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CloverBootloader/rEFIt_UEFI/libeg/image.cpp
Sergey Isakov 5b02b51273 more type casting fixes 
Signed-off-by: Sergey Isakov <isakov-sl@bk.ru>
2020-02-20 17:28:24 +03:00

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/*
* libeg/image.c
* Image handling functions
*
* Copyright (c) 2006 Christoph Pfisterer
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Christoph Pfisterer nor the names of the
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "libegint.h"
#if defined(LODEPNG)
#include "lodepng.h"
#endif //LODEPNG
#define MAX_FILE_SIZE (1024*1024*1024)
#ifndef DEBUG_ALL
#define DEBUG_IMG 1
#else
#define DEBUG_IMG DEBUG_ALL
#endif
#if DEBUG_IMG == 0
#define DBG(...)
#else
#define DBG(...) DebugLog(DEBUG_IMG, __VA_ARGS__)
#endif
//
// Basic image handling
//
EG_IMAGE * egCreateImage(IN INTN Width, IN INTN Height, IN BOOLEAN HasAlpha)
{
EG_IMAGE *NewImage;
NewImage = (EG_IMAGE *) AllocatePool(sizeof(EG_IMAGE));
if (NewImage == NULL)
return NULL;
if (Width * Height == 0) {
FreePool(NewImage);
return NULL;
}
NewImage->PixelData = (EG_PIXEL *) AllocatePool((UINTN)(Width * Height * sizeof(EG_PIXEL)));
if (NewImage->PixelData == NULL) {
FreePool(NewImage);
return NULL;
}
NewImage->Width = Width;
NewImage->Height = Height;
NewImage->HasAlpha = HasAlpha;
return NewImage;
}
EG_IMAGE * egCreateFilledImage(IN INTN Width, IN INTN Height, IN BOOLEAN HasAlpha, IN EG_PIXEL *Color)
{
EG_IMAGE *NewImage;
NewImage = egCreateImage(Width, Height, HasAlpha);
if (NewImage == NULL)
return NULL;
egFillImage(NewImage, Color);
return NewImage;
}
EG_IMAGE * egCopyImage(IN EG_IMAGE *Image)
{
EG_IMAGE *NewImage;
if (!Image || (Image->Width * Image->Height) == 0) {
return NULL;
}
NewImage = egCreateImage(Image->Width, Image->Height, Image->HasAlpha);
if (NewImage == NULL)
return NULL;
CopyMem(NewImage->PixelData, Image->PixelData, (UINTN)(Image->Width * Image->Height * sizeof(EG_PIXEL)));
return NewImage;
}
//Scaling functions
EG_IMAGE * egCopyScaledImage(IN EG_IMAGE *OldImage, IN INTN Ratio) //will be N/16
{
//(c)Slice 2012
BOOLEAN Grey = FALSE;
EG_IMAGE *NewImage;
INTN x, x0, x1, x2, y, y0, y1, y2;
INTN NewH, NewW;
EG_PIXEL *Dest;
EG_PIXEL *Src;
INTN OldW;
if (Ratio < 0) {
Ratio = -Ratio;
Grey = TRUE;
}
if (!OldImage) {
return NULL;
}
Src = OldImage->PixelData;
OldW = OldImage->Width;
NewW = (OldImage->Width * Ratio) >> 4;
NewH = (OldImage->Height * Ratio) >> 4;
if (Ratio == 16) {
NewImage = egCopyImage(OldImage);
} else {
NewImage = egCreateImage(NewW, NewH, OldImage->HasAlpha);
if (NewImage == NULL)
return NULL;
Dest = NewImage->PixelData;
for (y = 0; y < NewH; y++) {
y1 = (y << 4) / Ratio;
y0 = ((y1 > 0)?(y1-1):y1) * OldW;
