From 0b32a222231826bc894557c322f1f1b908103e3c Mon Sep 17 00:00:00 2001 From: John Mark Bell Date: Sun, 29 Mar 2009 01:30:16 +0000 Subject: First cut at a port to the new buildsystem svn path=/trunk/libnsbmp/; revision=6981 --- libnsbmp.c | 1124 ------------------------------------------------------------ 1 file changed, 1124 deletions(-) delete mode 100644 libnsbmp.c (limited to 'libnsbmp.c') diff --git a/libnsbmp.c b/libnsbmp.c deleted file mode 100644 index 6101e07..0000000 --- a/libnsbmp.c +++ /dev/null @@ -1,1124 +0,0 @@ -/* - * Copyright 2006 Richard Wilson - * Copyright 2008 Sean Fox - * - * This file is part of NetSurf's libnsbmp, http://www.netsurf-browser.org/ - * Licenced under the MIT License, - * http://www.opensource.org/licenses/mit-license.php - */ - -#include -#include -#include -#include -#include -#include -#include "libnsbmp.h" -#include "utils/log.h" - -/* The functions provided by this file allow for the decoding of - Microsoft's BMP and ICO image file formats. - - READING BMP FILES - ================= - - To begin decoding a BMP, the caller should initialise a - 'bmp_bitmap_callback_vt' structure with the appropriate values necessary - to handle bitmap images. Next, a 'bmp_image' structure should be - initialised by calling bmp_create(). This structure should then be - passed to bmp_analyse() along with the BMP data to process and the size - of this data. - - Once the analysis has begun, the decoder completes the width and height - variables. - - To decode the image, the caller must use bmp_decode() which selects the - proper decoding method based on the BMP info header and assigns the - decoded bitmap image to the 'bitmap' member of the 'bmp_image' - structure. The bitmap image is stored with 4 bytes-per-pixel in RGBA - format. - - It should be noted that bmp_finalise() should always be called, even if - the image was never decoded. It is also the responsibility of the - caller to free 'bmp_data'. - - READING ICO FILES - ================= - - To begin decoding an ICO, the caller should initialise a - 'bmp_bitmap_callback_vt' structure with the appropriate values necessary - to handle bitmap images. Next, an 'ico_collection' structure should be - initialised by calling ico_create(). This structure should then be - passed to ico_analyse() along with the ICO data to process and the size - of this data. - - Once the analysis has begun, the decoder completes the width and height - variables. Because ICO collections contain multiple bitmap images, the - width and height will contain the values of the largest available image. - - The caller then obtains a BMP from the ICO collection by calling - ico_find() with the requested width and height. - - To decode the image, the caller must use bmp_decode() which selects the - proper decoding method based on the BMP info header and assigns the - decoded bitmap image to the 'bitmap' member of the 'bmp_image' - structure. The bitmap image is stored with 4 bytes-per-pixel in RGBA - format. - - It should be noted that ico_finalise() should always be called, even if - no images were decoded. Because ico_finalise() calls bmp_finalise() for - each bitmap within the collection, the caller is not required to perform - this function. However, it is the responsibility of the caller to free - 'ico_data'. - - [dynis] - Tue 1st July 2008 -*/ - -/* squashes unused variable compiler warnings */ -#define UNUSED(x) ((x)=(x)) - -/* BMP flags */ -#define BMP_FILE_HEADER_SIZE 14 -#define ICO_FILE_HEADER_SIZE 6 -#define ICO_DIR_ENTRY_SIZE 16 - -static inline int8_t read_int8(uint8_t *data, unsigned int o) { - return (int8_t) data[o]; -} - -static inline uint8_t read_uint8(uint8_t *data, unsigned int o) { - return (uint8_t) data[o]; -} - -static inline int16_t read_int16(uint8_t *data, unsigned int o) { - return (int16_t) (data[o] | (data[o+1] << 8)); -} - -static inline uint16_t read_uint16(uint8_t *data, unsigned int o) { - return (uint16_t) (data[o] | (data[o+1] << 8)); -} - -static inline int32_t read_int32(uint8_t *data, unsigned int o) { - return (int32_t) (data[o] | (data[o+1] << 8) | (data[o+2] << 16) | (data[o+3] << 24)); -} - -static inline