// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxge/dib/cstretchengine.h"
#include <algorithm>
#include <utility>
#include "core/fxcrt/ifx_pauseindicator.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "core/fxge/dib/cfx_dibsource.h"
#include "core/fxge/dib/ifx_scanlinecomposer.h"
#include "core/fxge/fx_dib.h"
namespace {
const int kMaxDestValue = 16711680;
} // namespace
CStretchEngine::CWeightTable::CWeightTable()
: m_DestMin(0),
m_ItemSize(0),
m_dwWeightTablesSize(0) {}
CStretchEngine::CWeightTable::~CWeightTable() {}
size_t CStretchEngine::CWeightTable::GetPixelWeightSize() const {
return m_ItemSize / sizeof(int) - 2;
}
bool CStretchEngine::CWeightTable::Calc(int dest_len,
int dest_min,
int dest_max,
int src_len,
int src_min,
int src_max,
int flags) {
m_WeightTables.clear();
m_dwWeightTablesSize = 0;
const double scale = static_cast<float>(src_len) / dest_len;
const double base = dest_len < 0 ? src_len : 0;
const int ext_size = flags & FXDIB_BICUBIC_INTERPOL ? 3 : 1;
m_ItemSize =
sizeof(int) * 2 +
static_cast<int>(sizeof(int) *
(ceil(fabs(static_cast<float>(scale))) + ext_size));
m_DestMin = dest_min;
if (dest_max - dest_min > static_cast<int>((1U << 30) - 4) / m_ItemSize)
return false;
m_dwWeightTablesSize = (dest_max - dest_min) * m_ItemSize + 4;
m_WeightTables.resize(m_dwWeightTablesSize);
if ((flags & FXDIB_NOSMOOTH) != 0 || fabs(static_cast<float>(scale)) < 1.0f) {
for (int dest_pixel = dest_min; dest_pixel < dest_max; ++dest_pixel) {
PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel);
double src_pos = dest_pixel * scale + scale / 2 + base;
if (flags & FXDIB_INTERPOL) {
pixel_weights.m_SrcStart =
static_cast<int>(floor(static_cast<float>(src_pos) - 1.0f / 2));
pixel_weights.m_SrcEnd =
static_cast<int>(floor(static_cast<float>(src_pos) + 1.0f / 2));
pixel_weights.m_SrcStart = std::max(pixel_weights.m_SrcStart, src_min);
pixel_weights.m_SrcEnd = std::min(pixel_weights.m_SrcEnd, src_max - 1);
if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
pixel_weights.m_Weights[0] = 65536;
} else {
pixel_weights.m_Weights[1] =
FXSYS_round(static_cast<float>(
src_pos - pixel_weights.m_SrcStart - 1.0f / 2) *
65536);
pixel_weights.m_Weights[0] = 65536 - pixel_weights.m_Weights[1];
}
} else if (flags & FXDIB_BICUBIC_INTERPOL) {
pixel_weights.m_SrcStart =
static_cast<int>(floor(static_cast<float>(src_pos) - 1.0f / 2));
pixel_weights.m_SrcEnd =
static_cast<int>(floor(static_cast<float>(src_pos) + 1.0f / 2));
int start = pixel_weights.m_SrcStart - 1;
int end = pixel_weights.m_SrcEnd + 1;
start = std::max(start, src_min);
end = std::min(end, src_max - 1);
if (pixel_weights.m_SrcStart < src_min) {
src_pos += src_min - pixel_weights.m_SrcStart;
pixel_weights.m_SrcStart = src_min;
}
pixel_weights.m_SrcEnd = std::min(pixel_weights.m_SrcEnd, src_max - 1);
int weight = FXSYS_round(
static_cast<float>(src_pos - pixel_weights.m_SrcStart - 1.0f / 2) *
256);
if (start == end) {
pixel_weights.m_Weights[0] =
(SDP_Table[256 + weight] + SDP_Table[weight] +
SDP_Table[256 - weight] + SDP_Table[512 - weight])
<< 8;
} else if ((start == pixel_weights.m_SrcStart &&
(pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd ||
end == pixel_weights.m_SrcEnd) &&
start < end) ||
(start < pixel_weights.m_SrcStart &&
pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd &&
end == pixel_weights.m_SrcEnd)) {
if (start < pixel_weights.m_SrcStart) {
pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
