Embedded Artists / DMBasicGUI

A basic graphics package for the LPC4088 Display Module.

Dependents:   lpc4088_displaymodule_demo_sphere sampleGUI sampleEmptyGUI lpc4088_displaymodule_fs_aid ... more

Fork of DMBasicGUI by EmbeddedArtists AB

Application/bmp.cpp@0:4977187e90c7, 2014-12-11 (annotated)

Committer:
embeddedartists
Date:
Thu Dec 11 11:03:57 2014 +0000
Revision:
0:4977187e90c7
Child:
10:651861441108
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:4977187e90c7 1 /* ----------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 2 * ATMEL Microcontroller Software Support - ROUSSET -
embeddedartists 0:4977187e90c7 3 * ----------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 4 * Copyright (c) 2006, Atmel Corporation
embeddedartists 0:4977187e90c7 5
embeddedartists 0:4977187e90c7 6 * All rights reserved.
embeddedartists 0:4977187e90c7 7 *
embeddedartists 0:4977187e90c7 8 * Redistribution and use in source and binary forms, with or without
embeddedartists 0:4977187e90c7 9 * modification, are permitted provided that the following conditions are met:
embeddedartists 0:4977187e90c7 10 *
embeddedartists 0:4977187e90c7 11 * - Redistributions of source code must retain the above copyright notice,
embeddedartists 0:4977187e90c7 12 * this list of conditions and the disclaiimer below.
embeddedartists 0:4977187e90c7 13 *
embeddedartists 0:4977187e90c7 14 * - Redistributions in binary form must reproduce the above copyright notice,
embeddedartists 0:4977187e90c7 15 * this list of conditions and the disclaimer below in the documentation and/or
embeddedartists 0:4977187e90c7 16 * other materials provided with the distribution.
embeddedartists 0:4977187e90c7 17 *
embeddedartists 0:4977187e90c7 18 * Atmel's name may not be used to endorse or promote products derived from
embeddedartists 0:4977187e90c7 19 * this software without specific prior written permission.
embeddedartists 0:4977187e90c7 20 *
embeddedartists 0:4977187e90c7 21 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
embeddedartists 0:4977187e90c7 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
embeddedartists 0:4977187e90c7 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
embeddedartists 0:4977187e90c7 24 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
embeddedartists 0:4977187e90c7 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
embeddedartists 0:4977187e90c7 26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
embeddedartists 0:4977187e90c7 27 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
embeddedartists 0:4977187e90c7 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
embeddedartists 0:4977187e90c7 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
embeddedartists 0:4977187e90c7 30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
embeddedartists 0:4977187e90c7 31 * ----------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 32 */
embeddedartists 0:4977187e90c7 33
embeddedartists 0:4977187e90c7 34 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 35 // Headers
embeddedartists 0:4977187e90c7 36 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 37
embeddedartists 0:4977187e90c7 38 #include "mbed.h"
embeddedartists 0:4977187e90c7 39 #include "bmp.h"
embeddedartists 0:4977187e90c7 40
embeddedartists 0:4977187e90c7 41 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 42 // Internal constants
embeddedartists 0:4977187e90c7 43 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 44
embeddedartists 0:4977187e90c7 45 /// BMP magic number ('BM').
embeddedartists 0:4977187e90c7 46 #define BMP_TYPE 0x4D42
embeddedartists 0:4977187e90c7 47
embeddedartists 0:4977187e90c7 48 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 49 // Internal types
embeddedartists 0:4977187e90c7 50 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 51
embeddedartists 0:4977187e90c7 52 struct BMPPaletteEntry {
embeddedartists 0:4977187e90c7 53
embeddedartists 0:4977187e90c7 54 unsigned char b;
embeddedartists 0:4977187e90c7 55 unsigned char g;
embeddedartists 0:4977187e90c7 56 unsigned char r;
embeddedartists 0:4977187e90c7 57 unsigned char filler;
embeddedartists 0:4977187e90c7 58 };
embeddedartists 0:4977187e90c7 59
embeddedartists 0:4977187e90c7 60 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 61 // Exported functions
embeddedartists 0:4977187e90c7 62 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 63
embeddedartists 0:4977187e90c7 64 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 65 /// Returns 1 if the header of a BMP file is valid; otherwise returns 0.