y2 = ((y1 < (OldImage->Height - 1))?(y1+1):y1) * OldW;
y1 *= OldW;
for (x = 0; x < NewW; x++) {
x1 = (x << 4) / Ratio;
x0 = (x1 > 0)?(x1-1):x1;
x2 = (x1 < (OldW - 1))?(x1+1):x1;
Dest->b = (UINT8)(((INTN)Src[x1+y1].b * 2 + Src[x0+y1].b +
Src[x2+y1].b + Src[x1+y0].b + Src[x1+y2].b) / 6);
Dest->g = (UINT8)(((INTN)Src[x1+y1].g * 2 + Src[x0+y1].g +
Src[x2+y1].g + Src[x1+y0].g + Src[x1+y2].g) / 6);
Dest->r = (UINT8)(((INTN)Src[x1+y1].r * 2 + Src[x0+y1].r +
Src[x2+y1].r + Src[x1+y0].r + Src[x1+y2].r) / 6);
Dest->a = Src[x1+y1].a;
Dest++;
}
}
}
if (Grey) {
Dest = NewImage->PixelData;
for (y = 0; y < NewH; y++) {
for (x = 0; x < NewW; x++) {
Dest->b = (UINT8)((INTN)((UINTN)Dest->b + (UINTN)Dest->g + (UINTN)Dest->r) / 3);
Dest->g = Dest->r = Dest->b;
Dest++;
}
}
}
return NewImage;
}
BOOLEAN BigDiff(UINT8 a, UINT8 b)
{
if (a > b) {
if (!GlobalConfig.BackgroundDark) {
return (a - b) > (UINT8)(0xFF - GlobalConfig.BackgroundSharp);
}
} else if (GlobalConfig.BackgroundDark) {
return (b - a) > (UINT8)(0xFF - GlobalConfig.BackgroundSharp);
}
return 0;
}
//(c)Slice 2013
#define EDGE(P) \
do { \
if (BigDiff(a11.P, a10.P)) { \
if (!BigDiff(a11.P, a01.P) && !BigDiff(a11.P, a21.P)) { \
a10.P = a11.P; \
} else if (BigDiff(a11.P, a01.P)) { \
if ((dx + dy) < cell) { \
a11.P = a21.P = a12.P = (UINT8)((a10.P * (cell - dy + dx) + a01.P * (cell - dx + dy)) / (cell * 2)); \
} else { \
a10.P = a01.P = a11.P; \
} \
} else if (BigDiff(a11.P, a21.P)) { \
if (dx > dy) { \
a11.P = a01.P = a12.P = (UINT8)((a10.P * (cell * 2 - dy - dx) + a21.P * (dx + dy)) / (cell * 2)); \
}else { \
a10.P = a21.P = a11.P; \
} \
} \
} else if (BigDiff(a11.P, a21.P)) { \
if (!BigDiff(a11.P, a12.P)){ \
a21.P = a11.P; \
} else { \
if ((dx + dy) > cell) { \
a11.P = a01.P = a10.P = (UINT8)((a21.P * (cell + dx - dy) + a12.P * (cell - dx + dy)) / (cell * 2)); \
} else { \
a21.P = a12.P = a11.P; \
} \
} \
} else if (BigDiff(a11.P, a01.P)) { \
if (!BigDiff(a11.P, a12.P)){ \
a01.P = a11.P; \
} else { \
if (dx < dy) { \
a11.P = a21.P = a10.P = (UINT8)((a01.P * (cell * 2 - dx - dy) + a12.P * (dy + dx )) / (cell * 2)); \
} else { \
a01.P = a12.P = a11.P; \
} \
} \
} else if (BigDiff(a11.P, a12.P)) { \
a12.P = a11.P; \
} \
} while(0)
#define SMOOTH(P) \
do { \
norm = (INTN)a01.P + a10.P + 4 * a11.P + a12.P + a21.P; \
if (norm == 0) { \
Dest->P = 0; \
} else { \
Dest->P = (UINT8)(a11.P * 2 * (a01.P * (cell - dx) + a10.P * (cell - dy) + \
a21.P * dx + a12.P * dy + a11.P * 2 * cell) / (cell * norm)); \
} \
} while(0)
#define SMOOTH2(P) \
do { \
Dest->P = (UINT8)((a01.P * (cell - dx) * 3 + a10.P * (cell - dy) * 3 + \
a21.P * dx * 3 + a12.P * dy * 3 + a11.P * 2 * cell) / (cell * 8)); \
} while(0)
