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bitmap.c
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#include "bitmap.h"
//Min / max:
#define BITMAP_MIN(a, b) (((a) < (b)) ? (a) : (b))
#define BITMAP_MAX(a, b) (((a) > (b)) ? (a) : (b))
//Includes from the standard library:
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//Includes from POSIX:
#include <unistd.h>
//Constants:
#define BITMAP_MAGIC_NUMBER 0x4D42
//The internal representation of a bitmap.
typedef struct {
//The embedded bitmap parameters:
bitmap_parameters_t parameters;
//The file pointer:
FILE* file;
//Where do the pixels start?
uint32_t pixelOffset;
} bitmap_t;
//Internal logging function based on BITMAP_LOGGING.
//This always writes full lines.
void bitmapLog(bitmap_logging_t logging, const char* format, ...)
{
//Check level:
if (BITMAP_LOGGING < logging)
{
return;
}
//Delegate to vprintf:
va_list args;
va_start(args, format);
vprintf(format, args);
printf("\n");
va_end(args);
}
/**********************************************************************************************************************************************************************
Converting pixels
Thanks to http://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both
Do we need FP? Not right now ...
**********************************************************************************************************************************************************************/
bitmap_pixel_rgb_t pixelToRGB(bitmap_pixel_t pixel, bitmap_color_space_t colorSpace)
{
bitmap_pixel_rgb_t newPixel;
switch (colorSpace)
{
case BITMAP_COLOR_SPACE_HSV:
{
newPixel.c3 = pixel.c3;
if (pixel.c1 == 0)
{
newPixel.r = pixel.c2;
newPixel.g = pixel.c2;
newPixel.b = pixel.c2;
break;
}
bitmap_component_t region = pixel.c0 / 43;
bitmap_component_t remainder = (pixel.c0 - (region * 43)) * 6;
bitmap_component_t p = (pixel.c2 * (255 - pixel.c1)) >> 8;
bitmap_component_t q = (pixel.c2 * (255 - ((pixel.c1 * remainder) >> 8))) >> 8;
bitmap_component_t t = (pixel.c2 * (255 - ((pixel.c1 * (255 - remainder)) >> 8))) >> 8;
switch (region)
{
case 0:
newPixel.r = pixel.c2;
newPixel.g = t;
newPixel.b = p;
break;
case 1:
newPixel.r = q;
newPixel.g = pixel.c2;
newPixel.b = p;
break;
case 2:
newPixel.r = p;
newPixel.g = pixel.c2;
newPixel.b = t;
break;
case 3:
newPixel.r = p;
newPixel.g = q;
newPixel.b = pixel.c2;
break;
case 4:
newPixel.r = t;
newPixel.g = p;
newPixel.b = pixel.c2;
break;
default:
newPixel.r = pixel.c2;
newPixel.g = p;
newPixel.b = q;
}
break;
}
default:
//RGB:
newPixel.r = pixel.c0;
newPixel.g = pixel.c1;
newPixel.b = pixel.c2;
newPixel.c3 = pixel.c3;
}
return newPixel;
}
bitmap_pixel_t rgbToPixel(bitmap_pixel_rgb_t pixel, bitmap_color_space_t colorSpace)
{
bitmap_pixel_t newPixel;
switch (colorSpace)
{
case BITMAP_COLOR_SPACE_HSV:
{
newPixel.c3 = pixel.c3;
bitmap_component_t rgbMin = BITMAP_MIN(pixel.r, BITMAP_MIN(pixel.g, pixel.b));
bitmap_component_t rgbMax = BITMAP_MAX(pixel.r, BITMAP_MAX(pixel.g, pixel.b));
newPixel.c2 = rgbMax;
if (newPixel.c2 == 0)
{
newPixel.c0 = 0;
newPixel.c1 = 0;
break;
}
newPixel.c1 = (bitmap_component_t)((255 * (uint16_t)(rgbMax - rgbMin)) / rgbMax);
if (newPixel.c1 == 0)
{
newPixel.c0 = 0;
break;
}
if (rgbMax == pixel.r)
newPixel.c0 = 0 + ((43 * (pixel.g - pixel.b)) / (rgbMax - rgbMin));
else if (rgbMax == pixel.g)
newPixel.c0 = 85 + ((43 * (pixel.b - pixel.r)) / (rgbMax - rgbMin));
else
newPixel.c0 = 171 + ((43 * (pixel.r - pixel.g)) / (rgbMax - rgbMin));
break;
}
default:
//RGB:
newPixel.c0 = pixel.r;
newPixel.c1 = pixel.g;
newPixel.c2 = pixel.b;
newPixel.c3 = pixel.c3;
}
return newPixel;
}
/**********************************************************************************************************************************************************************
Reading
**********************************************************************************************************************************************************************/
//Internal reading function.