embeddedartists 0:4977187e90c7 66 /// \param file Buffer holding the file to examinate.
embeddedartists 0:4977187e90c7 67 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 68 unsigned char BMP_IsValid(void *file)
embeddedartists 0:4977187e90c7 69 {
embeddedartists 0:4977187e90c7 70 return ((struct BMPHeader *) file)->type == BMP_TYPE;
embeddedartists 0:4977187e90c7 71 }
embeddedartists 0:4977187e90c7 72
embeddedartists 0:4977187e90c7 73 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 74 /// Returns the size of a BMP image given at least its header (the file does
embeddedartists 0:4977187e90c7 75 /// not have to be complete).
embeddedartists 0:4977187e90c7 76 /// \param file Pointer to the buffer which holds the BMP file.
embeddedartists 0:4977187e90c7 77 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 78 unsigned int BMP_GetFileSize(void *file)
embeddedartists 0:4977187e90c7 79 {
embeddedartists 0:4977187e90c7 80 return ((struct BMPHeader *) file)->fileSize;
embeddedartists 0:4977187e90c7 81 }
embeddedartists 0:4977187e90c7 82
embeddedartists 0:4977187e90c7 83 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 84 /// Loads a BMP image located at the given address, decodes it and stores the
embeddedartists 0:4977187e90c7 85 /// resulting image inside the provided buffer. Image must have the specified
embeddedartists 0:4977187e90c7 86 /// width & height.
embeddedartists 0:4977187e90c7 87 /// Returns 0 if the image has been loaded; otherwise returns an error code.
embeddedartists 0:4977187e90c7 88 /// \param file Buffer which holds the BMP file.
embeddedartists 0:4977187e90c7 89 /// \param buffer Buffer in which to store the decoded image.
embeddedartists 0:4977187e90c7 90 /// \param width Buffer width in pixels.
embeddedartists 0:4977187e90c7 91 /// \param height Buffer height in pixels.
embeddedartists 0:4977187e90c7 92 /// \param bpp Number of bits per pixels that the buffer stores.
embeddedartists 0:4977187e90c7 93 //------------------------------------------------------------------------------
embeddedartists 0:4977187e90c7 94 unsigned char BMP_Decode(
embeddedartists 0:4977187e90c7 95 void *file,
embeddedartists 0:4977187e90c7 96 unsigned char *buffer,
embeddedartists 0:4977187e90c7 97 unsigned int width,
embeddedartists 0:4977187e90c7 98 unsigned int height,
embeddedartists 0:4977187e90c7 99 unsigned char bpp,
embeddedartists 0:4977187e90c7 100 unsigned char target_bpp) // 16 or 24
embeddedartists 0:4977187e90c7 101 {
embeddedartists 0:4977187e90c7 102 struct BMPHeader *header;
embeddedartists 0:4977187e90c7 103 unsigned int i, j;
embeddedartists 0:4977187e90c7 104 unsigned char r, g, b;
embeddedartists 0:4977187e90c7 105 unsigned char *image;
embeddedartists 0:4977187e90c7 106
embeddedartists 0:4977187e90c7 107 // Read header information
embeddedartists 0:4977187e90c7 108 header = (struct BMPHeader *) file;
embeddedartists 0:4977187e90c7 109
embeddedartists 0:4977187e90c7 110 // Verify that the file is valid
embeddedartists 0:4977187e90c7 111 if (!BMP_IsValid(file)) {
embeddedartists 0:4977187e90c7 112
embeddedartists 0:4977187e90c7 113 printf("BMP_Decode: File type is not 'BM' (0x%x).\n\r",
embeddedartists 0:4977187e90c7 114 header->type);
embeddedartists 0:4977187e90c7 115 return 1;
embeddedartists 0:4977187e90c7 116 }
embeddedartists 0:4977187e90c7 117
