha_D32_nofilter_DX,
S16_opaque_D32_filter_DXDY,
S16_alpha_D32_filter_DXDY,
S16_opaque_D32_filter_DX,
S16_alpha_D32_filter_DX,
SI8_opaque_D32_nofilter_DXDY,
SI8_alpha_D32_nofilter_DXDY,
SI8_opaque_D32_nofilter_DX,
SI8_alpha_D32_nofilter_DX,
SI8_opaque_D32_filter_DXDY,
SI8_alpha_D32_filter_DXDY,
SI8_opaque_D32_filter_DX,
SI8_alpha_D32_filter_DX,
S4444_opaque_D32_nofilter_DXDY,
S4444_alpha_D32_nofilter_DXDY,
S4444_opaque_D32_nofilter_DX,
S4444_alpha_D32_nofilter_DX,
S4444_opaque_D32_filter_DXDY,
S4444_alpha_D32_filter_DXDY,
S4444_opaque_D32_filter_DX,
S4444_alpha_D32_filter_DX,
// A8 treats alpha/opaque the same (equally efficient)
SA8_alpha_D32_nofilter_DXDY,
SA8_alpha_D32_nofilter_DXDY,
SA8_alpha_D32_nofilter_DX,
SA8_alpha_D32_nofilter_DX,
SA8_alpha_D32_filter_DXDY,
SA8_alpha_D32_filter_DXDY,
SA8_alpha_D32_filter_DX,
SA8_alpha_D32_filter_DX
};
static const SampleProc16 gSkBitmapProcStateSample16[] = {
S32_D16_nofilter_DXDY,
S32_D16_nofilter_DX,
S32_D16_filter_DXDY,
S32_D16_filter_DX,
S16_D16_nofilter_DXDY,
S16_D16_nofilter_DX,
S16_D16_filter_DXDY,
S16_D16_filter_DX,
SI8_D16_nofilter_DXDY,
SI8_D16_nofilter_DX,
SI8_D16_filter_DXDY,
SI8_D16_filter_DX,
// Don't support 4444 -> 565
NULL, NULL, NULL, NULL,
// Don't support A8 -> 565
NULL, NULL, NULL, NULL
};
#endif
fSampleProc32 = SK_ARM_NEON_WRAP(gSkBitmapProcStateSample32)[index];
index >>= 1; // shift away any opaque/alpha distinction
fSampleProc16 = SK_ARM_NEON_WRAP(gSkBitmapProcStateSample16)[index];
// our special-case shaderprocs
if (SK_ARM_NEON_WRAP(S16_D16_filter_DX) == fSampleProc16) {
if (clampClamp) {
fShaderProc16 = SK_ARM_NEON_WRAP(Clamp_S16_D16_filter_DX_shaderproc);
} else if (SkShader::kRepeat_TileMode == fTileModeX &&
SkShader::kRepeat_TileMode == fTileModeY) {
fShaderProc16 = SK_ARM_NEON_WRAP(Repeat_S16_D16_filter_DX_shaderproc);
}
} else if (SK_ARM_NEON_WRAP(SI8_opaque_D32_filter_DX) == fSampleProc32 && clampClamp) {
fShaderProc32 = SK_ARM_NEON_WRAP(Clamp_SI8_opaque_D32_filter_DX_shaderproc);
}
if (NULL == fShaderProc32) {
fShaderProc32 = this->chooseShaderProc32();
}
}
// see if our platform has any accelerated overrides
this->platformProcs();
return true;
}
nofilter_dxdy系列：
void MAKENAME(_nofilter_DXDY)(const SkBitmapProcState& s,
const uint32_t* SK_RESTRICT xy,
int count, DSTTYPE* SK_RESTRICT colors) {
for (int i = (count >> 1); i > 0; --i) {
XY = *xy++;
SkASSERT((XY >> 16) height() &&
(XY & 0xFFFF) width());
src = ((const SRCTYPE*)(srcAddr + (XY >> 16) * rb))[XY & 0xFFFF];
*colors++ = RETURNDST(src);
XY = *xy++;
SkASSERT((XY >> 16) height() &&
(XY & 0xFFFF) width());
src = ((const SRCTYPE*)(srcAddr + (XY >> 16) * rb))[XY & 0xFFFF];
*colors++ = RETURNDST(src);
}
if (count & 1) {
XY = *xy++;
SkASSERT((XY >> 16) height() &&