//Always reads "count" bytes.
//
//Errors:
//
//- BITMAP_ERROR_IO A read error has occurred. Includes unexpected EOF.
//
//The file will not be closed by this function.
bitmap_error_t bitmapReadBytes(FILE* file, uint8_t* buffer, size_t count)
{
if (fread(buffer, 1, count, file) != count)
{
if (feof(file))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Failed to read bytes: Unexpected end of file.");
return BITMAP_ERROR_IO;
}
int err = ferror(file);
if (err)
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Failed to read bytes: IO error (%d).", err);
return BITMAP_ERROR_IO;
}
bitmapLog(BITMAP_LOGGING_DEFAULT, "Failed to read bytes: Unknown IO error.");
return BITMAP_ERROR_IO;
}
return BITMAP_ERROR_SUCCESS;
}
//Some typed functions with the same behavior:
bitmap_error_t bitmapReadU8(FILE* file, uint8_t* value)
{
return bitmapReadBytes(file, value, sizeof(uint8_t));
}
bitmap_error_t bitmapReadI8(FILE* file, int8_t* value)
{
return bitmapReadBytes(file, (uint8_t*)value, sizeof(int8_t));
}
bitmap_error_t bitmapReadU16(FILE* file, uint16_t* value)
{
return bitmapReadBytes(file, (uint8_t*)value, sizeof(uint16_t));
}
bitmap_error_t bitmapReadI16(FILE* file, int16_t* value)
{
return bitmapReadBytes(file, (uint8_t*)value, sizeof(int16_t));
}
bitmap_error_t bitmapReadU32(FILE* file, uint32_t* value)
{
return bitmapReadBytes(file, (uint8_t*)value, sizeof(uint32_t));
}
bitmap_error_t bitmapReadI32(FILE* file, int32_t* value)
{
return bitmapReadBytes(file, (uint8_t*)value, sizeof(int32_t));
}
//Internal pixel row read function (BITMAP_COLOR_DEPTH_1).
//The buffers will not be released by this function.
void bitmapReadRowColorDepth_1(bitmap_t* bitmap, const uint8_t* rowData, bitmap_pixel_t* outputData, uint32_t rowPx)
{
uint32_t widthPx = bitmap->parameters.widthPx;
uint32_t pixelsRead = 0;
size_t baseIndex = rowPx * widthPx;
do
{
uint32_t pixelsToRead = widthPx - pixelsRead;
if (pixelsToRead > 8)
{
pixelsToRead = 8;
}
uint8_t currByte = rowData[pixelsRead / 8];
for (uint32_t i = 0; i < pixelsToRead; i++)
{
outputData[baseIndex + pixelsRead + i] = (currByte & (1 << (7 - i))) ? bitmap->parameters.colorTable[1] : bitmap->parameters.colorTable[0];
}
pixelsRead += pixelsToRead;
} while (pixelsRead < widthPx);
}
//Internal pixel row read function (BITMAP_COLOR_DEPTH_8).