embeddedartists 0:4977187e90c7 118 // Check that parameters match
embeddedartists 0:4977187e90c7 119 if ((header->compression != 0)
embeddedartists 0:4977187e90c7 120 || (header->width != width)
embeddedartists 0:4977187e90c7 121 || (header->height != height)) {
embeddedartists 0:4977187e90c7 122
embeddedartists 0:4977187e90c7 123 printf("BMP_Decode: File format not supported\n\r");
embeddedartists 0:4977187e90c7 124 printf(" -> .compression = %d\n\r", header->compression);
embeddedartists 0:4977187e90c7 125 printf(" -> .width = %d\n\r", header->width);
embeddedartists 0:4977187e90c7 126 printf(" -> .height = %d\n\r", header->height);
embeddedartists 0:4977187e90c7 127 printf(" -> .bits = %d\n\r", header->bits);
embeddedartists 0:4977187e90c7 128 return 2;
embeddedartists 0:4977187e90c7 129 }
embeddedartists 0:4977187e90c7 130
embeddedartists 0:4977187e90c7 131 // Get image data
embeddedartists 0:4977187e90c7 132 image = (unsigned char *) ((unsigned int) file + header->offset);
embeddedartists 0:4977187e90c7 133
embeddedartists 0:4977187e90c7 134 // Check that the bpp resolution is supported
embeddedartists 0:4977187e90c7 135 // Only a 24-bit output & 24- or 8-bit input are supported
embeddedartists 0:4977187e90c7 136 if (bpp != 24) {
embeddedartists 0:4977187e90c7 137
embeddedartists 0:4977187e90c7 138 printf("BMP_Decode: Output resolution not supported\n\r");
embeddedartists 0:4977187e90c7 139 return 3;
embeddedartists 0:4977187e90c7 140 }
embeddedartists 0:4977187e90c7 141 else if (header->bits == 24) {
embeddedartists 0:4977187e90c7 142
embeddedartists 0:4977187e90c7 143 // Modified by Embedded Artists. This padding was not handled in the original
embeddedartists 0:4977187e90c7 144 // implementation. Each row in the Pixel Array is padded to a multiple of 4 bytes in size
embeddedartists 0:4977187e90c7 145 int rowWidthBytes = width * 3;
embeddedartists 0:4977187e90c7 146 rowWidthBytes += (rowWidthBytes % 4);
embeddedartists 0:4977187e90c7 147
embeddedartists 0:4977187e90c7 148 // Copy raw data from BMP to buffer (reversing row order)
embeddedartists 0:4977187e90c7 149 for (i=0; i < height; i++) {
embeddedartists 0:4977187e90c7 150 #if 1
embeddedartists 0:4977187e90c7 151 if (target_bpp == 16) {
embeddedartists 0:4977187e90c7 152 // Modified by Embedded Artists to convert to 565-format instead of 24 bit
embeddedartists 0:4977187e90c7 153 for(int x=0; x<width; x++)
embeddedartists 0:4977187e90c7 154 {
embeddedartists 0:4977187e90c7 155 r = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 2);
embeddedartists 0:4977187e90c7 156 g = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 1);
embeddedartists 0:4977187e90c7 157 b = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 0);
embeddedartists 0:4977187e90c7 158 *(unsigned short *)(buffer + (i * width) * 2 + 2*x) = (((unsigned short)r & 0xF8) << 8) |
embeddedartists 0:4977187e90c7 159 (((unsigned short)g & 0xFC) << 3) |
embeddedartists 0:4977187e90c7 160 (((unsigned short)b & 0xF8) >> 3);
embeddedartists 0:4977187e90c7 161 }
embeddedartists 0:4977187e90c7 162 } else {
embeddedartists 0:4977187e90c7 163 // Modified by Embedded Artists to add alpha channel in 24 bit output
embeddedartists 0:4977187e90c7 164 for(int x=0; x<width; x++)
embeddedartists 0:4977187e90c7 165 {
embeddedartists 0:4977187e90c7 166 r = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 2);