uint32_t read_uint32(uint8_t *data, unsigned int o) { - return (uint32_t) (data[o] | (data[o+1] << 8) | (data[o+2] << 16) | (data[o+3] << 24)); -} - -static bmp_result next_ico_image(ico_collection *ico, ico_image *image); -static bmp_result bmp_analyse_header(bmp_image *bmp, unsigned char *data); -static bmp_result bmp_decode_rgb24(bmp_image *bmp, uint8_t **start, int bytes); -static bmp_result bmp_decode_rgb16(bmp_image *bmp, uint8_t **start, int bytes); -static bmp_result bmp_decode_rgb(bmp_image *bmp, uint8_t **start, int bytes); -static bmp_result bmp_decode_mask(bmp_image *bmp, uint8_t *data, int bytes); -static bmp_result bmp_decode_rle(bmp_image *bmp, uint8_t *data, int bytes, int size); -static void bmp_invalidate(void *bitmap, void *private_word); - - - -/** Initialises necessary bmp_image members. -*/ -void bmp_create(bmp_image *bmp, bmp_bitmap_callback_vt *bitmap_callbacks) { - memset(bmp, 0, sizeof(bmp_image)); - bmp->bitmap_callbacks = *bitmap_callbacks; -} - - -/** Initialises necessary ico_collection members. -*/ -void ico_collection_create(ico_collection *ico, bmp_bitmap_callback_vt *bitmap_callbacks) { - memset(ico, 0, sizeof(ico_collection)); - ico->bitmap_callbacks = *bitmap_callbacks; -} - - -/** - * Analyse a BMP prior to decoding. - * - * This function will scan the data provided and perform simple checks to - * ensure the data is a valid BMP. - * - * This function must be called before bmp_decode() and sets up all the - * relevant values in the bmp structure. - * - * \param bmp the BMP image to analyse - * \return BMP_OK on success - */ -bmp_result bmp_analyse(bmp_image *bmp, size_t size, unsigned char *cdata) { - uint8_t *data = (uint8_t *)cdata; - - /* ensure we aren't already initialised */ - if (bmp->bitmap) - return BMP_OK; - - /* initialize values */ - bmp->buffer_size = size; - bmp->bmp_data = data; - - /* standard 14-byte BMP file header is: - * - * +0 UINT16 File Type ('BM') - * +2 UINT32 Size of File (in bytes) - * +6 INT16 Reserved Field (1) - * +8 INT16 Reserved Field (2) - * +10 UINT32 Starting Position of Image Data (offset in bytes) - */ - if (bmp->buffer_size < BMP_FILE_HEADER_SIZE) - return BMP_INSUFFICIENT_DATA; - if ((data[0] != (uint8_t)'B') || (data[1] != (uint8_t)'M')) - return BMP_DATA_ERROR; - bmp->bitmap_offset = read_uint32(data, 10); - data += BMP_FILE_HEADER_SIZE; - - /* boundary checking */ - if (bmp->bitmap_offset >= size) - return BMP_INSUFFICIENT_DATA; - - /* decode the BMP header */ - return bmp_analyse_header(bmp, data); -} - - -/** - * Analyse an ICO prior to decoding. - * - * This function will scan the data provided and perform simple checks to - * ensure the data is a valid ICO. - * - * This function must be called before ico_find(). - * - * \param ico the ICO image to analyse - * \return BMP_OK on success - */ -bmp_result ico_analyse(ico_collection *ico, size_t size, uint8_t *data) { - uint16_t count, i; - bmp_result result; - int area, max_area = 0; - - /* ensure we aren't already initialised */ - if (ico->first) - return BMP_OK; - - /* initialize values */ - ico->buffer_size = size; - ico->ico_data = data; - - /* 6-byte ICO file header is: - * - * +0 INT16 Reserved (should be 0) - * +2 UINT16 Type (1 for ICO, 2 for CUR) - * +4 UINT16 Number of BMPs to follow - */ - if (ico->buffer_size < ICO_FILE_HEADER_SIZE) - return BMP_INSUFFICIENT_DATA; -// if (read_int16(data, 2) != 0x0000) -// return BMP_DATA_ERROR; - if (read_uint16(data, 2) != 0x0001) - return BMP_DATA_ERROR; - count = read_uint16(data, 4); - if (count == 0) - return BMP_DATA_ERROR; - data += ICO_FILE_HEADER_SIZE; - - /* check if we have enough data for the directory */ - if (ico->buffer_size < (uint32_t)(ICO_FILE_HEADER_SIZE + (ICO_DIR_ENTRY_SIZE * count))) - return BMP_INSUFFICIENT_DATA; - - /* Decode the BMP files. - * - * 16-byte ICO directory entry is: - * - * +0 UINT8 Width (0 for 256 pixels) - * +1 UINT8 Height (0 for 256 pixels) - * +2 UINT8 Colour count (0 if more than 256 colours) - * +3 INT8 Reserved (should be 0, but may not be) - * +4 UINT16 Colour Planes (should be 0 or 1) - * +6 UINT16 Bits Per Pixel - * +8 UINT32 Size of BMP info header + bitmap data in