//The buffers will not be released by this function.
void bitmapReadRowColorDepth_8(bitmap_t* bitmap, const uint8_t* rowData, bitmap_pixel_t* outputData, uint32_t rowPx)
{
uint32_t widthPx = bitmap->parameters.widthPx;
size_t baseIndex = rowPx * widthPx;
for (uint32_t colPx = 0; colPx < widthPx; colPx++)
{
outputData[baseIndex + colPx] = bitmap->parameters.colorTable[rowData[colPx]];
}
}
//Internal pixel row read function (BITMAP_COLOR_DEPTH_24).
//The buffers will not be released by this function.
void bitmapReadRowColorDepth_24(bitmap_t* bitmap, const uint8_t* rowData, bitmap_pixel_t* outputData, uint32_t rowPx)
{
uint32_t widthPx = bitmap->parameters.widthPx;
bitmap_color_space_t colorSpace = bitmap->parameters.colorSpace;
size_t baseIndex = rowPx * widthPx;
for (uint32_t colPx = 0; colPx < widthPx; colPx++)
{
bitmap_pixel_rgb_t currPixel;
currPixel.r = rowData[(3 * colPx) + 2];
currPixel.g = rowData[(3 * colPx) + 1];
currPixel.b = rowData[(3 * colPx) + 0];
currPixel.c3 = 0x00;
outputData[baseIndex + colPx] = rgbToPixel(currPixel, colorSpace);
}
}
//Internal pixel row read function (BITMAP_COLOR_DEPTH_32).
//The buffers will not be released by this function.
void bitmapReadRowColorDepth_32(bitmap_t* bitmap, const uint8_t* rowData, bitmap_pixel_t* outputData, uint32_t rowPx)
{
uint32_t widthPx = bitmap->parameters.widthPx;
bitmap_color_space_t colorSpace = bitmap->parameters.colorSpace;
size_t baseIndex = rowPx * widthPx;
for (uint32_t colPx = 0; colPx < widthPx; colPx++)
{
bitmap_pixel_rgb_t currPixel;
currPixel.r = rowData[(4 * colPx) + 2];
currPixel.g = rowData[(4 * colPx) + 1];
currPixel.b = rowData[(4 * colPx) + 0];
currPixel.c3 = rowData[(4 * colPx) + 3];
outputData[baseIndex + colPx] = rgbToPixel(currPixel, colorSpace);
}
}
//Internal pixel read function (BITMAP_COMPRESSION_NONE).
//If the function succeeds, the pixel pointer is valid.
//
//Errors:
//- BITMAP_ERROR_IO An IO error has occurred.
//- BITMAP_ERROR_MEMORY Insufficient memory.
//
//The file will not be closed by this function.
bitmap_error_t bitmapReadPixelsCompression_None(bitmap_t* bitmap, bitmap_pixel_t** pixels)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Decompressing BITMAP_COMPRESSION_NONE ...");
//Get width and height:
uint32_t widthPx = bitmap->parameters.widthPx;
uint32_t heightPx = bitmap->parameters.heightPx;
uint32_t totalPx = widthPx * heightPx;
//Allocate space for the pixels:
bitmap_pixel_t* outputData = (bitmap_pixel_t*)malloc(totalPx * sizeof(bitmap_pixel_t));
if (!outputData)
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Insufficient memory for allocating pixel buffer.");
return BITMAP_ERROR_MEMORY;
}
//How many bytes are in a row?