(XY & 0xFFFF) width());
src = ((const SRCTYPE*)(srcAddr + (XY >> 16) * rb))[XY & 0xFFFF];
*colors++ = RETURNDST(src);
}
}filter_dxdy系列：
void MAKENAME(_filter_DX)(const SkBitmapProcState& s,
const uint32_t* SK_RESTRICT xy,
int count, DSTTYPE* SK_RESTRICT colors) {
SkASSERT(count > 0 && colors != NULL);
SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
SkDEBUGCODE(CHECKSTATE(s);)
#ifdef PREAMBLE
PREAMBLE(s);
#endif
const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
size_t rb = s.fBitmap->rowBytes();
unsigned subY;
const SRCTYPE* SK_RESTRICT row0;
const SRCTYPE* SK_RESTRICT row1;
// setup row ptrs and update proc_table
{
uint32_t XY = *xy++;
unsigned y0 = XY >> 14;
row0 = (const SRCTYPE*)(srcAddr + (y0 >> 4) * rb);
row1 = (const SRCTYPE*)(srcAddr + (XY & 0x3FFF) * rb);
subY = y0 & 0xF;
}
do {
uint32_t XX = *xy++; // x0:14 | 4 | x1:14
unsigned x0 = XX >> 14;
unsigned x1 = XX & 0x3FFF;
unsigned subX = x0 & 0xF;
x0 >>= 4;
FILTER_PROC(subX, subY,
SRC_TO_FILTER(row0[x0]),
SRC_TO_FILTER(row0[x1]),
SRC_TO_FILTER(row1[x0]),
SRC_TO_FILTER(row1[x1]),
colors);
colors += 1;
} while (--count != 0);
#ifdef POSTAMBLE
POSTAMBLE(s);
#endif
}
void MAKENAME(_filter_DXDY)(const SkBitmapProcState& s,
const uint32_t* SK_RESTRICT xy,
int count, DSTTYPE* SK_RESTRICT colors) {
SkASSERT(count > 0 && colors != NULL);
SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
SkDEBUGCODE(CHECKSTATE(s);)
#ifdef PREAMBLE
PREAMBLE(s);
#endif
const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
size_t rb = s.fBitmap->rowBytes();
do {
uint32_t data = *xy++;
unsigned y0 = data >> 14;
unsigned y1 = data & 0x3FFF;
unsigned subY = y0 & 0xF;
y0 >>= 4;
data = *xy++;
unsigned x0 = data >> 14;
unsigned x1 = data & 0x3FFF;
unsigned subX = x0 & 0xF;
x0 >>= 4;
const SRCTYPE* SK_RESTRICT row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
const SRCTYPE* SK_RESTRICT row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
FILTER_PROC(subX, subY,
SRC_TO_FILTER(row0[x0]),
SRC_TO_FILTER(row0[x1]),
SRC_TO_FILTER(row1[x0]),
SRC_TO_FILTER(row1[x1]),
colors);
colors += 1;
} while (--count != 0);
#ifdef POSTAMBLE
POSTAMBLE(s);
#endif
}
先跟进 chooseMatrixProc的代码：
SkBitmapProcState::MatrixProc SkBitmapProcState::chooseMatrixProc(bool trivial_matrix) {
// test_int_tileprocs();
// check for our special case when there is no scale/affine/perspective
if (trivial_matrix) {
SkASSERT(SkPaint::kNone_FilterLevel == fFilterLevel);
fIntTileProcY = choose_int_tile_proc(fTileModeY);
switch (fTileModeX) {
case SkShader::kClamp_TileMode:
return clampx_nofilter_trans;
case SkShader::kRepeat_TileMode:
return repeatx_nofilter_trans;
case SkShader::kMirror_TileMode:
return mirrorx_nofilter_trans;
}
}
int index = 0;