bytes - * +12 UINT32 Offset (points to the BMP info header, not the bitmap data) - */ - for (i = 0; i < count; i++) { - ico_image *image; - image = calloc(1, sizeof(ico_image)); - if (!image) - return BMP_INSUFFICIENT_MEMORY; - result = next_ico_image(ico, image); - if (result != BMP_OK) - return result; - image->bmp.width = read_uint8(data, 0); - if (image->bmp.width == 0) - image->bmp.width = 256; - image->bmp.height = read_uint8(data, 1); - if (image->bmp.height == 0) - image->bmp.height = 256; - image->bmp.buffer_size = read_uint32(data, 8); - image->bmp.bmp_data = ico->ico_data + read_uint32(data, 12); - image->bmp.ico = true; - data += ICO_DIR_ENTRY_SIZE; - result = bmp_analyse_header(&image->bmp, image->bmp.bmp_data); - if (result != BMP_OK) - return result; - /* adjust the size based on the images available */ - area = image->bmp.width * image->bmp.height; - if (area > max_area) { - ico->width = image->bmp.width; - ico->height = image->bmp.height; - max_area = area; - } - } - return BMP_OK; -} - - -/** - * Allocates memory for the next BMP in an ICO collection - * - * Sets proper structure values - * - * \param ico the ICO collection to add the image to - * \param image a pointer to the ICO image to be initialised - */ -static bmp_result next_ico_image(ico_collection *ico, ico_image *image) { - bmp_create(&image->bmp, &ico->bitmap_callbacks); - image->next = ico->first; - ico->first = image; - return BMP_OK; -} - - -static bmp_result bmp_analyse_header(bmp_image *bmp, uint8_t *data) { - uint32_t header_size; - uint32_t i; - uint8_t j; - int32_t width, height; - uint32_t uheight; - uint8_t palette_size; - unsigned int flags; - - /* a variety of different bitmap headers can follow, depending - * on the BMP variant. A full description of the various headers - * can be found at - * http://msdn.microsoft.com/en-us/library/ms532301(VS.85).aspx - */ - header_size = read_uint32(data, 0); - if (bmp->buffer_size < (14 + header_size)) - return BMP_INSUFFICIENT_DATA; - if (header_size == 12) { - /* the following header is for os/2 and windows 2.x and consists of: - * - * +0 UINT32 size of this header (in bytes) - * +4 INT16 image width (in pixels) - * +6 INT16 image height (in pixels) - * +8 UINT16 number of colour planes (always 1) - * +10 UINT16 number of bits per pixel - */ - width = read_int16(data, 4); - height = read_int16(data, 6); - if ((width <= 0) || (height == 0)) - return BMP_DATA_ERROR; - if (height < 0) { - bmp->reversed = true; - height = -height; - } - /* ICOs only support 256*256 resolutions - * In the case of the ICO header, the height is actually the added - * height of XOR-Bitmap and AND-Bitmap (double the visible height) - * Technically we could remove this check and ICOs with bitmaps - * of any size could be processed; this is to conform to the spec. - */ - if (bmp->ico) { - if ((width > 256) || (height > 512)) { - return BMP_DATA_ERROR; - } else { - bmp->width = width; - bmp->height = height / 2; - } - } else { - bmp->width = width; - bmp->height = height; - } - if (read_uint16(data, 8) != 1) - return BMP_DATA_ERROR; - bmp->bpp = read_uint16(data, 10); - /** - * The bpp value should be in the range 1-32, but the only - * values considered legal are: - * RGB ENCODING: 1, 4, 8, 16, 24 and 32 - */ - if ((bmp->bpp != 1) && (bmp->bpp != 4) && - (bmp->bpp != 8) && - (bmp->bpp != 16) && - (bmp->bpp != 24) && - (bmp->bpp != 32)) - return BMP_DATA_ERROR; - bmp->colours = (1 << bmp->bpp); - palette_size = 3; - } else if (header_size < 40) { - return BMP_DATA_ERROR; - } else { - /* the following header is for windows 3.x and onwards. it is a - * minimum of 40 bytes and (as of Windows 95) a maximum of 108 bytes. - * - * +0 UINT32 size of this header (in bytes) - * +4 INT32 image width (in pixels) - * +8 INT32 image height (in pixels) - * +12 UINT16 number of colour planes (always 1) - * +14 UINT16 number of bits per pixel - * +16 UINT32 compression methods used - * +20 UINT32 size of bitmap (in bytes) - * +24 UINT32 horizontal resolution (in pixels per meter) - * +28 UINT32 vertical resolution (in pixels per meter) - * +32 UINT32 number of colours in the image - * +36 UINT32 number