pixel_weights.m_Weights[1] =
(SDP_Table[weight] + SDP_Table[256 - weight] +
SDP_Table[512 - weight])
<< 8;
} else {
if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
pixel_weights.m_Weights[0] =
(SDP_Table[256 + weight] + SDP_Table[weight] +
SDP_Table[256 - weight])
<< 8;
pixel_weights.m_Weights[1] = SDP_Table[512 - weight] << 8;
} else {
pixel_weights.m_Weights[0] =
(SDP_Table[256 + weight] + SDP_Table[weight]) << 8;
pixel_weights.m_Weights[1] =
(SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8;
}
}
if (pixel_weights.m_SrcStart == pixel_weights.m_SrcEnd) {
pixel_weights.m_SrcEnd = end;
}
if (start < pixel_weights.m_SrcStart) {
pixel_weights.m_SrcStart = start;
}
} else if (start == pixel_weights.m_SrcStart &&
start < pixel_weights.m_SrcEnd &&
pixel_weights.m_SrcEnd < end) {
pixel_weights.m_Weights[0] =
(SDP_Table[256 + weight] + SDP_Table[weight]) << 8;
pixel_weights.m_Weights[1] = SDP_Table[256 - weight] << 8;
pixel_weights.m_Weights[2] = SDP_Table[512 - weight] << 8;
pixel_weights.m_SrcEnd = end;
} else if (start < pixel_weights.m_SrcStart &&
pixel_weights.m_SrcStart < pixel_weights.m_SrcEnd &&
pixel_weights.m_SrcEnd == end) {
pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
pixel_weights.m_Weights[1] = SDP_Table[weight] << 8;
pixel_weights.m_Weights[2] =
(SDP_Table[256 - weight] + SDP_Table[512 - weight]) << 8;
pixel_weights.m_SrcStart = start;
} else {
pixel_weights.m_Weights[0] = SDP_Table[256 + weight] << 8;
pixel_weights.m_Weights[1] = SDP_Table[weight] << 8;
pixel_weights.m_Weights[2] = SDP_Table[256 - weight] << 8;
pixel_weights.m_Weights[3] = SDP_Table[512 - weight] << 8;
pixel_weights.m_SrcStart = start;
pixel_weights.m_SrcEnd = end;
}
} else {
int pixel_pos = static_cast<int>(floor(static_cast<float>(src_pos)));
pixel_weights.m_SrcStart = std::max(pixel_pos, src_min);
pixel_weights.m_SrcEnd = std::min(pixel_pos, src_max - 1);
pixel_weights.m_Weights[0] = 65536;
}
}
return true;
}
for (int dest_pixel = dest_min; dest_pixel < dest_max; ++dest_pixel) {
PixelWeight& pixel_weights = *GetPixelWeight(dest_pixel);
double src_start = dest_pixel * scale + base;
double src_end = src_start + scale;
int start_i = floor(std::min(src_start, src_end));
int end_i = floor(std::max(src_start, src_end));
start_i = std::max(start_i, src_min);
end_i = std::min(end_i, src_max - 1);
if (start_i > end_i) {
start_i = std::min(start_i, src_max - 1);
pixel_weights.m_SrcStart = start_i;
pixel_weights.m_SrcEnd = start_i;
continue;
}
pixel_weights.m_SrcStart = start_i;
pixel_weights.m_SrcEnd = end_i;
for (int j = start_i; j <= end_i; ++j) {
double dest_start = (j - base) / scale;
double dest_end = (j + 1 - base) / scale;
if (dest_start > dest_end)
std::swap(dest_start, dest_end);
double area_start = std::max(dest_start, static_cast<double>(dest_pixel));
double area_end = std::min(dest_end, static_cast<double>(dest_pixel + 1));
double weight = std::max(0.0, area_end - area_start);
if (weight == 0 && j == end_i) {
--pixel_weights.m_SrcEnd;
break;
}
size_t idx = j - start_i;
if (idx >= GetPixelWeightSize())
return false;
pixel_weights.m_Weights[idx] = FXSYS_round(weight * 65536);
}
}
return true;
}
PixelWeight* CStretchEngine::CWeightTable::GetPixelWeight(int pixel) const {
ASSERT(pixel >= m_DestMin);
return reinterpret_cast<PixelWeight*>(const_cast<uint8_t*>(
m_WeightTables.data() + (pixel - m_DestMin) * m_ItemSize));
}
int* CStretchEngine::CWeightTable::GetValueFromPixelWeight(PixelWeight* pWeight,