if (fFilterLevel != SkPaint::kNone_FilterLevel) {
index = 1;
}
if (fInvType & SkMatrix::kPerspective_Mask) {
index += 4;
} else if (fInvType & SkMatrix::kAffine_Mask) {
index += 2;
}
if (SkShader::kClamp_TileMode == fTileModeX && SkShader::kClamp_TileMode == fTileModeY) {
// clamp gets special version of filterOne
fFilterOneX = SK_Fixed1;
fFilterOneY = SK_Fixed1;
return SK_ARM_NEON_WRAP(ClampX_ClampY_Procs)[index];
}
// all remaining procs use this form for filterOne
fFilterOneX = SK_Fixed1 / fBitmap->width();
fFilterOneY = SK_Fixed1 / fBitmap->height();
if (SkShader::kRepeat_TileMode == fTileModeX && SkShader::kRepeat_TileMode == fTileModeY) {
return SK_ARM_NEON_WRAP(RepeatX_RepeatY_Procs)[index];
}
fTileProcX = choose_tile_proc(fTileModeX);
fTileProcY = choose_tile_proc(fTileModeY);
fTileLowBitsProcX = choose_tile_lowbits_proc(fTileModeX);
fTileLowBitsProcY = choose_tile_lowbits_proc(fTileModeY);
return GeneralXY_Procs[index];
}#if !SK_ARM_NEON_IS_ALWAYS #define MAKENAME(suffix) ClampX_ClampY ## suffix #define TILEX_PROCF(fx, max) SkClampMax((fx) >> 16, max) #define TILEY_PROCF(fy, max) SkClampMax((fy) >> 16, max) #define TILEX_LOW_BITS(fx, max) (((fx) >> 12) & 0xF) #define TILEY_LOW_BITS(fy, max) (((fy) >> 12) & 0xF) #define CHECK_FOR_DECAL #include "SkBitmapProcState_matrix.h"
头文件代码如下：
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkMath.h"
#include "SkMathPriv.h"
#define SCALE_FILTER_NAME MAKENAME(_filter_scale)
#define AFFINE_FILTER_NAME MAKENAME(_filter_affine)
#define PERSP_FILTER_NAME MAKENAME(_filter_persp)
#define PACK_FILTER_X_NAME MAKENAME(_pack_filter_x)
#define PACK_FILTER_Y_NAME MAKENAME(_pack_filter_y)
#ifndef PREAMBLE
#define PREAMBLE(state)
#define PREAMBLE_PARAM_X
#define PREAMBLE_PARAM_Y
#define PREAMBLE_ARG_X
#define PREAMBLE_ARG_Y
#endif
// declare functions externally to suppress warnings.
void SCALE_FILTER_NAME(const SkBitmapProcState& s,
uint32_t xy[], int count, int x, int y);
void AFFINE_FILTER_NAME(const SkBitmapProcState& s,
uint32_t xy[], int count, int x, int y);
void PERSP_FILTER_NAME(const SkBitmapProcState& s,
uint32_t* SK_RESTRICT xy, int count,
int x, int y);
static inline uint32_t PACK_FILTER_Y_NAME(SkFixed f, unsigned max,
SkFixed one PREAMBLE_PARAM_Y) {
unsigned i = TILEY_PROCF(f, max);
i = (i width() - 1;
const SkFixed one = s.fFilterOneX;
const SkFractionalInt dx = s.fInvSxFractionalInt;
SkFractionalInt fx;
{
SkPoint pt;
s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
SkIntToScalar(y) + SK_ScalarHalf, &pt);
const SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
const unsigned maxY = s.fBitmap->height() - 1;
// compute our two Y values up front
*xy++ = PACK_FILTER_Y_NAME(fy, maxY, s.fFilterOneY PREAMBLE_ARG_Y);
// now initialize fx