of important colours - * +40 UINT32 mask identifying bits of red component - * +44 UINT32 mask identifying bits of green component - * +48 UINT32 mask identifying bits of blue component - * +52 UINT32 mask identifying bits of alpha component - * +56 UINT32 color space type - * +60 UINT32 x coordinate of red endpoint - * +64 UINT32 y coordinate of red endpoint - * +68 UINT32 z coordinate of red endpoint - * +72 UINT32 x coordinate of green endpoint - * +76 UINT32 y coordinate of green endpoint - * +80 UINT32 z coordinate of green endpoint - * +84 UINT32 x coordinate of blue endpoint - * +88 UINT32 y coordinate of blue endpoint - * +92 UINT32 z coordinate of blue endpoint - * +96 UINT32 gamma red coordinate scale value - * +100 UINT32 gamma green coordinate scale value - * +104 UINT32 gamma blue coordinate scale value - */ - width = read_int32(data, 4); - height = read_int32(data, 8); - if ((width <= 0) || (height == 0)) - return BMP_DATA_ERROR; - if (height < 0) { - bmp->reversed = true; - uheight = -height; - } - /* ICOs only support 256*256 resolutions - * In the case of the ICO header, the height is actually the added - * height of XOR-Bitmap and AND-Bitmap (double the visible height) - * Technically we could remove this check and ICOs with bitmaps - * of any size could be processed; this is to conform to the spec. - */ - if (bmp->ico) { - if ((width > 256) || (height > 512)) { - return BMP_DATA_ERROR; - } else { - bmp->width = width; - bmp->height = height / 2; - } - } else { - bmp->width = width; - bmp->height = height; - } - if (read_uint16(data, 12) != 1) - return BMP_DATA_ERROR; - bmp->bpp = read_uint16(data, 14); - if (bmp->bpp == 0) - bmp->bpp = 8; - bmp->encoding = read_uint32(data, 16); - /** - * The bpp value should be in the range 1-32, but the only - * values considered legal are: - * RGB ENCODING: 1, 4, 8, 16, 24 and 32 - * RLE4 ENCODING: 4 - * RLE8 ENCODING: 8 - * BITFIELD ENCODING: 16 and 32 - */ - switch (bmp->encoding) { - case BMP_ENCODING_RGB: - if ((bmp->bpp != 1) && (bmp->bpp != 4) && - (bmp->bpp != 8) && - (bmp->bpp != 16) && - (bmp->bpp != 24) && - (bmp->bpp != 32)) - return BMP_DATA_ERROR; - break; - case BMP_ENCODING_RLE8: - if (bmp->bpp != 8) - return BMP_DATA_ERROR; - break; - case BMP_ENCODING_RLE4: - if (bmp->bpp != 4) - return BMP_DATA_ERROR; - break; - case BMP_ENCODING_BITFIELDS: - if ((bmp->bpp != 16) && (bmp->bpp != 32)) - return BMP_DATA_ERROR; - break; - /* invalid encoding */ - default: - return BMP_DATA_ERROR; - break; - } - /* Bitfield encoding means we have red, green, blue, and alpha masks. - * Here we aquire the masks and determine the required bit shift to - * align them in our 24-bit color 8-bit alpha format. - */ - if (bmp->encoding == BMP_ENCODING_BITFIELDS) { - if (header_size == 40) { - header_size += 12; - if (bmp->buffer_size < (14 + header_size)) - return BMP_INSUFFICIENT_DATA; - for (i = 0; i < 3; i++) - bmp->mask[i] = read_uint32(data, 40 + (i << 2)); - } else { - for (i = 0; i < 4; i++) - bmp->mask[i] = read_uint32(data, 40 + (i << 2)); - } - for (i = 0; i < 4; i++) { - if (bmp->mask[i] == 0) - break; - for (j = 31; j > 0; j--) - if (bmp->mask[i] & (1 << j)) { - if ((j - 7) > 0) - bmp->mask[i] &= 0xff << (j - 7); - else - bmp->mask[i] &= 0xff >> (-(j - 7)); - bmp->shift[i] = (i << 3) - (j - 7); - break; - } - } - } - bmp->colours = read_uint32(data, 32); - if (bmp->colours == 0) - bmp->colours = (1 << bmp->bpp); - palette_size = 4; - } - data += header_size; - - /* if there's no alpha mask, flag the bmp opaque */ - if ((!bmp->ico) && (bmp->mask[3] == 0)) { - flags |= BMP_OPAQUE; - bmp->opaque = true; - } - - /* we only have a palette for <16bpp */ - if (bmp->bpp < 16) { - /* we now have a series of palette entries of the format: - * - * +0 BYTE blue - * +1 BYTE green - * +2 BYTE red - * - * if the palette is from an OS/2 or Win2.x file then the entries - * are padded with an extra byte. - */ - - /* boundary checking */ - if (bmp->buffer_size < (14 + header_size + ((uint64_t)4 * bmp->colours))) - return BMP_INSUFFICIENT_DATA; - - /* create the colour table */ - bmp->colour_table = (uint32_t *)malloc(bmp->colours * 4); - if (!bmp->colour_table) - return BMP_INSUFFICIENT_MEMORY; - for (i = 0; i < bmp->colours; i++) { - bmp->colour_table[i] = data[2] | (data[1] << 8) | (data[0] << 16); - if (bmp->opaque) - bmp->colour_table[i] |= (0xff << 24); - data += palette_size; - } - } - - /* create our bitmap */ - flags |= BMP_NEW | BMP_CLEAR_MEMORY; - bmp->bitmap = bmp->bitmap_callbacks.bitmap_create(bmp->width, bmp->height, flags); - if (!bmp->bitmap) { - if (bmp->colour_table) - free(bmp->colour_table); - bmp->colour_table = NULL; - return BMP_INSUFFICIENT_MEMORY; - } - /* BMPs within ICOs don't have BMP file headers, so the image data should - * always be right after the colour table. - */ - if (bmp->ico) - bmp->bitmap_offset = (intptr_t)data - (intptr_t)bmp->bmp_data; - bmp->bitmap_callbacks.bitmap_set_suspendable(bmp->bitmap, bmp, bmp_invalidate); - return BMP_OK; -} - - -/** - * Finds the closest BMP within an ICO collection - * - * This function finds the BMP with dimensions as close to a specified set - * as possible from the images in the collection. - * - * \param ico the ICO collection to examine - * \param width the preferred width (0 to use ICO header width) - * \param height the preferred height (0 to use ICO header height) - */ -bmp_image *ico_find(ico_collection *ico, uint16_t width, uint16_t height) { - bmp_image *bmp = NULL; - ico_image *image; - int x, y, cur, distance = (1 << 24); - - if (width == 0) - width = ico->width; - if (height == 0) - height = ico->height; - for (image = ico->first; image; image = image->next) { - if ((image->bmp.width == width) && (image->bmp.height == height)) - return &image->bmp; - x = image->bmp.width - width; - y = image->bmp.height - height; - cur = (x * x) + (y * y); - if (cur < distance) { - distance = cur; - bmp = &image->bmp; - } - } - return bmp; -} - - -/** - * Invalidates a BMP - * - * This function sets the BMP into a state such that the bitmap image data - * can be released from memory. - * - * \param bmp the BMP image to invalidate - */ -static void bmp_invalidate(void *bitmap, void *private_word) { - bmp_image *bmp = (bmp_image *)private_word; - UNUSED(bitmap); - - bmp->decoded = false; -} - - -/** - * Decode a BMP - * - * This function decodes the BMP data such that bmp->bitmap is a valid - * image. The state of bmp->decoded is set to TRUE on exit such that it - * can easily be identified which BMPs are in a fully decoded state. - * - * \param bmp the BMP image to decode - * \return BMP_OK on success - */ -bmp_result bmp_decode(bmp_image *bmp) { - uint8_t *data; - uint32_t bytes; - bmp_result result = BMP_OK; - - assert(bmp->bitmap); - - data = bmp->bmp_data + bmp->bitmap_offset; - bytes = bmp->buffer_size - bmp->bitmap_offset; - - switch (bmp->encoding) { - case BMP_ENCODING_RGB: - if ((bmp->bpp == 24) || (bmp->bpp == 32)) - result = bmp_decode_rgb24(bmp, &data, bytes); - else if (bmp->bpp == 16) - result = bmp_decode_rgb16(bmp, &data, bytes); - else - result = bmp_decode_rgb(bmp, &data, bytes); - break; - case BMP_ENCODING_RLE8: - result = bmp_decode_rle(bmp, data, bytes, 8); - break; - case BMP_ENCODING_RLE4: - result = bmp_decode_rle(bmp, data, bytes, 4); - break; - case BMP_ENCODING_BITFIELDS: - if (bmp->bpp == 32) - result = bmp_decode_rgb24(bmp, &data, bytes); - else if (bmp->bpp == 16) - result = bmp_decode_rgb16(bmp, &data, bytes); - else - return BMP_DATA_ERROR; - } - - if ((!bmp->ico) || (result != BMP_OK)) - return result; - - bytes = (uintptr_t)bmp->bmp_data + bmp->buffer_size - (uintptr_t)data; - return bmp_decode_mask(bmp, data, bytes); -} - -/** - * Decode a BMP using "limited transparency" - * - * Bitmaps do not have native transparency support. However, there is a - * "trick" that is used in some instances in which the first pixel of the - * bitmap becomes the "transparency index". The decoding application can - * replace this index with whatever background colour it chooses to - * create the illusion of transparency. - * - * When to use transparency is at the discretion of the decoding - * application. - * - * \param bmp the BMP image to decode - * \param colour the colour to use as "transparent" - * \return BMP_OK on success - */ -bmp_result