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// Copyright 2016 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/fpdfapi/render/cpdf_dibtransferfunc.h"
#include <vector>
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/render/cpdf_transferfunc.h"
CPDF_DIBTransferFunc::CPDF_DIBTransferFunc(
const CPDF_TransferFunc* pTransferFunc) {
m_RampR = pTransferFunc->m_Samples;
m_RampG = &pTransferFunc->m_Samples[256];
m_RampB = &pTransferFunc->m_Samples[512];
}
CPDF_DIBTransferFunc::~CPDF_DIBTransferFunc() {}
FXDIB_Format CPDF_DIBTransferFunc::GetDestFormat() {
if (m_pSrc->IsAlphaMask())
return FXDIB_8bppMask;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb32;
#else
return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb;
#endif
}
FX_ARGB* CPDF_DIBTransferFunc::GetDestPalette() {
return nullptr;
}
void CPDF_DIBTransferFunc::TranslateScanline(
const uint8_t* src_buf,
std::vector<uint8_t>* dest_buf) const {
bool bSkip = false;
switch (m_pSrc->GetFormat()) {
case FXDIB_1bppRgb: {
int r0 = m_RampR[0];
int g0 = m_RampG[0];
int b0 = m_RampB[0];
int r1 = m_RampR[255];
int g1 = m_RampG[255];
int b1 = m_RampB[255];
int index = 0;
for (int i = 0; i < m_Width; i++) {
if (src_buf[i / 8] & (1 << (7 - i % 8))) {
(*dest_buf)[index++] = b1;
(*dest_buf)[index++] = g1;
(*dest_buf)[index++] = r1;
} else {
(*dest_buf)[index++] = b0;
(*dest_buf)[index++] = g0;
(*dest_buf)[index++] = r0;
}
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
index++;
#endif
}
break;
}
case FXDIB_1bppMask: {
int m0 = m_RampR[0];
int m1 = m_RampR[255];
int index = 0;
for (int i = 0; i < m_Width; i++) {
if (src_buf[i / 8] & (1 << (7 - i % 8)))
(*dest_buf)[index++] = m1;
else
(*dest_buf)[index++] = m0;
}
break;
}
case FXDIB_8bppRgb: {
FX_ARGB* pPal = m_pSrc->GetPalette();
int index = 0;
for (int i = 0; i < m_Width; i++) {
if (pPal) {
FX_ARGB src_argb = pPal[*src_buf];
(*dest_buf)[index++] = m_RampB[FXARGB_R(src_argb)];
(*dest_buf)[index++] = m_RampG[FXARGB_G(src_argb)];
(*dest_buf)[index++] = m_RampR[FXARGB_B(src_argb)];
} else {
uint32_t src_byte = *src_buf;
(*dest_buf)[index++] = m_RampB[src_byte];
(*dest_buf)[index++] = m_RampG[src_byte];
(*dest_buf)[index++] = m_RampR[src_byte];
}
src_buf++;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
index++;
#endif
}
break;
}
case FXDIB_8bppMask: {
int index = 0;
for (int i = 0; i < m_Width; i++)
(*dest_buf)[index++] = m_RampR[*(src_buf++)];
break;
}
case FXDIB_Rgb: {
int index = 0;
for (int i = 0; i < m_Width; i++) {
(*dest_buf)[index++] = m_RampB[*(src_buf++)];
(*dest_buf)[index++] = m_RampG[*(src_buf++)];
(*dest_buf)[index++] = m_RampR[*(src_buf++)];
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
index++;
#endif
}
break;
}
case FXDIB_Rgb32:
bSkip = true;
case FXDIB_Argb: {
int index = 0;
for (int i = 0; i < m_Width; i++) {
(*dest_buf)[index++] = m_RampB[*(src_buf++)];
(*dest_buf)[index++] = m_RampG[*(src_buf++)];
(*dest_buf)[index++] = m_RampR[*(src_buf++)];
if (!bSkip) {
(*dest_buf)[index++] = *src_buf;
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
} else {
index++;
#endif
}
src_buf++;
}
break;
}
default:
break;
}
}
void CPDF_DIBTransferFunc::TranslateDownSamples(uint8_t* dest_buf,
const uint8_t* src_buf,
int pixels,
int Bpp) const {
if (Bpp == 8) {
for (int i = 0; i < pixels; i++)
*dest_buf++ = m_RampR[*(src_buf++)];
} else if (Bpp == 24) {
for (int i = 0; i < pixels; i++) {
*dest_buf++ = m_RampB[*(src_buf++)];
*dest_buf++ = m_RampG[*(src_buf++)];
*dest_buf++ = m_RampR[*(src_buf++)];
}
} else {
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
if (!m_pSrc->HasAlpha()) {
for (int i = 0; i < pixels; i++) {
*dest_buf++ = m_RampB[*(src_buf++)];
*dest_buf++ = m_RampG[*(src_buf++)];
*dest_buf++ = m_RampR[*(src_buf++)];
dest_buf++;
src_buf++;
}
} else {
#endif
for (int i = 0; i < pixels; i++) {
*dest_buf++ = m_RampB[*(src_buf++)];
*dest_buf++ = m_RampG[*(src_buf++)];
*dest_buf++ = m_RampR[*(src_buf++)];
*dest_buf++ = *(src_buf++);
}
#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
}
#endif
}
}
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