size_t bitsPerRow = bitmap->parameters.colorDepth * widthPx;
size_t bytesPerRow = ((bitsPerRow + 31) / 32) * 4;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Bits / bytes per row: %zu / %zu", bitsPerRow, bytesPerRow);
//Allocate memory for a row:
uint8_t* rowData = (uint8_t*)malloc(bytesPerRow);
if (!rowData)
{
//Free the pixel buffer:
free(outputData);
bitmapLog(BITMAP_LOGGING_DEFAULT, "Insufficient memory for allocating row buffer.");
return BITMAP_ERROR_MEMORY;
}
//Status var:
bitmap_error_t success;
//Read row by row:
for (uint32_t rowPx = 0; rowPx < heightPx; rowPx++)
{
//Read the row:
if ((success = bitmapReadBytes(bitmap->file, rowData, bytesPerRow)) != BITMAP_ERROR_SUCCESS)
{
break;
}
//Parse it, depending on the color depth:
switch (bitmap->parameters.colorDepth)
{
case BITMAP_COLOR_DEPTH_1:
bitmapReadRowColorDepth_1(bitmap, rowData, outputData, rowPx);
break;
case BITMAP_COLOR_DEPTH_8:
bitmapReadRowColorDepth_8(bitmap, rowData, outputData, rowPx);
break;
case BITMAP_COLOR_DEPTH_24:
bitmapReadRowColorDepth_24(bitmap, rowData, outputData, rowPx);
break;
case BITMAP_COLOR_DEPTH_32:
bitmapReadRowColorDepth_32(bitmap, rowData, outputData, rowPx);
break;
default:
bitmapLog(BITMAP_LOGGING_DEFAULT, "Color depth is not (yet) supported. Sorry!");
success = BITMAP_ERROR_INVALID_FILE_FORMAT;
}
//Check success:
if (success != BITMAP_ERROR_SUCCESS)
{
break;
}
}
//If we were successful, we assign the pointers:
if (success == BITMAP_ERROR_SUCCESS)
{
*pixels = outputData;
//Finished!
bitmapLog(BITMAP_LOGGING_VERBOSE, "All pixels have been decompressed.");
}
else
{
//Free the pixel buffer:
free(outputData);
}
//Free the row data:
free(rowData);
return success;
}
//Internal DIB header reading function (BITMAP_DIB_HEADER_INFO).
//
//Errors:
//
//- BITMAP_ERROR_INVALID_FILE_FORMAT Something bad inside the DIB header. Or we don't support some feature.
//- BITMAP_ERROR_IO A read error has occurred.
//
//The file will not be closed by this function.
bitmap_error_t bitmapReadDIBHeader_Info(bitmap_t* bitmap)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Starting to read DIB header (BITMAP_DIB_HEADER_INFO) ...");
//Status var:
bitmap_error_t success;
//Read the width:
if ((success = bitmapReadU32(bitmap->file, &(bitmap->parameters.widthPx))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
//Read the height:
int32_t heightPx;
if ((success = bitmapReadI32(bitmap->file, &heightPx)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
//Top-Down or bottom-up?
if (heightPx > 0)
{
bitmap->parameters.bottomUp = 1;
bitmap->parameters.heightPx = (uint32_t)heightPx;
}
else
{
bitmap->parameters.bottomUp = 0;
bitmap->parameters.heightPx = (uint32_t)-heightPx;
}
//Check size:
if ((bitmap->parameters.widthPx == 0) || (bitmap->parameters.heightPx == 0))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Width and / or height in pixels is 0.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Bitmap pixel dimensions: %u x %u (width x height)", bitmap->parameters.widthPx, bitmap->parameters.heightPx);
bitmapLog(BITMAP_LOGGING_VERBOSE, "Bottom-up: %s", (bitmap->parameters.bottomUp ? "true" : "false"));
//Read the biPlanes (ignored):
uint16_t biPlanes;
if ((success = bitmapReadU16(bitmap->file, &biPlanes)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "BiPlanes: %u (ignored)", biPlanes);
if (biPlanes != 1)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "... but shouldn't that be 1 ?!");
}
//Read the color depth:
if ((success = bitmapReadU16(bitmap->file, &(bitmap->parameters.colorDepth))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
switch (bitmap->parameters.colorDepth)
{
case BITMAP_COLOR_DEPTH_1:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 2 indexed colors");
break;
case BITMAP_COLOR_DEPTH_4:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 16 indexed colors");
break;
case BITMAP_COLOR_DEPTH_8:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 256 indexed colors");
break;
case BITMAP_COLOR_DEPTH_16:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 16 bit");
break;