VOID ScaleImage(OUT EG_IMAGE *NewImage, IN EG_IMAGE *OldImage)
{
INTN W1, W2, H1, H2, i, j, f, cell;
INTN x, dx, y, y1, dy; //, norm;
EG_PIXEL a10, a11, a12, a01, a21;
EG_PIXEL *Src = OldImage->PixelData;
EG_PIXEL *Dest = NewImage->PixelData;
W1 = OldImage->Width;
H1 = OldImage->Height;
W2 = NewImage->Width;
H2 = NewImage->Height;
if (H1 * W2 < H2 * W1) {
f = (H2 << 12) / H1;
} else {
f = (W2 << 12) / W1;
}
if (f == 0) return;
cell = ((f - 1) >> 12) + 1;
for (j = 0; j < H2; j++) {
y = (j << 12) / f;
y1 = y * W1;
dy = j - ((y * f) >> 12);
for (i = 0; i < W2; i++) {
x = (i << 12) / f;
dx = i - ((x * f) >> 12);
a11 = Src[x + y1];
a10 = (y == 0)?a11: Src[x + y1 - W1];
a01 = (x == 0)?a11: Src[x + y1 - 1];
a21 = (x >= W1)?a11: Src[x + y1 + 1];
a12 = (y >= H1)?a11: Src[x + y1 + W1];
if (a11.a == 0) {
Dest->r = Dest->g = Dest->b = 0x55;
} else {
EDGE(r);
EDGE(g);
EDGE(b);
SMOOTH2(r);
SMOOTH2(g);
SMOOTH2(b);
}
Dest->a = 0xFF;
Dest++;
}
}
}
//
VOID egFreeImage(IN EG_IMAGE *Image)
{
if (Image != NULL) {
if (Image->PixelData != NULL) {
FreePool(Image->PixelData);
Image->PixelData = NULL; //FreePool will not zero pointer
}
FreePool(Image);
}
}
//
// Basic file operations
//
EFI_STATUS egLoadFile(IN EFI_FILE_HANDLE BaseDir, IN CONST CHAR16 *FileName,
OUT UINT8 **FileData, OUT UINTN *FileDataLength)
{
EFI_STATUS Status = EFI_NOT_FOUND;
EFI_FILE_HANDLE FileHandle = 0;
EFI_FILE_INFO *FileInfo;
UINT64 ReadSize;
UINTN BufferSize;
UINT8 *Buffer;
if (!BaseDir) {
goto Error;
}
Status = BaseDir->Open(BaseDir, &FileHandle, (CHAR16*)FileName, EFI_FILE_MODE_READ, 0); // const missing in EFI_FILE_HANDLE->Open
if (EFI_ERROR(Status) || !FileHandle) {
goto Error;
}
FileInfo = EfiLibFileInfo(FileHandle);
if (FileInfo == NULL) {
FileHandle->Close(FileHandle);
goto Error;
}
ReadSize = FileInfo->FileSize;
if (ReadSize > MAX_FILE_SIZE)
ReadSize = MAX_FILE_SIZE;
FreePool(FileInfo);
BufferSize = (UINTN)ReadSize; // was limited to 1 GB above, so this is safe
Buffer = (UINT8 *) AllocatePool (BufferSize);
if (Buffer == NULL) {
FileHandle->Close(FileHandle);
Status = EFI_OUT_OF_RESOURCES;
goto Error;
}
Status = FileHandle->Read(FileHandle, &BufferSize, Buffer);
FileHandle->Close(FileHandle);
if (EFI_ERROR(Status)) {
FreePool(Buffer);
goto Error;
}
if(FileData) {
*FileData = Buffer;
}
if (FileDataLength) {
*FileDataLength = BufferSize;
}
return Status;
Error:
if (FileData) {
*FileData = NULL;
}
if (FileDataLength) {
*FileDataLength = 0;
}
return Status;
}
//Slice - this is gEfiPartTypeSystemPartGuid
//static EFI_GUID ESPGuid = { 0xc12a7328, 0xf81f, 0x11d2, { 0xba, 0x4b, 0x00, 0xa0, 0xc9, 0x3e, 0xc9, 0x3b } };
//there is assumed only one ESP partition. What if there are two HDD gpt formatted?