int index) const {
if (index < pWeight->m_SrcStart)
return nullptr;
size_t idx = index - pWeight->m_SrcStart;
return idx < GetPixelWeightSize() ? &pWeight->m_Weights[idx] : nullptr;
}
CStretchEngine::CStretchEngine(IFX_ScanlineComposer* pDestBitmap,
FXDIB_Format dest_format,
int dest_width,
int dest_height,
const FX_RECT& clip_rect,
const RetainPtr<CFX_DIBSource>& pSrcBitmap,
int flags) {
m_State = 0;
m_DestFormat = dest_format;
m_DestBpp = dest_format & 0xff;
m_SrcBpp = pSrcBitmap->GetFormat() & 0xff;
m_bHasAlpha = pSrcBitmap->GetFormat() & 0x200;
m_pSrcPalette = pSrcBitmap->GetPalette();
m_pDestBitmap = pDestBitmap;
m_DestWidth = dest_width;
m_DestHeight = dest_height;
m_DestClip = clip_rect;
uint32_t size = clip_rect.Width();
if (size && m_DestBpp > static_cast<int>(INT_MAX / size))
return;
size *= m_DestBpp;
if (size > INT_MAX - 31)
return;
size += 31;
size = size / 32 * 4;
m_DestScanline.resize(size);
if (dest_format == FXDIB_Rgb32)
std::fill(m_DestScanline.begin(), m_DestScanline.end(), 255);
m_InterPitch = (m_DestClip.Width() * m_DestBpp + 31) / 32 * 4;
m_ExtraMaskPitch = (m_DestClip.Width() * 8 + 31) / 32 * 4;
m_pSource = pSrcBitmap;
m_SrcWidth = pSrcBitmap->GetWidth();
m_SrcHeight = pSrcBitmap->GetHeight();
m_SrcPitch = (m_SrcWidth * m_SrcBpp + 31) / 32 * 4;
if ((flags & FXDIB_NOSMOOTH) == 0) {
bool bInterpol = flags & FXDIB_INTERPOL || flags & FXDIB_BICUBIC_INTERPOL;
if (!bInterpol && abs(dest_width) != 0 &&
abs(dest_height) / 8 < static_cast<long long>(m_SrcWidth) *
m_SrcHeight / abs(dest_width)) {
flags = FXDIB_INTERPOL;
}
m_Flags = flags;
} else {
m_Flags = FXDIB_NOSMOOTH;
if (flags & FXDIB_DOWNSAMPLE)
m_Flags |= FXDIB_DOWNSAMPLE;
}
double scale_x = static_cast<float>(m_SrcWidth) / m_DestWidth;
double scale_y = static_cast<float>(m_SrcHeight) / m_DestHeight;
double base_x = m_DestWidth > 0 ? 0.0f : m_DestWidth;
double base_y = m_DestHeight > 0 ? 0.0f : m_DestHeight;
double src_left = scale_x * (clip_rect.left + base_x);
double src_right = scale_x * (clip_rect.right + base_x);
double src_top = scale_y * (clip_rect.top + base_y);
double src_bottom = scale_y * (clip_rect.bottom + base_y);
if (src_left > src_right)
std::swap(src_left, src_right);
if (src_top > src_bottom)
std::swap(src_top, src_bottom);
m_SrcClip.left = static_cast<int>(floor(src_left));
m_SrcClip.right = static_cast<int>(ceil(src_right));
m_SrcClip.top = static_cast<int>(floor(src_top));
m_SrcClip.bottom = static_cast<int>(ceil(src_bottom));
FX_RECT src_rect(0, 0, m_SrcWidth, m_SrcHeight);
m_SrcClip.Intersect(src_rect);
if (m_SrcBpp == 1) {
if (m_DestBpp == 8)
m_TransMethod = 1;
else
m_TransMethod = 2;
} else if (m_SrcBpp == 8) {
if (m_DestBpp == 8) {
if (!m_bHasAlpha)
m_TransMethod = 3;
else
m_TransMethod = 4;
} else {
if (!m_bHasAlpha)
m_TransMethod = 5;
else
m_TransMethod = 6;
}
} else {
if (!m_bHasAlpha)
m_TransMethod = 7;
else
m_TransMethod = 8;
}
}
CStretchEngine::~CStretchEngine() {}
bool CStretchEngine::Continue(IFX_PauseIndicator* pPause) {
while (m_State == 1) {
if (ContinueStretchHorz(pPause))
return true;
m_State = 2;
StretchVert();
}
return false;
}
bool CStretchEngine::StartStretchHorz() {
if (m_DestWidth == 0 || m_InterPitch == 0 || m_DestScanline.empty())
return false;
if (m_SrcClip.Height() == 0 ||
m_SrcClip.Height() > (1 << 29) / m_InterPitch) {
return false;
}
m_InterBuf.resize(m_SrcClip.Height() * m_InterPitch);
if (m_pSource && m_bHasAlpha && m_pSource->m_pAlphaMask) {