case BITMAP_COLOR_DEPTH_24:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 24 bit");
break;
case BITMAP_COLOR_DEPTH_32:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color depth: 32 bit");
break;
default:
bitmapLog(BITMAP_LOGGING_DEFAULT, "Unknown color depth: %u bit", bitmap->parameters.colorDepth);
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
//Read the compression:
uint32_t rawCompression;
if ((success = bitmapReadU32(bitmap->file, &rawCompression)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
switch (rawCompression)
{
case 0:
bitmap->parameters.compression = BITMAP_COMPRESSION_NONE;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Compression: none");
break;
case 1:
bitmap->parameters.compression = BITMAP_COMPRESSION_RLE;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Compression: RLE (8 bit)");
//Make sure this is valid:
if ((bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_8) || !(bitmap->parameters.bottomUp))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Invalid bitmap compression in this context.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
break;
case 2:
bitmap->parameters.compression = BITMAP_COMPRESSION_RLE;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Compression: RLE (4 bit)");
//Make sure this is valid:
if ((bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_4) || !(bitmap->parameters.bottomUp))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Invalid bitmap compression in this context.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
break;
case 3:
bitmap->parameters.compression = BITMAP_COMPRESSION_BITFIELD_RGB;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Compression: Bitfield (RGB)");
//Make sure this is valid:
if ((bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_16) && (bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_32))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Invalid bitmap compression in this context.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
break;
case 6:
bitmap->parameters.compression = BITMAP_COMPRESSION_BITFIELD_ARGB;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Compression: Bitfield (ARGB)");
//Make sure this is valid:
if ((bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_16) && (bitmap->parameters.colorDepth != BITMAP_COLOR_DEPTH_32))
{
bitmapLog(BITMAP_LOGGING_DEFAULT, "Invalid bitmap compression in this context.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
break;
default:
bitmapLog(BITMAP_LOGGING_DEFAULT, "Unknown bitmap compression: %u", rawCompression);
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
//Read the size of the pixel data (ignored):
uint32_t pixelDataSize;
if ((success = bitmapReadU32(bitmap->file, &pixelDataSize)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Pixel data size in bytes: %u (ignored)", pixelDataSize);
//Read the pixels per meter (ignored):
uint32_t pixelsPerMeterX;
if ((success = bitmapReadU32(bitmap->file, &pixelsPerMeterX)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
uint32_t pixelsPerMeterY;
if ((success = bitmapReadU32(bitmap->file, &pixelsPerMeterY)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Bitmap destination resolution: %u p/m in X, %u p/m in Y (ignored)", pixelsPerMeterX, pixelsPerMeterY);
//Read the number of valid color table entries:
uint32_t colorTableEntries;
if ((success = bitmapReadU32(bitmap->file, &colorTableEntries)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
//Correct potential zeros:
if (colorTableEntries == 0)
{
switch (bitmap->parameters.colorDepth)
{
case BITMAP_COLOR_DEPTH_1:
colorTableEntries = 2;
break;
case BITMAP_COLOR_DEPTH_4:
colorTableEntries = 16;
break;
case BITMAP_COLOR_DEPTH_8:
colorTableEntries = 256;
break;
}
}
else
{
//Clamp the value if necessary:
if (colorTableEntries > 256)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Clamping number of color table entries from %u to 256.", colorTableEntries);
colorTableEntries = 256;
}
}
bitmap->parameters.colorTableEntries = colorTableEntries;