EFI_STATUS egFindESP(OUT EFI_FILE_HANDLE *RootDir)
{
EFI_STATUS Status;
UINTN HandleCount = 0;
EFI_HANDLE *Handles;
Status = gBS->LocateHandleBuffer(ByProtocol, &gEfiPartTypeSystemPartGuid, NULL, &HandleCount, &Handles);
if (!EFI_ERROR(Status) && HandleCount > 0) {
*RootDir = EfiLibOpenRoot(Handles[0]);
if (*RootDir == NULL)
Status = EFI_NOT_FOUND;
FreePool(Handles);
}
return Status;
}
//if (NULL, ...) then save to EFI partition
EFI_STATUS egSaveFile(IN EFI_FILE_HANDLE BaseDir OPTIONAL, IN CONST CHAR16 *FileName,
IN CONST VOID *FileData, IN UINTN FileDataLength)
{
EFI_STATUS Status;
EFI_FILE_HANDLE FileHandle;
UINTN BufferSize;
BOOLEAN CreateNew = TRUE;
CONST CHAR16 *p = FileName + StrLen(FileName);
CHAR16 DirName[256];
UINTN dirNameLen;
if (BaseDir == NULL) {
Status = egFindESP(&BaseDir);
if (EFI_ERROR(Status)) {
DBG("no ESP %r\n", Status);
return Status;
}
}
// syscl - make directory if not exist
while (*p != L'\\' && p >= FileName) {
// find the first '\\' traverse from the end to head of FileName
p -= 1;
}
dirNameLen = p - FileName;
StrnCpy(DirName, FileName, dirNameLen);
Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, EFI_FILE_DIRECTORY);
if (EFI_ERROR(Status)) {
// make dir
// DBG("no dir %r\n", Status);
Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, EFI_FILE_DIRECTORY);
// DBG("cant make dir %r\n", Status);
}
// end of folder checking
// Delete existing file if it exists
Status = BaseDir->Open(BaseDir, &FileHandle, (CHAR16*)FileName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, 0);
if (!EFI_ERROR(Status)) {
Status = FileHandle->Delete(FileHandle);
if (Status == EFI_WARN_DELETE_FAILURE) {
//This is READ_ONLY file system
CreateNew = FALSE; // will write into existing file
// DBG("RO FS %r\n", Status);
}
}
if (CreateNew) {
// Write new file
Status = BaseDir->Open(BaseDir, &FileHandle, (CHAR16*)FileName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, 0);
if (EFI_ERROR(Status)) {
// DBG("no write %r\n", Status);
return Status;
}
} else {
//to write into existing file we must sure it size larger then our data
EFI_FILE_INFO *Info = EfiLibFileInfo(FileHandle);
if (Info) {
if (Info->FileSize < FileDataLength) {
// DBG("no old file %r\n", Status);
return EFI_NOT_FOUND;
}
FreePool(Info);
}
}
if (!FileHandle) {
// DBG("no FileHandle %r\n", Status);
return EFI_DEVICE_ERROR;
}
BufferSize = FileDataLength;
Status = FileHandle->Write(FileHandle, &BufferSize, (VOID*)FileData); // CONST missing in EFI_FILE_HANDLE->write
FileHandle->Close(FileHandle);
// DBG("not written %r\n", Status);
return Status;
}
EFI_STATUS egMkDir(IN EFI_FILE_HANDLE BaseDir OPTIONAL, IN CHAR16 *DirName)