m_ExtraAlphaBuf.resize(m_SrcClip.Height(), m_ExtraMaskPitch);
uint32_t size = (m_DestClip.Width() * 8 + 31) / 32 * 4;
m_DestMaskScanline.resize(size);
}
bool ret =
m_WeightTable.Calc(m_DestWidth, m_DestClip.left, m_DestClip.right,
m_SrcWidth, m_SrcClip.left, m_SrcClip.right, m_Flags);
if (!ret)
return false;
m_CurRow = m_SrcClip.top;
m_State = 1;
return true;
}
bool CStretchEngine::ContinueStretchHorz(IFX_PauseIndicator* pPause) {
if (!m_DestWidth)
return false;
if (m_pSource->SkipToScanline(m_CurRow, pPause))
return true;
int Bpp = m_DestBpp / 8;
static const int kStrechPauseRows = 10;
int rows_to_go = kStrechPauseRows;
for (; m_CurRow < m_SrcClip.bottom; ++m_CurRow) {
if (rows_to_go == 0) {
if (pPause && pPause->NeedToPauseNow())
return true;
rows_to_go = kStrechPauseRows;
}
const uint8_t* src_scan = m_pSource->GetScanline(m_CurRow);
uint8_t* dest_scan =
m_InterBuf.data() + (m_CurRow - m_SrcClip.top) * m_InterPitch;
const uint8_t* src_scan_mask = nullptr;
uint8_t* dest_scan_mask = nullptr;
if (!m_ExtraAlphaBuf.empty()) {
src_scan_mask = m_pSource->m_pAlphaMask->GetScanline(m_CurRow);
dest_scan_mask = m_ExtraAlphaBuf.data() +
(m_CurRow - m_SrcClip.top) * m_ExtraMaskPitch;
}
// TODO(npm): reduce duplicated code here
switch (m_TransMethod) {
case 1:
case 2: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_a = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
if (src_scan[j / 8] & (1 << (7 - j % 8)))
dest_a += pixel_weight * 255;
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL)
dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue);
*dest_scan++ = static_cast<uint8_t>(dest_a >> 16);
}
break;
}
case 3: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_a = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
dest_a += pixel_weight * src_scan[j];
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL)
dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue);
*dest_scan++ = static_cast<uint8_t>(dest_a >> 16);
}
break;
}
case 4: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_a = 0;
int dest_r = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
pixel_weight = pixel_weight * src_scan_mask[j] / 255;
dest_r += pixel_weight * src_scan[j];
dest_a += pixel_weight;
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_r = pdfium::clamp(dest_r, 0, kMaxDestValue);
dest_a = pdfium::clamp(dest_a, 0, 65536);
}
*dest_scan++ = static_cast<uint8_t>(dest_r >> 16);
*dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16);
}
break;
}
case 5: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]];
if (m_DestFormat == FXDIB_Rgb) {
dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16);
dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8);
dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk);
} else {
dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 24);
dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16);
dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8);
}
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
}
*dest_scan++ = static_cast<uint8_t>(dest_b_c >> 16);
*dest_scan++ = static_cast<uint8_t>(dest_g_m >> 16);
*dest_scan++ = static_cast<uint8_t>(dest_r_y >> 16);
}
break;
}
case 6: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_a = 0;
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
pixel_weight = pixel_weight * src_scan_mask[j] / 255;
unsigned long argb_cmyk = m_pSrcPalette[src_scan[j]];
if (m_DestFormat == FXDIB_Rgba) {
dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16);
dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8);
dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk);
} else {
dest_b_c += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 24);
dest_g_m += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 16);
dest_r_y += pixel_weight * static_cast<uint8_t>(argb_cmyk >> 8);
}
dest_a += pixel_weight;
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
dest_a = pdfium::clamp(dest_a, 0, 65536);
}
*dest_scan++ = static_cast<uint8_t>(dest_b_c >> 16);
*dest_scan++ = static_cast<uint8_t>(dest_g_m >> 16);
*dest_scan++ = static_cast<uint8_t>(dest_r_y >> 16);
*dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16);
}
break;
}
case 7: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
const uint8_t* src_pixel = src_scan + j * Bpp;
dest_b_c += pixel_weight * (*src_pixel++);
dest_g_m += pixel_weight * (*src_pixel++);
dest_r_y += pixel_weight * (*src_pixel);
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
}
*dest_scan++ = static_cast<uint8_t>((dest_b_c) >> 16);
*dest_scan++ = static_cast<uint8_t>((dest_g_m) >> 16);
*dest_scan++ = static_cast<uint8_t>((dest_r_y) >> 16);
dest_scan += Bpp - 3;
}
break;
}
case 8: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
PixelWeight* pWeights = m_WeightTable.GetPixelWeight(col);
int dest_a = 0;
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = m_WeightTable.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return false;
int pixel_weight = *pWeight;
const uint8_t* src_pixel = src_scan + j * Bpp;
if (m_DestFormat == FXDIB_Argb) {
pixel_weight = pixel_weight * src_pixel[3] / 255;
} else {
pixel_weight = pixel_weight * src_scan_mask[j] / 255;
}
dest_b_c += pixel_weight * (*src_pixel++);
dest_g_m += pixel_weight * (*src_pixel++);
dest_r_y += pixel_weight * (*src_pixel);
dest_a += pixel_weight;
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
dest_a = pdfium::clamp(dest_a, 0, 65536);
}
*dest_scan++ = static_cast<uint8_t>((dest_b_c) >> 16);
*dest_scan++ = static_cast<uint8_t>((dest_g_m) >> 16);
*dest_scan++ = static_cast<uint8_t>((dest_r_y) >> 16);
if (m_DestFormat == FXDIB_Argb)
*dest_scan = static_cast<uint8_t>((dest_a * 255) >> 16);
if (dest_scan_mask)
*dest_scan_mask++ = static_cast<uint8_t>((dest_a * 255) >> 16);
dest_scan += Bpp - 3;
}
break;
}
}
rows_to_go--;
}
return false;
}
void CStretchEngine::StretchVert() {
if (m_DestHeight == 0)
return;
CWeightTable table;
bool ret = table.Calc(m_DestHeight, m_DestClip.top, m_DestClip.bottom,
m_SrcHeight, m_SrcClip.top, m_SrcClip.bottom, m_Flags);
if (!ret)
return;
const int DestBpp = m_DestBpp / 8;
for (int row = m_DestClip.top; row < m_DestClip.bottom; ++row) {
unsigned char* dest_scan = m_DestScanline.data();
unsigned char* dest_scan_mask = m_DestMaskScanline.data();
PixelWeight* pWeights = table.GetPixelWeight(row);
switch (m_TransMethod) {
case 1:
case 2:
case 3: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
unsigned char* src_scan =
m_InterBuf.data() + (col - m_DestClip.left) * DestBpp;
int dest_a = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = table.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return;
int pixel_weight = *pWeight;
dest_a +=
pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch];
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL)
dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue);
*dest_scan = static_cast<uint8_t>(dest_a >> 16);
dest_scan += DestBpp;
}
break;
}