embeddedartists 0:4977187e90c7 167 g = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 1);
embeddedartists 0:4977187e90c7 168 b = *(unsigned char *)(image + (height - i - 1) * rowWidthBytes + 3*x + 0);
embeddedartists 0:4977187e90c7 169 *(unsigned int *)(buffer + (i * width) * 4 + 4*x) = (r << 16) | (g << 8) | b;
embeddedartists 0:4977187e90c7 170 }
embeddedartists 0:4977187e90c7 171 }
embeddedartists 0:4977187e90c7 172 #else
embeddedartists 0:4977187e90c7 173 memcpy(buffer + (i * width) * 3,
embeddedartists 0:4977187e90c7 174 image + ((height - i - 1) * width) * 3,
embeddedartists 0:4977187e90c7 175 width * 3);
embeddedartists 0:4977187e90c7 176 #endif
embeddedartists 0:4977187e90c7 177 }
embeddedartists 0:4977187e90c7 178
embeddedartists 0:4977187e90c7 179 #if 0
embeddedartists 0:4977187e90c7 180 // Swap red and blue
embeddedartists 0:4977187e90c7 181 for (i=0; i < height; i++) {
embeddedartists 0:4977187e90c7 182 for (j=0; j < width; j++) {
embeddedartists 0:4977187e90c7 183
embeddedartists 0:4977187e90c7 184 r = buffer[(i * width + j) * 3 + 2];
embeddedartists 0:4977187e90c7 185 g = buffer[(i * width + j) * 3 + 1];
embeddedartists 0:4977187e90c7 186 b = buffer[(i * width + j) * 3];
embeddedartists 0:4977187e90c7 187
embeddedartists 0:4977187e90c7 188 buffer[(i * width + j) * 3] = r;
embeddedartists 0:4977187e90c7 189 buffer[(i * width + j) * 3 + 1] = g;
embeddedartists 0:4977187e90c7 190 buffer[(i * width + j) * 3 + 2] = b;
embeddedartists 0:4977187e90c7 191 }
embeddedartists 0:4977187e90c7 192 }
embeddedartists 0:4977187e90c7 193 #endif
embeddedartists 0:4977187e90c7 194 }
embeddedartists 0:4977187e90c7 195 else if (header->bits == 8) {
embeddedartists 0:4977187e90c7 196
embeddedartists 0:4977187e90c7 197 // Retrieve palette
embeddedartists 0:4977187e90c7 198 struct BMPPaletteEntry palette[256];
embeddedartists 0:4977187e90c7 199 memcpy(palette,
embeddedartists 0:4977187e90c7 200 (unsigned char *) ((unsigned int) file + sizeof(struct BMPHeader)),
embeddedartists 0:4977187e90c7 201 header->offset - sizeof(struct BMPHeader));
embeddedartists 0:4977187e90c7 202
embeddedartists 0:4977187e90c7 203 // Decode image (reversing row order)
embeddedartists 0:4977187e90c7 204 for (i=0; i < height; i++) {
embeddedartists 0:4977187e90c7 205 for (j=0; j < width; j++) {
embeddedartists 0:4977187e90c7 206
embeddedartists 0:4977187e90c7 207 r = palette[image[(height - i - 1) * width + j]].r;
embeddedartists 0:4977187e90c7 208 g = palette[image[(height - i - 1) * width + j]].g;
embeddedartists 0:4977187e90c7 209 b = palette[image[(height - i - 1) * width + j]].b;
embeddedartists 0:4977187e90c7 210
embeddedartists 0:4977187e90c7 211 buffer[(i * width + j) * 3] = r;
embeddedartists 0:4977187e90c7 212 buffer[(i * width + j) * 3 + 1] = g;
embeddedartists 0:4977187e90c7 213 buffer[(i * width + j) * 3 + 2] = b;
embeddedartists 0:4977187e90c7 214 }
embeddedartists 0:4977187e90c7 215 }
embeddedartists 0:4977187e90c7 216 }
embeddedartists 0:4977187e90c7 217 else {
embeddedartists 0:4977187e90c7 218
embeddedartists 0:4977187e90c7 219 printf("BMP_Decode: Input resolution not supported\n\r");
embeddedartists 0:4977187e90c7 220 return 4;
embeddedartists 0:4977187e90c7 221 }
embeddedartists 0:4977187e90c7 222
embeddedartists 0:4977187e90c7 223 return 0;
embeddedartists 0:4977187e90c7 224 }
embeddedartists 0:4977187e90c7 225