diff options
Diffstat (limited to 'core/fxge/dib/cstretchengine.cpp')
| -rw-r--r-- | core/fxge/dib/cstretchengine.cpp | 830 |
1 files changed, 830 insertions, 0 deletions
diff --git a/core/fxge/dib/cstretchengine.cpp b/core/fxge/dib/cstretchengine.cpp new file mode 100644 index 0000000000..0025331486 --- /dev/null +++ b/core/fxge/dib/cstretchengine.cpp @@ -0,0 +1,830 @@ +// 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 "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" + +CStretchEngine::CWeightTable::CWeightTable() + : m_DestMin(0), + m_ItemSize(0), + m_pWeightTables(nullptr), + m_dwWeightTablesSize(0) {} + +CStretchEngine::CWeightTable::~CWeightTable() { + FX_Free(m_pWeightTables); +} + +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) { + FX_Free(m_pWeightTables); + m_pWeightTables = nullptr; + m_dwWeightTablesSize = 0; + const double scale = (float)src_len / (float)dest_len; + const double base = dest_len < 0 ? (float)(src_len) : 0; + const int ext_size = flags & FXDIB_BICUBIC_INTERPOL ? 3 : 1; + m_ItemSize = sizeof(int) * 2 + + (int)(sizeof(int) * (ceil(fabs((float)scale)) + ext_size)); + m_DestMin = dest_min; + if ((dest_max - dest_min) > (int)((1U << 30) - 4) / m_ItemSize) + return false; + + m_dwWeightTablesSize = (dest_max - dest_min) * m_ItemSize + 4; + m_pWeightTables = FX_TryAlloc(uint8_t, m_dwWeightTablesSize); + if (!m_pWeightTables) + return false; + + if ((flags & FXDIB_NOSMOOTH) != 0 || fabs((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 = (int)floor((float)src_pos - 1.0f / 2); + pixel_weights.m_SrcEnd = (int)floor((float)src_pos + 1.0f / 2); + if (pixel_weights.m_SrcStart < src_min) { + pixel_weights.m_SrcStart = src_min; + } + if (pixel_weights.m_SrcEnd >= src_max) { + 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( + (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 = (int)floor((float)src_pos - 1.0f / 2); + pixel_weights.m_SrcEnd = (int)floor((float)src_pos + 1.0f / 2); + int start = pixel_weights.m_SrcStart - 1; + int end = pixel_weights.m_SrcEnd + 1; + if (start < src_min) { + start = src_min; + } + if (end >= src_max) { + 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; + } + if (pixel_weights.m_SrcEnd >= src_max) { + pixel_weights.m_SrcEnd = src_max - 1; + } + int weight; + weight = FXSYS_round( + (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 { + pixel_weights.m_SrcStart = pixel_weights.m_SrcEnd = + (int)floor((float)src_pos); + if (pixel_weights.m_SrcStart < src_min) { + pixel_weights.m_SrcStart = src_min; + } + if (pixel_weights.m_SrcEnd >= src_max) { + pixel_weights.m_SrcEnd = 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, end_i; + if (src_start < src_end) { + start_i = (int)floor((float)src_start); + end_i = (int)ceil((float)src_end); + } else { + start_i = (int)floor((float)src_end); + end_i = (int)ceil((float)src_start); + } + if (start_i < src_min) { + start_i = src_min; + } + if (end_i >= src_max) { + end_i = src_max - 1; + } + if (start_i > end_i) { + if (start_i >= src_max) { + 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 = ((float)j - base) / scale; + double dest_end = ((float)(j + 1) - base) / scale; + if (dest_start > dest_end) { + double temp = dest_start; + dest_start = dest_end; + dest_end = temp; + } + double area_start = + dest_start > (float)(dest_pixel) ? dest_start : (float)(dest_pixel); + double area_end = dest_end > (float)(dest_pixel + 1) + ? (float)(dest_pixel + 1) + : dest_end; + double weight = area_start >= area_end ? 0.0f : 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((float)(weight * 65536)); + } + } + return true; +} + +PixelWeight* CStretchEngine::CWeightTable::GetPixelWeight(int pixel) const { + ASSERT(pixel >= m_DestMin); + return reinterpret_cast<PixelWeight*>(m_pWeightTables + + (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 CFX_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_pInterBuf = nullptr; + m_pExtraAlphaBuf = nullptr; + m_pDestMaskScanline = nullptr; + m_DestClip = clip_rect; + uint32_t size = clip_rect.Width(); + if (size && m_DestBpp > (int)(INT_MAX / size)) { + return; + } + size *= m_DestBpp; + if (size > INT_MAX - 31) { + return; + } + size += 31; + size = size / 32 * 4; + m_pDestScanline = FX_TryAlloc(uint8_t, size); + if (!m_pDestScanline) { + return; + } + if (dest_format == FXDIB_Rgb32) { + memset(m_pDestScanline, 255, size); + } + m_InterPitch = (m_DestClip.Width() * m_DestBpp + 31) / 32 * 4; + m_ExtraMaskPitch = (m_DestClip.Width() * 8 + 31) / 32 * 4; + m_pInterBuf = nullptr; + 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 = (float)m_SrcWidth / (float)m_DestWidth; + double scale_y = (float)m_SrcHeight / (float)m_DestHeight; + double base_x = m_DestWidth > 0 ? 