case 4: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
unsigned char* src_scan =
m_InterBuf.data() + (col - m_DestClip.left) * DestBpp;
unsigned char* src_scan_mask =
m_ExtraAlphaBuf.data() + (col - m_DestClip.left);
int dest_a = 0;
int dest_k = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = table.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return;
int pixel_weight = *pWeight;
dest_k +=
pixel_weight * src_scan[(j - m_SrcClip.top) * m_InterPitch];
dest_a += pixel_weight *
src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch];
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_k = pdfium::clamp(dest_k, 0, kMaxDestValue);
dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue);
}
*dest_scan = static_cast<uint8_t>(dest_k >> 16);
dest_scan += DestBpp;
*dest_scan_mask++ = static_cast<uint8_t>(dest_a >> 16);
}
break;
}
case 5:
case 7: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
unsigned char* src_scan =
m_InterBuf.data() + (col - m_DestClip.left) * DestBpp;
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = table.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return;
int pixel_weight = *pWeight;
const uint8_t* src_pixel =
src_scan + (j - m_SrcClip.top) * m_InterPitch;
dest_b_c += pixel_weight * (*src_pixel++);
dest_g_m += pixel_weight * (*src_pixel++);
dest_r_y += pixel_weight * (*src_pixel);
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
}
dest_scan[0] = static_cast<uint8_t>((dest_b_c) >> 16);
dest_scan[1] = static_cast<uint8_t>((dest_g_m) >> 16);
dest_scan[2] = static_cast<uint8_t>((dest_r_y) >> 16);
dest_scan += DestBpp;
}
break;
}
case 6:
case 8: {
for (int col = m_DestClip.left; col < m_DestClip.right; ++col) {
unsigned char* src_scan =
m_InterBuf.data() + (col - m_DestClip.left) * DestBpp;
unsigned char* src_scan_mask = nullptr;
if (m_DestFormat != FXDIB_Argb)
src_scan_mask = m_ExtraAlphaBuf.data() + (col - m_DestClip.left);
int dest_a = 0;
int dest_r_y = 0;
int dest_g_m = 0;
int dest_b_c = 0;
for (int j = pWeights->m_SrcStart; j <= pWeights->m_SrcEnd; ++j) {
int* pWeight = table.GetValueFromPixelWeight(pWeights, j);
if (!pWeight)
return;
int pixel_weight = *pWeight;
const uint8_t* src_pixel =
src_scan + (j - m_SrcClip.top) * m_InterPitch;
int mask_v = 255;
if (src_scan_mask)
mask_v = src_scan_mask[(j - m_SrcClip.top) * m_ExtraMaskPitch];
dest_b_c += pixel_weight * (*src_pixel++);
dest_g_m += pixel_weight * (*src_pixel++);
dest_r_y += pixel_weight * (*src_pixel);
if (m_DestFormat == FXDIB_Argb)
dest_a += pixel_weight * (*(src_pixel + 1));
else
dest_a += pixel_weight * mask_v;
}
if (m_Flags & FXDIB_BICUBIC_INTERPOL) {
dest_r_y = pdfium::clamp(dest_r_y, 0, kMaxDestValue);
dest_g_m = pdfium::clamp(dest_g_m, 0, kMaxDestValue);
dest_b_c = pdfium::clamp(dest_b_c, 0, kMaxDestValue);
dest_a = pdfium::clamp(dest_a, 0, kMaxDestValue);
}
if (dest_a) {
int r = static_cast<uint32_t>(dest_r_y) * 255 / dest_a;
int g = static_cast<uint32_t>(dest_g_m) * 255 / dest_a;
int b = static_cast<uint32_t>(dest_b_c) * 255 / dest_a;
dest_scan[0] = pdfium::clamp(b, 0, 255);
dest_scan[1] = pdfium::clamp(g, 0, 255);
dest_scan[2] = pdfium::clamp(r, 0, 255);
}
if (m_DestFormat == FXDIB_Argb)
dest_scan[3] = static_cast<uint8_t>((dest_a) >> 16);
else
*dest_scan_mask = static_cast<uint8_t>((dest_a) >> 16);
dest_scan += DestBpp;
if (dest_scan_mask)
dest_scan_mask++;
}
break;
}
}
m_pDestBitmap->ComposeScanline(row - m_DestClip.top, m_DestScanline.data(),
m_DestMaskScanline.data());
}
}