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color table entries: %u", bitmap->parameters.colorTableEntries);
//Read the number of important color table entries (ignored):
uint32_t importantColorTableEntries;
if ((success = bitmapReadU32(bitmap->file, &importantColorTableEntries)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Important color table entries: %u (ignored)", importantColorTableEntries);
//Depending on the compression, we have to read the bitmasks now:
if (bitmap->parameters.compression == BITMAP_COMPRESSION_BITFIELD_RGB)
{
if ((success = bitmapReadBytes(bitmap->file, (uint8_t*)&(bitmap->parameters.bitmasks), 3 * sizeof(uint32_t))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "RGB bitmasks have been read.");
}
else if (bitmap->parameters.compression == BITMAP_COMPRESSION_BITFIELD_ARGB)
{
if ((success = bitmapReadBytes(bitmap->file, (uint8_t*)&(bitmap->parameters.bitmasks), 4 * sizeof(uint32_t))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "ARGB bitmasks have been read.");
}
else
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "No bitmasks have been read.");
}
//Finally, read the color table:
if (bitmap->parameters.colorTableEntries)
{
bitmap_pixel_rgb_t colorTable[256];
if ((success = bitmapReadBytes(bitmap->file, (uint8_t*)&colorTable, bitmap->parameters.colorTableEntries * sizeof(bitmap_pixel_rgb_t))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
//Now shuffle the table to the right order:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Color table (RGBA):");
for (uint32_t i = 0; i < bitmap->parameters.colorTableEntries; i++)
{
bitmap_pixel_rgb_t currPixel = colorTable[i];
bitmap_pixel_rgb_t newPixel;
newPixel.r = currPixel.b;
newPixel.g = currPixel.g;
newPixel.b = currPixel.r;
newPixel.c3 = currPixel.c3;
bitmapLog(BITMAP_LOGGING_VERBOSE, " (0x%02X, 0x%02X, 0x%02X, 0x%02X)", newPixel.r, newPixel.g, newPixel.b, newPixel.c3);
//Convert the pixel to our color space and insert it:
bitmap->parameters.colorTable[i] = rgbToPixel(newPixel, bitmap->parameters.colorSpace);
}
}
else
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "No color table has been read.");
}
//Okay, that worked :-)
bitmapLog(BITMAP_LOGGING_VERBOSE, "DIB header (info) has successfully been read.");
return BITMAP_ERROR_SUCCESS;
}
//Internal header reading function.
//
//Errors:
//
//- BITMAP_ERROR_INVALID_FILE_FORMAT Something bad inside the header. Or we don't support some feature.
//- BITMAP_ERROR_IO A read error has occurred.
//
//The file will not be closed by this function.
bitmap_error_t bitmapReadHeader(bitmap_t* bitmap)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Starting to read header ...");
//Status var:
bitmap_error_t success;
//Read and verify the magic number:
uint16_t magicNumber;
if ((success = bitmapReadU16(bitmap->file, &magicNumber)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
if (magicNumber != BITMAP_MAGIC_NUMBER)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Wrong magic number (0x%04X). This does not look like a bitmap.", magicNumber);
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Magic number is a match.");
//Read and ignore the size in bytes:
uint32_t sizeInBytes;
if ((success = bitmapReadU32(bitmap->file, &sizeInBytes)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Size in bytes: %u (ignored)", sizeInBytes);
//Read and ignore the writer-specific blob:
uint32_t writerSpecific;
if ((success = bitmapReadU32(bitmap->file, &writerSpecific)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Writer-specific blob: %u (ignored)", writerSpecific);
//Read the pixel offset:
if ((success = bitmapReadU32(bitmap->file, &(bitmap->pixelOffset))) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Pixel offset: 0x%04X", bitmap->pixelOffset);
//Read the size of the info header structure:
uint32_t infoHeaderSize;
if ((success = bitmapReadU32(bitmap->file, &infoHeaderSize)) != BITMAP_ERROR_SUCCESS)
{
return success;
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "Info header size in bytes: %u", infoHeaderSize);
//The size tells us about the type.