fx = SkScalarToFractionalInt(pt.fX) - (SkFixedToFractionalInt(one) >> 1);
}
#ifdef CHECK_FOR_DECAL
if (can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
decal_filter_scale(xy, SkFractionalIntToFixed(fx),
SkFractionalIntToFixed(dx), count);
} else
#endif
{
do {
SkFixed fixedFx = SkFractionalIntToFixed(fx);
*xy++ = PACK_FILTER_X_NAME(fixedFx, maxX, one PREAMBLE_ARG_X);
fx += dx;
} while (--count != 0);
}
}
void AFFINE_FILTER_NAME(const SkBitmapProcState& s,
uint32_t xy[], int count, int x, int y) {
SkASSERT(s.fInvType & SkMatrix::kAffine_Mask);
SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
SkMatrix::kScale_Mask |
SkMatrix::kAffine_Mask)) == 0);
PREAMBLE(s);
SkPoint srcPt;
s.fInvProc(s.fInvMatrix,
SkIntToScalar(x) + SK_ScalarHalf,
SkIntToScalar(y) + SK_ScalarHalf, &srcPt);
SkFixed oneX = s.fFilterOneX;
SkFixed oneY = s.fFilterOneY;
SkFixed fx = SkScalarToFixed(srcPt.fX) - (oneX >> 1);
SkFixed fy = SkScalarToFixed(srcPt.fY) - (oneY >> 1);
SkFixed dx = s.fInvSx;
SkFixed dy = s.fInvKy;
unsigned maxX = s.fBitmap->width() - 1;
unsigned maxY = s.fBitmap->height() - 1;
do {
*xy++ = PACK_FILTER_Y_NAME(fy, maxY, oneY PREAMBLE_ARG_Y);
fy += dy;
*xy++ = PACK_FILTER_X_NAME(fx, maxX, oneX PREAMBLE_ARG_X);
fx += dx;
} while (--count != 0);
}
void PERSP_FILTER_NAME(const SkBitmapProcState& s,
uint32_t* SK_RESTRICT xy, int count,
int x, int y) {
SkASSERT(s.fInvType & SkMatrix::kPerspective_Mask);
PREAMBLE(s);
unsigned maxX = s.fBitmap->width() - 1;
unsigned maxY = s.fBitmap->height() - 1;
SkFixed oneX = s.fFilterOneX;
SkFixed oneY = s.fFilterOneY;
SkPerspIter iter(s.fInvMatrix,
SkIntToScalar(x) + SK_ScalarHalf,
SkIntToScalar(y) + SK_ScalarHalf, count);
while ((count = iter.next()) != 0) {
const SkFixed* SK_RESTRICT srcXY = iter.getXY();
do {
*xy++ = PACK_FILTER_Y_NAME(srcXY[1] - (oneY >> 1), maxY,
oneY PREAMBLE_ARG_Y);
*xy++ = PACK_FILTER_X_NAME(srcXY[0] - (oneX >> 1), maxX,
oneX PREAMBLE_ARG_X);
srcXY += 2;
} while (--count != 0);
}
}
#undef MAKENAME
#undef TILEX_PROCF
#undef TILEY_PROCF
#ifdef CHECK_FOR_DECAL
#undef CHECK_FOR_DECAL
#endif
#undef SCALE_FILTER_NAME
#undef AFFINE_FILTER_NAME
#undef PERSP_FILTER_NAME
#undef PREAMBLE
#undef PREAMBLE_PARAM_X
#undef PREAMBLE_PARAM_Y
#undef PREAMBLE_ARG_X
#undef PREAMBLE_ARG_Y
#undef TILEX_LOW_BITS
#undef TILEY_LOW_BITS
So ändern Sie den Text im Bild
Was tun, wenn das eingebettete Bild nicht vollständig angezeigt wird?
So lassen Sie PPT-Bilder einzeln erscheinen
So erstellen Sie ein rundes Bild in ppt
Warum kann win11 nicht installiert werden?
Einführung in die Eigenschaften des virtuellen Raums
Komplementalgorithmus für negative Zahlen
hat eine eigene Grundstücksnutzung
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