{
EFI_STATUS Status;
EFI_FILE_HANDLE FileHandle;
//DBG("Looking up dir assets (%s):", DirName);
if (BaseDir == NULL) {
Status = egFindESP(&BaseDir);
if (EFI_ERROR(Status)) {
//DBG(" %r\n", Status);
return Status;
}
}
Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, EFI_FILE_DIRECTORY);
if (EFI_ERROR(Status)) {
// Write new dir
//DBG("%r, attempt to create one:", Status);
Status = BaseDir->Open(BaseDir, &FileHandle, DirName,
EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, EFI_FILE_DIRECTORY);
}
//DBG(" %r\n", Status);
return Status;
}
//caller is responsible for free image
EG_IMAGE * egLoadImage(IN EFI_FILE_HANDLE BaseDir, IN CONST CHAR16 *FileName, IN BOOLEAN WantAlpha)
{
EFI_STATUS Status;
UINT8 *FileData = NULL;
UINTN FileDataLength = 0;
EG_IMAGE *NewImage;
if (GlobalConfig.TypeSVG) {
return NULL;
}
if (BaseDir == NULL || FileName == NULL)
return NULL;
// load file
Status = egLoadFile(BaseDir, FileName, &FileData, &FileDataLength);
if (EFI_ERROR(Status))
return NULL;
// decode it
NewImage = egDecodePNG(FileData, FileDataLength, WantAlpha);
if (!NewImage) {
DBG("%s not decoded\n", FileName);
}
FreePool(FileData);
return NewImage;
}
//caller is responsible for free image
EG_IMAGE * egLoadIcon(IN EFI_FILE_HANDLE BaseDir, IN CONST CHAR16 *FileName, IN UINTN IconSize)
{
EFI_STATUS Status;
UINT8 *FileData;
UINTN FileDataLength;
EG_IMAGE *NewImage;
CHAR8 *IconName;
if (!BaseDir || !FileName) {
return NULL;
}
if (GlobalConfig.TypeSVG) {
INTN i = 0;
UINTN Size;
CONST CHAR16 *ptr = StrStr(FileName, L"\\");
if (!ptr) {
ptr = FileName;
} else {
ptr++;
}
CONST CHAR16 *ptr2 = StrStr(ptr, L".");
Size = ptr2 - ptr + 2;
IconName = (__typeof__(IconName))AllocateZeroPool(Size);
UnicodeStrToAsciiStrS(ptr, IconName, Size - 1);
while (OSIconsTable[i].name) {
if (AsciiStrCmp(OSIconsTable[i].name, IconName) == 0) {
// DBG("theme defined %a\n", IconName);
// DBG(" icon size=[%d,%d]\n", OSIconsTable[i].image->Width, OSIconsTable[i].image->Height);
FreePool(IconName);
return OSIconsTable[i].image;
}
i++;
}
FreePool(IconName);
return NULL;
}
// load file
Status = egLoadFile(BaseDir, FileName, &FileData, &FileDataLength);
if (EFI_ERROR(Status)) {
return NULL;
}
// decode it
NewImage = egDecodePNG(FileData, FileDataLength, TRUE);
if (!NewImage) {
NewImage = egDecodeICNS(FileData, FileDataLength, IconSize, TRUE);
}
FreePool(FileData);
return NewImage;
}
//
// Compositing
//
VOID egRestrictImageArea(IN EG_IMAGE *Image,
IN INTN AreaPosX, IN INTN AreaPosY,
IN OUT INTN *AreaWidth, IN OUT INTN *AreaHeight)
{
if (!Image || !AreaWidth || !AreaHeight) {
return;
}
if (AreaPosX >= Image->Width || AreaPosY >= Image->Height) {
// out of bounds, operation has no effect
*AreaWidth = 0;
*AreaHeight = 0;
} else {
// calculate affected area
if (*AreaWidth > Image->Width - AreaPosX)
*AreaWidth = Image->Width - AreaPosX;
if (*AreaHeight > Image->Height - AreaPosY)
*AreaHeight = Image->Height - AreaPosY;
}
}
VOID egFillImage(IN OUT EG_IMAGE *CompImage, IN EG_PIXEL *Color)
{
INTN i;
EG_PIXEL FillColor;
EG_PIXEL *PixelPtr;
if (!CompImage || !Color) {
return;
}
FillColor = *Color;
if (!CompImage->HasAlpha)
FillColor.a = 0;
PixelPtr = CompImage->PixelData;
for (i = 0; i < CompImage->Width * CompImage->Height; i++) {
*PixelPtr++ = FillColor;
}
}
VOID egFillImageArea(IN OUT EG_IMAGE *CompImage,
IN INTN AreaPosX, IN INTN AreaPosY,
IN INTN AreaWidth, IN INTN AreaHeight,
IN EG_PIXEL *Color)
{
INTN x, y;
INTN xAreaWidth = AreaWidth;
INTN xAreaHeight = AreaHeight;
EG_PIXEL FillColor;
EG_PIXEL *PixelBasePtr;
if (!CompImage || !Color) {
return;
}
egRestrictImageArea(CompImage, AreaPosX, AreaPosY, &xAreaWidth, &xAreaHeight);
if (xAreaWidth > 0) {
FillColor = *Color;
if (!CompImage->HasAlpha)
FillColor.a = 0;
PixelBasePtr = CompImage->PixelData + AreaPosY * CompImage->Width + AreaPosX;
for (y = 0; y < xAreaHeight; y++) {
EG_PIXEL *PixelPtr = PixelBasePtr;
for (x = 0; x < xAreaWidth; x++) {
*PixelPtr++ = FillColor;
}
PixelBasePtr += CompImage->Width;
}
}
}
VOID egRawCopy(IN OUT EG_PIXEL *CompBasePtr, IN EG_PIXEL *TopBasePtr,
IN INTN Width, IN INTN Height,
IN INTN CompLineOffset, IN INTN TopLineOffset)
{
INTN x, y;
if (!CompBasePtr || !TopBasePtr) {
return;
}
for (y = 0; y < Height; y++) {
EG_PIXEL *TopPtr = TopBasePtr;
EG_PIXEL *CompPtr = CompBasePtr;
for (x = 0; x < Width; x++) {
*CompPtr = *TopPtr;
TopPtr++, CompPtr++;
}
TopBasePtr += TopLineOffset;
CompBasePtr += CompLineOffset;
}
}
VOID egRawCompose(IN OUT EG_PIXEL *CompBasePtr, IN EG_PIXEL *TopBasePtr,
IN INTN Width, IN INTN Height,
IN INTN CompLineOffset, IN INTN TopLineOffset)
{
INT64 x, y;
EG_PIXEL *TopPtr, *CompPtr;
//To make native division we need INTN types
INTN TopAlpha;
INTN Alpha;
INTN CompAlpha;
INTN RevAlpha;
INTN TempAlpha;
// EG_PIXEL *CompUp;
if (!CompBasePtr || !TopBasePtr) {
return;
}
// CompUp = CompBasePtr + Width * Height;
//Slice - my opinion
//if TopAlpha=255 then draw Top - non transparent
//else if TopAlpha=0 then draw Comp - full transparent
//else draw mixture |-----comp---|--top--|
//final alpha =(1-(1-x)*(1-y)) =(255*255-(255-topA)*(255-compA))/255
for (y = 0; y < Height; y++) {
TopPtr = TopBasePtr;
CompPtr = CompBasePtr;
for (x = 0; x < Width; x++) {
TopAlpha = TopPtr->a & 0xFF; //exclude sign