switch (infoHeaderSize)
{
case BITMAP_DIB_HEADER_CORE_OS2_1X:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_CORE_OS2_1X");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported. Sorry!");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
case BITMAP_DIB_HEADER_OS2_2X:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_OS2_2X");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported. Sorry!");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
case BITMAP_DIB_HEADER_OS2_2X_SHORT:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_OS2_2X_SHORT");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported. Sorry!");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
case BITMAP_DIB_HEADER_INFO_V5:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_INFO_V5");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported.");
bitmapLog(BITMAP_LOGGING_DEFAULT, "Trying fallback to V4 ...");
/* fall through */
case BITMAP_DIB_HEADER_INFO_V4:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_INFO_V4");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported.");
bitmapLog(BITMAP_LOGGING_DEFAULT, "Trying fallback to V3 ...");
/* fall through */
case BITMAP_DIB_HEADER_INFO_V3:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_INFO_V3");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported.");
bitmapLog(BITMAP_LOGGING_DEFAULT, "Trying fallback to V2 ...");
/* fall through */
case BITMAP_DIB_HEADER_INFO_V2:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_INFO_V2");
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is not (yet) supported.");
bitmapLog(BITMAP_LOGGING_DEFAULT, "Trying fallback to V1 ...");
/* fall through */
case BITMAP_DIB_HEADER_INFO:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Identified DIB header: BITMAP_DIB_HEADER_INFO");
if ((success = bitmapReadDIBHeader_Info(bitmap)))
{
return success;
}
break;
default:
bitmapLog(BITMAP_LOGGING_DEFAULT, "DIB header format is unknown.");
return BITMAP_ERROR_INVALID_FILE_FORMAT;
}
//That's it:
bitmapLog(BITMAP_LOGGING_VERBOSE, "Bitmap header parsing has succeeded!");
return BITMAP_ERROR_SUCCESS;
}
//Internal file open function.
//If the function succeeds, the file pointer in the bitmap struct is valid.
//
//Errors:
//- BITMAP_ERROR_INVALID_PATH The given path is not valid in any way (missing file, bad permissions etc.).
//- BITMAP_ERROR_INVALID_FILE_FORMAT The given file is no valid bitmap.
//- BITMAP_ERROR_IO An IO error has occurred.
//- BITMAP_ERROR_MEMORY Insufficient memory.
//
bitmap_error_t bitmapOpenFile(bitmap_t* bitmap, const char* filePath)
{
bitmapLog(BITMAP_LOGGING_VERBOSE, "Going to open file \"%s\" ...", filePath);
//Try to open the file:
FILE* file = fopen(filePath, "rb");
if (!file)
{
switch (errno)
{
case ENOENT:
bitmapLog(BITMAP_LOGGING_DEFAULT, "File path to \"%s\" is invalid.", filePath);
return BITMAP_ERROR_INVALID_PATH;
case ENOMEM:
bitmapLog(BITMAP_LOGGING_DEFAULT, "Insufficient memory for opening file.");
return BITMAP_ERROR_MEMORY;
default:
bitmapLog(BITMAP_LOGGING_DEFAULT, "Error opening file at \"%s\": %s", filePath, strerror(errno));
return BITMAP_ERROR_INVALID_PATH;
}
}
bitmapLog(BITMAP_LOGGING_VERBOSE, "File has been opened successfully.");
//Set file pointer:
bitmap->file = file;
return BITMAP_ERROR_SUCCESS;
}
//User-accessible.
bitmap_error_t bitmapReadPixels(const char* filePath, bitmap_pixel_t** pixels, uint32_t* widthPx, uint32_t* heightPx, bitmap_color_space_t colorSpace)
{
//NULL the pointers:
*pixels = NULL;
*widthPx = 0;
*heightPx = 0;
//Init a bitmap struct:
bitmap_t bitmap;
memset(&bitmap, 0, sizeof(bitmap_t));
//Assign our color space:
bitmap.parameters.colorSpace = colorSpace;
//Status var: