--- /dev/null
+/*
+ * libeg/load_bmp.c
+ * Loading function for BMP images
+ *
+ * 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"
+
+// BMP structures
+
+#pragma pack(1)
+
+typedef struct {
+ UINT8 Blue;
+ UINT8 Green;
+ UINT8 Red;
+ UINT8 Reserved;
+} BMP_COLOR_MAP;
+
+typedef struct {
+ CHAR8 CharB;
+ CHAR8 CharM;
+ UINT32 Size;
+ UINT16 Reserved[2];
+ UINT32 ImageOffset;
+ UINT32 HeaderSize;
+ UINT32 PixelWidth;
+ UINT32 PixelHeight;
+ UINT16 Planes; // Must be 1
+ UINT16 BitPerPixel; // 1, 4, 8, or 24
+ UINT32 CompressionType;
+ UINT32 ImageSize; // Compressed image size in bytes
+ UINT32 XPixelsPerMeter;
+ UINT32 YPixelsPerMeter;
+ UINT32 NumberOfColors;
+ UINT32 ImportantColors;
+} BMP_IMAGE_HEADER;
+
+#pragma pack()
+
+//
+// Load BMP image
+//
+
+EG_IMAGE * egDecodeBMP(IN UINT8 *FileData, IN UINTN FileDataLength, IN UINTN IconSize, IN BOOLEAN WantAlpha)
+{
+ EG_IMAGE *NewImage;
+ BMP_IMAGE_HEADER *BmpHeader;
+ BMP_COLOR_MAP *BmpColorMap;
+ UINTN x, y;
+ UINT8 *ImagePtr;
+ UINT8 *ImagePtrBase;
+ UINTN ImageLineOffset;
+ UINT8 ImageValue = 0, AlphaValue;
+ EG_PIXEL *PixelPtr;
+ UINTN Index, BitIndex;
+
+ // read and check header
+ if (FileDataLength < sizeof(BMP_IMAGE_HEADER) || FileData == NULL)
+ return NULL;
+ BmpHeader = (BMP_IMAGE_HEADER *) FileData;
+ if (BmpHeader->CharB != 'B' || BmpHeader->CharM != 'M')
+ return NULL;
+ if (BmpHeader->CompressionType != 0)
+ return NULL;
+ if (BmpHeader->BitPerPixel != 1 && BmpHeader->BitPerPixel != 4 &&
+ BmpHeader->BitPerPixel != 8 && BmpHeader->BitPerPixel != 24)
+ return NULL;
+
+ // calculate parameters
+ ImageLineOffset = BmpHeader->PixelWidth;
+ if (BmpHeader->BitPerPixel == 24)
+ ImageLineOffset *= 3;
+ else if (BmpHeader->BitPerPixel == 1)
+ ImageLineOffset = (ImageLineOffset + 7) >> 3;
+ else if (BmpHeader->BitPerPixel == 4)
+ ImageLineOffset = (ImageLineOffset + 1) >> 1;
+ if ((ImageLineOffset % 4) != 0)
+ ImageLineOffset = ImageLineOffset + (4 - (ImageLineOffset % 4));
+ // check bounds
+ if (BmpHeader->ImageOffset + ImageLineOffset * BmpHeader->PixelHeight > FileDataLength)
+ return NULL;
+
+ // allocate image structure and buffer
+ NewImage = egCreateImage(BmpHeader->PixelWidth, BmpHeader->PixelHeight, WantAlpha);
+ if (NewImage == NULL)
+ return NULL;
+ AlphaValue = WantAlpha ? 255 : 0;
+
+ // convert image
+ BmpColorMap = (BMP_COLOR_MAP *)(FileData + sizeof(BMP_IMAGE_HEADER));
+ ImagePtrBase = FileData + BmpHeader->ImageOffset;
+ for (y = 0; y < BmpHeader->PixelHeight; y++) {
+ ImagePtr = ImagePtrBase;
+ ImagePtrBase += ImageLineOffset;
+ PixelPtr = NewImage->PixelData + (BmpHeader->PixelHeight - 1 - y) * BmpHeader->PixelWidth;
+
+ switch (BmpHeader->BitPerPixel) {
+
+ case 1:
+ for (x = 0; x < BmpHeader->PixelWidth; x++) {
+ BitIndex = x & 0x07;
+ if (BitIndex == 0)
+ ImageValue = *ImagePtr++;
+
+ Index = (ImageValue >> (7 - BitIndex)) & 0x01;
+ PixelPtr->b = BmpColorMap[Index].Blue;
+ PixelPtr->g = BmpColorMap[Index].Green;
+ PixelPtr->r = BmpColorMap[Index].Red;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+ }