if (TopAlpha == 255) {
CompPtr->b = TopPtr->b;
CompPtr->g = TopPtr->g;
CompPtr->r = TopPtr->r;
CompPtr->a = (UINT8)TopAlpha;
} else if (TopAlpha != 0) {
CompAlpha = CompPtr->a & 0xFF;
RevAlpha = 255 - TopAlpha;
TempAlpha = CompAlpha * RevAlpha;
TopAlpha *= 255;
Alpha = TopAlpha + TempAlpha;
CompPtr->b = (UINT8)((TopPtr->b * TopAlpha + CompPtr->b * TempAlpha) / Alpha);
CompPtr->g = (UINT8)((TopPtr->g * TopAlpha + CompPtr->g * TempAlpha) / Alpha);
CompPtr->r = (UINT8)((TopPtr->r * TopAlpha + CompPtr->r * TempAlpha) / Alpha);
CompPtr->a = (UINT8)(Alpha / 255);
}
TopPtr++, CompPtr++;
}
TopBasePtr += TopLineOffset;
CompBasePtr += CompLineOffset;
}
}
// This is simplified image composing on solid background. egComposeImage will decide which method to use
VOID egRawComposeOnFlat(IN OUT EG_PIXEL *CompBasePtr, IN EG_PIXEL *TopBasePtr,
IN INTN Width, IN INTN Height,
IN INTN CompLineOffset, IN INTN TopLineOffset)
{
INT64 x, y;
EG_PIXEL *TopPtr, *CompPtr;
UINT32 TopAlpha;
UINT32 RevAlpha;
UINTN Temp;
if (!CompBasePtr || !TopBasePtr) {
return;
}
for (y = 0; y < Height; y++) {
TopPtr = TopBasePtr;
CompPtr = CompBasePtr;
for (x = 0; x < Width; x++) {
TopAlpha = TopPtr->a;
RevAlpha = 255 - TopAlpha;
Temp = ((UINT8)CompPtr->b * RevAlpha) + ((UINT8)TopPtr->b * TopAlpha);
CompPtr->b = (UINT8)(Temp / 255);
Temp = ((UINT8)CompPtr->g * RevAlpha) + ((UINT8)TopPtr->g * TopAlpha);
CompPtr->g = (UINT8)(Temp / 255);
Temp = ((UINT8)CompPtr->r * RevAlpha) + ((UINT8)TopPtr->r * TopAlpha);
CompPtr->r = (UINT8)(Temp / 255);
CompPtr->a = (UINT8)(255);
TopPtr++, CompPtr++;
}
TopBasePtr += TopLineOffset;
CompBasePtr += CompLineOffset;
}
}
VOID egComposeImage(IN OUT EG_IMAGE *CompImage, IN EG_IMAGE *TopImage, IN INTN PosX, IN INTN PosY)
{
INTN CompWidth, CompHeight;
if (!TopImage || !CompImage) {
return;
}
CompWidth = TopImage->Width;
CompHeight = TopImage->Height;
egRestrictImageArea(CompImage, PosX, PosY, &CompWidth, &CompHeight);
// compose
if (CompWidth > 0) {
if (CompImage->HasAlpha && !BackgroundImage) {
CompImage->HasAlpha = FALSE;
}
if (TopImage->HasAlpha) {
if (CompImage->HasAlpha) { //aaaa
egRawCompose(CompImage->PixelData + PosY * CompImage->Width + PosX,
TopImage->PixelData,
CompWidth, CompHeight, CompImage->Width, TopImage->Width);
} else {
egRawComposeOnFlat(CompImage->PixelData + PosY * CompImage->Width + PosX,
TopImage->PixelData,
CompWidth, CompHeight, CompImage->Width, TopImage->Width);
}
} else {
egRawCopy(CompImage->PixelData + PosY * CompImage->Width + PosX,
TopImage->PixelData,
CompWidth, CompHeight, CompImage->Width, TopImage->Width);
}
}
}