0.0f : (float)(m_DestWidth); + double base_y = m_DestHeight > 0 ? 0.0f : (float)(m_DestHeight); + double src_left = scale_x * ((float)(clip_rect.left) + base_x); + double src_right = scale_x * ((float)(clip_rect.right) + base_x); + double src_top = scale_y * ((float)(clip_rect.top) + base_y); + double src_bottom = scale_y * ((float)(clip_rect.bottom) + base_y); + if (src_left > src_right) { + double temp = src_left; + src_left = src_right; + src_right = temp; + } + if (src_top > src_bottom) { + double temp = src_top; + src_top = src_bottom; + src_bottom = temp; + } + m_SrcClip.left = (int)floor((float)src_left); + m_SrcClip.right = (int)ceil((float)src_right); + m_SrcClip.top = (int)floor((float)src_top); + m_SrcClip.bottom = (int)ceil((float)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() { + FX_Free(m_pDestScanline); + FX_Free(m_pInterBuf); + FX_Free(m_pExtraAlphaBuf); + FX_Free(m_pDestMaskScanline); +} + +bool CStretchEngine::Continue(IFX_Pause* 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_pDestScanline) + return false; + + if (m_SrcClip.Height() == 0 || + m_SrcClip.Height() > (1 << 29) / m_InterPitch) { + return false; + } + + m_pInterBuf = FX_TryAlloc(unsigned char, m_SrcClip.Height() * m_InterPitch); + if (!m_pInterBuf) + return false; + + if (m_pSource && m_bHasAlpha && m_pSource->m_pAlphaMask) { + m_pExtraAlphaBuf = + FX_Alloc2D(unsigned char, m_SrcClip.Height(), m_ExtraMaskPitch); + uint32_t size = (m_DestClip.Width() * 8 + 31) / 32 * 4; + m_pDestMaskScanline = FX_TryAlloc(unsigned char, size); + if (!m_pDestMaskScanline) + return false; + } + 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_Pause* 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_pInterBuf + (m_CurRow - m_SrcClip.top) * m_InterPitch; + const uint8_t* src_scan_mask = nullptr; + uint8_t* dest_scan_mask = nullptr; + if (m_pExtraAlphaBuf) { + src_scan_mask = m_pSource->m_pAlphaMask->GetScanline(m_CurRow); + dest_scan_mask = + m_pExtraAlphaBuf + (m_CurRow - m_SrcClip.top) * m_ExtraMaskPitch; + } + switch (m_TransMethod) { + case 1: + case 2: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_a = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a; + } + *dest_scan++ = (uint8_t)(dest_a >> 16); + } + break; + } + case 3: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_a = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, j); + if (!pWeight) + return false; + + int pixel_weight = *pWeight; + dest_a += pixel_weight * src_scan[j]; + } + if (m_Flags & FXDIB_BICUBIC_INTERPOL) { + dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a; + } + *dest_scan++ = (uint8_t)(dest_a >> 16); + } + break; + } + case 4: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_a = 0, dest_r = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 = dest_r < 0 ? 0 : dest_r > 16711680 ? 16711680 : dest_r; + dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a; + } + *dest_scan++ = (uint8_t)(dest_r >> 16); + *dest_scan_mask++ = (uint8_t)((dest_a * 255) >> 16); + } + break; + } + case 5: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 * (uint8_t)(argb_cmyk >> 16); + dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 8); + dest_b_c += pixel_weight * (uint8_t)argb_cmyk; + } else { + dest_b_c += pixel_weight * (uint8_t)(argb_cmyk >> 24); + dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 16); + dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 8); + } + } + if (m_Flags & FXDIB_BICUBIC_INTERPOL) { + dest_r_y = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_b_c = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + } + *dest_scan++ = (uint8_t)(dest_b_c >> 16); + *dest_scan++ = (uint8_t)(dest_g_m >> 16); + *dest_scan++ = (uint8_t)(dest_r_y >> 16); + } + break; + } + case 6: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 * (uint8_t)(argb_cmyk >> 16); + dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 8); + dest_b_c += pixel_weight * (uint8_t)argb_cmyk; + } else { + dest_b_c += pixel_weight * (uint8_t)(argb_cmyk >> 24); + dest_g_m += pixel_weight * (uint8_t)(argb_cmyk >> 16); + dest_r_y += pixel_weight * (uint8_t)(argb_cmyk >> 8); + } + dest_a += pixel_weight; + } + if (m_Flags & FXDIB_BICUBIC_INTERPOL) { + dest_b_c = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_r_y = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a; + } + *dest_scan++ = (uint8_t)(dest_b_c >> 16); + *dest_scan++ = (uint8_t)(dest_g_m >> 16); + *dest_scan++ = (uint8_t)(dest_r_y >> 16); + *dest_scan_mask++ = (uint8_t)((dest_a * 255) >> 16); + } + break; + } + case 7: { + for (int col = m_DestClip.left; col < m_DestClip.right; col++) { + PixelWeight* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_r_y = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + } + *dest_scan++ = (uint8_t)((dest_b_c) >> 16); + *dest_scan++ = (uint8_t)((dest_g_m) >> 16); + *dest_scan++ = (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* pPixelWeights = m_WeightTable.GetPixelWeight(col); + int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = + m_WeightTable.GetValueFromPixelWeight(pPixelWeights, 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 = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_b_c = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + dest_a = dest_a < 0 ? 0 : dest_a > 65536 ? 65536 : dest_a; + } + *dest_scan++ = (uint8_t)((dest_b_c) >> 16); + *dest_scan++ = (uint8_t)((dest_g_m) >> 16); + *dest_scan++ = (uint8_t)((dest_r_y) >> 16); + if (m_DestFormat == FXDIB_Argb) { + *dest_scan = (uint8_t)((dest_a * 255) >> 16); + } + if (dest_scan_mask) { + *dest_scan_mask++ = (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_pDestScanline; + unsigned char* dest_scan_mask = m_pDestMaskScanline; + PixelWeight* pPixelWeights = 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_pInterBuf + (col - m_DestClip.left) * DestBpp; + int dest_a = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, 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 = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a; + } + *dest_scan = (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_pInterBuf + (col - m_DestClip.left) * DestBpp; + unsigned char* src_scan_mask = + m_pExtraAlphaBuf + (col - m_DestClip.left); + int dest_a = 0, dest_k = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, 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 = dest_k < 0 ? 0 : dest_k > 16711680 ? 16711680 : dest_k; + dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a; + } + *dest_scan = (uint8_t)(dest_k >> 16); + dest_scan += DestBpp; + *dest_scan_mask++ = (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_pInterBuf + (col - m_DestClip.left) * DestBpp; + int dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, 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 = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_b_c = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + } + dest_scan[0] = (uint8_t)((dest_b_c) >> 16); + dest_scan[1] = (uint8_t)((dest_g_m) >> 16); + dest_scan[2] = (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_pInterBuf + (col - m_DestClip.left) * DestBpp; + unsigned char* src_scan_mask = nullptr; + if (m_DestFormat != FXDIB_Argb) { + src_scan_mask = m_pExtraAlphaBuf + (col - m_DestClip.left); + } + int dest_a = 0, dest_r_y = 0, dest_g_m = 0, dest_b_c = 0; + for (int j = pPixelWeights->m_SrcStart; j <= pPixelWeights->m_SrcEnd; + j++) { + int* pWeight = table.GetValueFromPixelWeight(pPixelWeights, 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 = + dest_r_y < 0 ? 0 : dest_r_y > 16711680 ? 16711680 : dest_r_y; + dest_g_m = + dest_g_m < 0 ? 0 : dest_g_m > 16711680 ? 16711680 : dest_g_m; + dest_b_c = + dest_b_c < 0 ? 0 : dest_b_c > 16711680 ? 16711680 : dest_b_c; + dest_a = dest_a < 0 ? 0 : dest_a > 16711680 ? 16711680 : dest_a; + } + if (dest_a) { + int r = ((uint32_t)dest_r_y) * 255 / dest_a; + int g = ((uint32_t)dest_g_m) * 255 / dest_a; + int b = ((uint32_t)dest_b_c) * 255 / dest_a; + dest_scan[0] = b > 255 ? 255 : b < 0 ? 0 : b; + dest_scan[1] = g > 255 ? 255 : g < 0 ? 0 : g; + dest_scan[2] = r > 255 ? 255 : r < 0 ? 0 : r; + } + if (m_DestFormat == FXDIB_Argb) { + dest_scan[3] = (uint8_t)((dest_a) >> 16); + } else { + *dest_scan_mask = (uint8_t)((dest_a) >> 16); + } + dest_scan += DestBpp; + if (dest_scan_mask) { + dest_scan_mask++; + } + } + break; + } + } + m_pDestBitmap->ComposeScanline(row - m_DestClip.top, m_pDestScanline, + m_pDestMaskScanline); + } +} |