+ break;
+
+ case 4:
+ for (x = 0; x <= BmpHeader->PixelWidth - 2; x += 2) {
+ ImageValue = *ImagePtr++;
+
+ Index = ImageValue >> 4;
+ PixelPtr->b = BmpColorMap[Index].Blue;
+ PixelPtr->g = BmpColorMap[Index].Green;
+ PixelPtr->r = BmpColorMap[Index].Red;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+
+ Index = ImageValue & 0x0f;
+ PixelPtr->b = BmpColorMap[Index].Blue;
+ PixelPtr->g = BmpColorMap[Index].Green;
+ PixelPtr->r = BmpColorMap[Index].Red;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+ }
+ if (x < BmpHeader->PixelWidth) {
+ ImageValue = *ImagePtr++;
+
+ Index = ImageValue >> 4;
+ PixelPtr->b = BmpColorMap[Index].Blue;
+ PixelPtr->g = BmpColorMap[Index].Green;
+ PixelPtr->r = BmpColorMap[Index].Red;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+ }
+ break;
+
+ case 8:
+ for (x = 0; x < BmpHeader->PixelWidth; x++) {
+ Index = *ImagePtr++;
+ PixelPtr->b = BmpColorMap[Index].Blue;
+ PixelPtr->g = BmpColorMap[Index].Green;
+ PixelPtr->r = BmpColorMap[Index].Red;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+ }
+ break;
+
+ case 24:
+ for (x = 0; x < BmpHeader->PixelWidth; x++) {
+ PixelPtr->b = *ImagePtr++;
+ PixelPtr->g = *ImagePtr++;
+ PixelPtr->r = *ImagePtr++;
+ PixelPtr->a = AlphaValue;
+ PixelPtr++;
+ }
+ break;
+
+ }
+ }
+
+ return NewImage;
+}
+
+//
+// Save BMP image
+//
+
+VOID egEncodeBMP(IN EG_IMAGE *Image, OUT UINT8 **FileDataReturn, OUT UINTN *FileDataLengthReturn)
+{
+ BMP_IMAGE_HEADER *BmpHeader;
+ UINT8 *FileData;
+ UINTN FileDataLength;
+ UINT8 *ImagePtr;
+ UINT8 *ImagePtrBase;
+ UINTN ImageLineOffset;
+ EG_PIXEL *PixelPtr;
+ UINTN x, y;
+
+ ImageLineOffset = Image->Width * 3;
+ if ((ImageLineOffset % 4) != 0)
+ ImageLineOffset = ImageLineOffset + (4 - (ImageLineOffset % 4));
+
+ // allocate buffer for file data
+ FileDataLength = sizeof(BMP_IMAGE_HEADER) + Image->Height * ImageLineOffset;
+ FileData = AllocateZeroPool(FileDataLength);
+ if (FileData == NULL) {
+ Print(L"Error allocate %d bytes\n", FileDataLength);
+ *FileDataReturn = NULL;
+ *FileDataLengthReturn = 0;
+ return;
+ }
+
+ // fill header
+ BmpHeader = (BMP_IMAGE_HEADER *)FileData;
+ BmpHeader->CharB = 'B';
+ BmpHeader->CharM = 'M';
+ BmpHeader->Size = FileDataLength;
+ BmpHeader->ImageOffset = sizeof(BMP_IMAGE_HEADER);
+ BmpHeader->HeaderSize = 40;
+ BmpHeader->PixelWidth = Image->Width;
+ BmpHeader->PixelHeight = Image->Height;
+ BmpHeader->Planes = 1;
+ BmpHeader->BitPerPixel = 24;
+ BmpHeader->CompressionType = 0;
+ BmpHeader->XPixelsPerMeter = 0xb13;
+ BmpHeader->YPixelsPerMeter = 0xb13;
+
+ // fill pixel buffer
+ ImagePtrBase = FileData + BmpHeader->ImageOffset;
+ for (y = 0; y < Image->Height; y++) {
+ ImagePtr = ImagePtrBase;
+ ImagePtrBase += ImageLineOffset;
+ PixelPtr = Image->PixelData + (Image->Height - 1 - y) * Image->Width;
+
+ for (x = 0; x < Image->Width; x++) {
+ *ImagePtr++ = PixelPtr->b;
+ *ImagePtr++ = PixelPtr->g;
+ *ImagePtr++ = PixelPtr->r;
+ PixelPtr++;
+ }
+ }
+
+ *FileDataReturn = FileData;
+ *FileDataLengthReturn = FileDataLength;
+}
+
+/* EOF */