EG_IMAGE * egEnsureImageSize(IN EG_IMAGE *Image, IN INTN Width, IN INTN Height, IN EG_PIXEL *Color)
{
EG_IMAGE *NewImage;
if (Image == NULL)
return NULL;
if (Image->Width == Width && Image->Height == Height)
return Image;
NewImage = egCreateFilledImage(Width, Height, Image->HasAlpha, Color);
if (NewImage == NULL) {
egFreeImage(Image);
return NULL;
}
egComposeImage(NewImage, Image, 0, 0);
egFreeImage(Image);
return NewImage;
}
//
// misc internal functions
//
VOID egInsertPlane(IN UINT8 *SrcDataPtr, IN UINT8 *DestPlanePtr, IN UINTN PixelCount)
{
UINTN i;
if (!SrcDataPtr || !DestPlanePtr) {
return;
}
for (i = 0; i < PixelCount; i++) {
*DestPlanePtr = *SrcDataPtr++;
DestPlanePtr += 4;
}
}
VOID egSetPlane(IN UINT8 *DestPlanePtr, IN UINT8 Value, IN UINT64 PixelCount)
{
UINT64 i;
if (!DestPlanePtr) {
return;
}
for (i = 0; i < PixelCount; i++) {
*DestPlanePtr = Value;
DestPlanePtr += 4;
}
}
VOID egCopyPlane(IN UINT8 *SrcPlanePtr, IN UINT8 *DestPlanePtr, IN UINTN PixelCount)
{
UINTN i;
if (!SrcPlanePtr || !DestPlanePtr) {
return;
}
for (i = 0; i < PixelCount; i++) {
*DestPlanePtr = *SrcPlanePtr;
DestPlanePtr += 4, SrcPlanePtr += 4;
}
}
#if defined(LODEPNG)
EG_IMAGE * egDecodePNG(IN UINT8 *FileData, IN UINTN FileDataLength, IN BOOLEAN WantAlpha) {
EG_IMAGE *NewImage = NULL;
UINTN Error, i, ImageSize, Width, Height;
EG_PIXEL *PixelData;
EG_PIXEL *Pixel, *PixelD;
Error = eglodepng_decode((UINT8**) &PixelData, &Width, &Height, (CONST UINT8*) FileData, (UINTN) FileDataLength);
if (Error) {
/*
* Error 28 incorrect PNG signature ok, because also called on ICNS files
*/
if (Error != 28U) {
DBG("egDecodePNG(%p, %lu, %c): eglodepng_decode failed with error %lu\n",
FileData, FileDataLength, WantAlpha?'Y':'N', Error);
}
return NULL;
}
if (!PixelData || Width > 4096U || Height > 4096U) {
DBG("egDecodePNG(%p, %lu, %c): eglodepng_decode returned suspect values, PixelData %p, Width %lu, Height %lu\n",
FileData, FileDataLength, WantAlpha?'Y':'N', PixelData, Width, Height);
}
NewImage = egCreateImage(Width, Height, WantAlpha);
if (NewImage == NULL) return NULL;
ImageSize = (Width * Height);
// CopyMem(NewImage->PixelData, PixelData, sizeof(EG_PIXEL) * ImageSize);
// lodepng_free(PixelData);
Pixel = (EG_PIXEL*)NewImage->PixelData;
PixelD = PixelData;
for (i = 0; i < ImageSize; i++) {
/* UINT8 Temp;
Temp = Pixel->b;
Pixel->b = Pixel->r;
Pixel->r = Temp; */
Pixel->b = PixelD->r; //change r <-> b
Pixel->r = PixelD->b;
Pixel->g = PixelD->g;
Pixel->a = PixelD->a; // 255 is opaque, 0 - transparent
Pixel++;
PixelD++;
}
lodepng_free(PixelData);
return NewImage;
}
#endif //LODEPNG
/* EOF */
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