bmp_decode_trans(bmp_image *bmp, uint32_t colour) { - bmp->limited_trans = true; - bmp->trans_colour = colour; - return bmp_decode(bmp); -} - - -/** - * Decode BMP data stored in 24bpp colour. - * - * \param bmp the BMP image to decode - * \param start the data to decode, updated to last byte read on success - * \param bytes the number of bytes of data available - * \return BMP_OK on success - * BMP_INSUFFICIENT_DATA if the bitmap data ends unexpectedly; - * in this case, the image may be partially viewable - */ -static bmp_result bmp_decode_rgb24(bmp_image *bmp, uint8_t **start, int bytes) { - uint8_t *top, *bottom, *end, *data; - uint32_t *scanline; - uint32_t x, y; - uint32_t swidth, skip; - intptr_t addr; - uint8_t i; - uint32_t word; - - data = *start; - swidth = bmp->bitmap_callbacks.bitmap_get_bpp(bmp->bitmap) * bmp->width; - top = bmp->bitmap_callbacks.bitmap_get_buffer(bmp->bitmap); - if (!top) - return BMP_INSUFFICIENT_MEMORY; - bottom = top + (uint64_t)swidth * (bmp->height - 1); - end = data + bytes; - addr = ((intptr_t)data) & 3; - skip = bmp->bpp >> 3; - bmp->decoded = true; - - /* Determine transparent index */ - if (bmp->limited_trans) { - if ((data + skip) > end) - return BMP_INSUFFICIENT_DATA; - if (bmp->encoding == BMP_ENCODING_BITFIELDS) - bmp->transparent_index = read_uint32(data, 0); - else - bmp->transparent_index = data[2] | (data[1] << 8) | (data[0] << 16); - } - - for (y = 0; y < bmp->height; y++) { - while (addr != (((intptr_t)data) & 3)) - data++; - if ((data + (skip * bmp->width)) > end) - return BMP_INSUFFICIENT_DATA; - if (bmp->reversed) - scanline = (uint32_t *)(top + (y * swidth)); - else - scanline = (uint32_t *)(bottom - (y * swidth)); - if (bmp->encoding == BMP_ENCODING_BITFIELDS) { - for (x = 0; x < bmp->width; x++) { - word = read_uint32(data, 0); - for (i = 0; i < 4; i++) - if (bmp->shift[i] > 0) - scanline[x] |= ((word & bmp->mask[i]) << bmp->shift[i]); - else - scanline[x] |= ((word & bmp->mask[i]) >> (-bmp->shift[i])); - /* 32-bit BMPs have alpha masks, but sometimes they're not utilized */ - if (bmp->opaque) - scanline[x] |= (0xff << 24); - data += skip; - } - } else { - for (x = 0; x < bmp->width; x++) { - scanline[x] = data[2] | (data[1] << 8) | (data[0] << 16); - if ((bmp->limited_trans) && (scanline[x] == bmp->transparent_index)) - scanline[x] = bmp->trans_colour; - if (bmp->opaque) - scanline[x] |= (0xff << 24); - data += skip; - } - } - } - *start = data; - return BMP_OK; -} - - -/** - * Decode BMP data stored in 16bpp colour. - * - * \param bmp the BMP image to decode - * \param start the data to decode, updated to last byte read on success - * \param bytes the number of bytes of data available - * \return BMP_OK on success - * BMP_INSUFFICIENT_DATA if the bitmap data ends unexpectedly; - * in this case, the image may be partially viewable - */ -static bmp_result bmp_decode_rgb16(bmp_image *bmp, uint8_t **start, int bytes) { - uint8_t *top, *bottom, *end, *data; - uint32_t *scanline; - uint32_t x, y, swidth; - intptr_t addr; - uint8_t i; - uint16_t word; - - data = *start; - swidth = bmp->bitmap_callbacks.bitmap_get_bpp(bmp->bitmap) * bmp->width; - top = bmp->bitmap_callbacks.bitmap_get_buffer(bmp->bitmap); - if (!top) - return BMP_INSUFFICIENT_MEMORY; - bottom = top + (uint64_t)swidth * (bmp->height - 1); - end = data + bytes; - addr = ((intptr_t)data) & 3; - bmp->decoded = true; - - /* Determine transparent index */ - if (bmp->limited_trans) { - if ((data + 2) > end) - return BMP_INSUFFICIENT_DATA; - bmp->transparent_index = read_uint16(data, 0); - } - - for (y = 0; y < bmp->height; y++) { - while (addr != (((intptr_t)data) & 3)) - data += 2; - if ((data + (2 * bmp->width)) > end) - return BMP_INSUFFICIENT_DATA; - if (bmp->reversed) - scanline = (uint32_t *)(top + (y * swidth)); - else - scanline = (uint32_t *)(bottom - (y * swidth)); - if (bmp->encoding == BMP_ENCODING_BITFIELDS) { - for (x = 0; x < bmp->width; x++) { - word = read_uint16(data, 0); - if ((bmp->limited_trans) && (word == bmp->transparent_index)) - scanline[x] = bmp->trans_colour; - else { - scanline[x] = 0; - for (i = 0; i < 4; i++) - if (bmp->shift[i] > 0) - scanline[x] |= ((word & bmp->mask[i]) << bmp->shift[i]); - else - scanline[x] |= ((word & bmp->mask[i]) >> (-bmp->shift[i])); - if (bmp->opaque) - scanline[x] |= (0xff << 24); - } - data += 2; - } - } else { - for (x = 0; x < bmp->width; x++) { - word = read_uint16(data, 0); - if ((bmp->limited_trans) && (word == bmp->transparent_index)) - scanline[x] = bmp->trans_colour; - else { - /* 16-bit RGB defaults to RGB555 */ - scanline[x] = ((word & (31 << 0)) << 19) | - ((word & (31 << 5)) << 6) | - ((word & (31 << 10)) >> 7); - } - if (bmp->opaque) - scanline[x] |= (0xff << 24); - data += 2; - } - } - } - *start = data; - return BMP_OK; -} - - -/** - * Decode BMP data stored with a palette and in 8bpp colour or less. - * - * \param bmp the BMP image to decode - * \param start the data to decode, updated to last byte read on success - * \param bytes the number of bytes of data available - * \return BMP_OK on success - * BMP_INSUFFICIENT_DATA if the bitmap data ends unexpectedly; - * in this case, the image may be partially viewable - */ -static bmp_result bmp_decode_rgb(bmp_image *bmp, uint8_t **start, int bytes) { - uint8_t *top, *bottom, *end, *data; - uint32_t *scanline; - intptr_t addr; - uint32_t x, y, swidth; - uint8_t bit_shifts[8]; - uint8_t ppb = 8 / bmp->bpp; - uint8_t bit_mask = (1 << bmp->bpp) - 1; - uint8_t cur_byte = 0, bit, i; - - for (i = 0; i < ppb; i++) - bit_shifts[i] = 8 - ((i + 1) * bmp->bpp); - - data = *start; - swidth = bmp->bitmap_callbacks.bitmap_get_bpp(bmp->bitmap) * bmp->width; - top = bmp->bitmap_callbacks.bitmap_get_buffer(bmp->bitmap); - if (!top) - return BMP_INSUFFICIENT_MEMORY; - bottom = top + (uint64_t)swidth * (bmp->height - 1); - end = data + bytes; - addr = ((intptr_t)data) & 3; - bmp->decoded = true; - - /* Determine transparent index */ - if (bmp->limited_trans) - bmp->transparent_index = bmp->colour_table[(*data >> bit_shifts[0]) & bit_mask]; - - for (y = 0; y < bmp->height; y++) { - while (addr != (((intptr_t)data) & 3)) - data++; - bit = 8; - if ((data + (bmp->width / ppb)) > end) - return BMP_INSUFFICIENT_DATA; - if (bmp->reversed) - scanline = (unsigned int *)(top + (y * swidth)); - else - scanline = (unsigned int *)(bottom - (y * swidth)); - for (x = 0; x < bmp->width; x++) { - if (bit >= ppb) { - bit = 0; - cur_byte = *data++; - } - scanline[x] = bmp->colour_table[(cur_byte >> bit_shifts[bit++]) & bit_mask]; - if ((bmp->limited_trans) && (scanline[x] == bmp->transparent_index)) - scanline[x] = bmp->trans_colour; - } - } - *start = data; - return BMP_OK; -} - - -/** - * Decode a 1bpp mask for an ICO - * - * \param bmp the BMP image to decode - * \param data the data to decode - * \param bytes the number of bytes of data available - * \return BMP_OK on success - */ -static bmp_result bmp_decode_mask(bmp_image *bmp, uint8_t *data, int bytes) { - uint8_t *top, *bottom, *end; - uint32_t *scanline; - intptr_t addr; - uint32_t x, y, swidth; - uint32_t cur_byte = 0; - - swidth = bmp->bitmap_callbacks.bitmap_get_bpp(bmp->bitmap) * bmp->width; - top = bmp->bitmap_callbacks.bitmap_get_buffer(bmp->bitmap); - if (!top) - return BMP_INSUFFICIENT_MEMORY; - bottom = top + (uint64_t)swidth * (bmp->height - 1); - end = data + bytes; - addr = ((intptr_t)data) & 3; - - for (y = 0; y < bmp->height; y++) { - while (addr != (((intptr_t)data) & 3)) - data++; - if ((data + (bmp->width >> 3)) > end) - return BMP_INSUFFICIENT_DATA; - scanline = (uint32_t *)(bottom - (y * swidth)); - for (x = 0; x < bmp->width; x++) { - if ((x & 7) == 0) - cur_byte = *data++; - if ((cur_byte & 128) == 0) - scanline[x] |= (0xff << 24); - cur_byte = cur_byte << 1; - } - } - return BMP_OK; -} - - -/** - * Decode BMP data stored encoded in either RLE4 or RLE8. - * - * \param bmp the BMP image to decode - * \param data the data to decode - * \param bytes the number of bytes of data available - * \param size the size of the RLE tokens (4 or 8) - * \return BMP_OK on success - * BMP_INSUFFICIENT_DATA if the bitmap data ends unexpectedly; - * in this case, the image may be partially viewable - */ -static bmp_result bmp_decode_rle(bmp_image *bmp, uint8_t *data, int bytes, int size) { - uint8_t *top, *bottom, *end; - uint32_t *scanline; - uint32_t swidth; - uint32_t i, length, pixels_left; - uint32_t x = 0, y = 0, last_y = 0; - uint32_t pixel = 0, pixel2; - - if (bmp->ico) - return BMP_DATA_ERROR; - - swidth = bmp->bitmap_callbacks.bitmap_get_bpp(bmp->bitmap) * bmp->width; - top = bmp->bitmap_callbacks.bitmap_get_buffer(bmp->bitmap); - if (!top) - return BMP_INSUFFICIENT_MEMORY; - bottom = top + (uint64_t)swidth * (bmp->height - 1); - end = data + bytes; - bmp->decoded = true; - - do { - if (data + 2 > end) - return BMP_INSUFFICIENT_DATA; - length = *data++; - if (length == 0) { - length = *data++; - if (length == 0) { - /* 00 - 00 means end of scanline */ - x = 0; - if (last_y == y) { - if (++y > bmp->height) - return BMP_DATA_ERROR; - } - last_y = y; - } else if (length == 1) { - /* 00 - 01 means end of RLE data */ - return BMP_OK; - } else if (length == 2) { - /* 00 - 02 - XX - YY means move cursor */ - if (data + 2 > end) - return BMP_INSUFFICIENT_DATA; - x += *data++; - if (x >= bmp->width) - return BMP_DATA_ERROR; - y += *data++; - if (y >= bmp->height) - return BMP_DATA_ERROR; - } else { - /* 00 - NN means escape NN pixels */ - if (bmp->reversed) { - pixels_left = (y + 1) * bmp->width - x; - scanline = (unsigned int *)(top + (y * swidth)); - } else { - pixels_left = (bmp->height - y + 1) * bmp->width - x; - scanline = (unsigned int *)(bottom - (y * swidth)); - } - if (length > pixels_left) - length = pixels_left; - if (data + length > end) - return BMP_INSUFFICIENT_DATA; - - /* the following code could be easily optimised by simply - * checking the bounds on entry and using some simply copying - * routines if so */ - if (size == 8) { - for (i = 0; i < length; i++) { - if (x >= bmp->width) { - x = 0; - if (++y > bmp->height) - return BMP_DATA_ERROR; - scanline -= bmp->width; - } - scanline[x++] = bmp->colour_table[(int)*data++]; - } - } else { - for (i = 0; i < length; i++) { - if (x >= bmp->width) { - x = 0; - if (++y > bmp->height) - return BMP_DATA_ERROR; - scanline -= bmp->width; - } - if ((i & 1) == 0) { - pixel = *data++; - scanline[x++] = bmp->colour_table - [pixel >> 4]; - } else { - scanline[x++] = bmp->colour_table - [pixel & 0xf]; - } - } - length = (length + 1) >> 1; - } - if ((length & 1) && (*data++ != 0x00)) - return BMP_DATA_ERROR; - - } - } else { - /* NN means perform RLE for NN pixels */ - if (bmp->reversed) { - pixels_left = (y + 1) * bmp->width - x; - scanline = (unsigned int *)(top + (y * swidth)); - } else { - pixels_left = (bmp->height - y + 1) * bmp->width - x; - scanline = (unsigned int *)(bottom - (y * swidth)); - } - if (length > pixels_left) - length = pixels_left; - - /* boundary checking */ - if (data + 1 > end) - return BMP_INSUFFICIENT_DATA; - - /* the following code could be easily optimised by simply - * checking the bounds on entry and using some simply copying - * routines if so */ - if (size == 8) { - pixel = bmp->colour_table[(int)*data++]; - for (i = 0; i < length; i++) { - if (x >= bmp->width) { - x = 0; - if (++y > bmp->height) - return BMP_DATA_ERROR; - scanline -= bmp->width; - } - scanline[x++] = pixel; - } - } else { - pixel2 = *data++; - pixel = bmp->colour_table[pixel2 >> 4]; - pixel2 = bmp->colour_table[pixel2 & 0xf]; - for (i = 0; i < length; i++) { - if (x >= bmp->width) { - x = 0; - if (++y > bmp->height) - return BMP_DATA_ERROR; - scanline -= bmp->width; - } - if ((i & 1) == 0) - scanline[x++] = pixel; - else - scanline[x++] = pixel2; - } - } - } - } while (data < end); - return BMP_OK; -} - - -/** - * Finalise a BMP prior to destruction. - * - * \param bmp the BMP image to finalise - */ -void bmp_finalise(bmp_image *bmp) { - if (bmp->bitmap) - bmp->bitmap_callbacks.bitmap_destroy(bmp->bitmap); - bmp->bitmap = NULL; - if (bmp->colour_table) - free(bmp->colour_table); - bmp->colour_table = NULL; -} - - -/** - * Finalise an ICO prior to destruction. - * - * \param ico the ICO image to finalise - */ -void ico_finalise(ico_collection *ico) { - ico_image *image; - - for (image = ico->first; image; image = image->next) - bmp_finalise(&image->bmp); - while (ico->first) { - image = ico->first; - ico->first = image->next; - free(image); - } -} -- cgit v1.2.3