From a3015225c7d351a629cf0fca8662751afaf9055c Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Tue, 5 May 2009 22:10:06 +0000 Subject: [PATCH] Implement av_parse_color(). Originally committed as revision 18748 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavfilter/parseutils.c | 215 +++++++++++++++++++++++++++++++++++++++ libavfilter/parseutils.h | 10 ++ 2 files changed, 225 insertions(+) diff --git a/libavfilter/parseutils.c b/libavfilter/parseutils.c index 47f72ca8f0..656a67e164 100644 --- a/libavfilter/parseutils.c +++ b/libavfilter/parseutils.c @@ -61,6 +61,193 @@ char *av_get_token(const char **buf, const char *term) return ret; } +typedef struct { + const char *name; ///< a string representing the name of the color + uint8_t rgba_color[4]; ///< RGBA values for the color +} ColorEntry; + +static ColorEntry color_table[] = { + { "AliceBlue", { 0xF0, 0xF8, 0xFF } }, + { "AntiqueWhite", { 0xFA, 0xEB, 0xD7 } }, + { "Aqua", { 0x00, 0xFF, 0xFF } }, + { "Aquamarine", { 0x7F, 0xFF, 0xD4 } }, + { "Azure", { 0xF0, 0xFF, 0xFF } }, + { "Beige", { 0xF5, 0xF5, 0xDC } }, + { "Bisque", { 0xFF, 0xE4, 0xC4 } }, + { "Black", { 0x00, 0x00, 0x00 } }, + { "BlanchedAlmond", { 0xFF, 0xEB, 0xCD } }, + { "Blue", { 0x00, 0x00, 0xFF } }, + { "BlueViolet", { 0x8A, 0x2B, 0xE2 } }, + { "Brown", { 0xA5, 0x2A, 0x2A } }, + { "BurlyWood", { 0xDE, 0xB8, 0x87 } }, + { "CadetBlue", { 0x5F, 0x9E, 0xA0 } }, + { "Chartreuse", { 0x7F, 0xFF, 0x00 } }, + { "Chocolate", { 0xD2, 0x69, 0x1E } }, + { "Coral", { 0xFF, 0x7F, 0x50 } }, + { "CornflowerBlue", { 0x64, 0x95, 0xED } }, + { "Cornsilk", { 0xFF, 0xF8, 0xDC } }, + { "Crimson", { 0xDC, 0x14, 0x3C } }, + { "Cyan", { 0x00, 0xFF, 0xFF } }, + { "DarkBlue", { 0x00, 0x00, 0x8B } }, + { "DarkCyan", { 0x00, 0x8B, 0x8B } }, + { "DarkGoldenRod", { 0xB8, 0x86, 0x0B } }, + { "DarkGray", { 0xA9, 0xA9, 0xA9 } }, + { "DarkGreen", { 0x00, 0x64, 0x00 } }, + { "DarkKhaki", { 0xBD, 0xB7, 0x6B } }, + { "DarkMagenta", { 0x8B, 0x00, 0x8B } }, + { "DarkOliveGreen", { 0x55, 0x6B, 0x2F } }, + { "Darkorange", { 0xFF, 0x8C, 0x00 } }, + { "DarkOrchid", { 0x99, 0x32, 0xCC } }, + { "DarkRed", { 0x8B, 0x00, 0x00 } }, + { "DarkSalmon", { 0xE9, 0x96, 0x7A } }, + { "DarkSeaGreen", { 0x8F, 0xBC, 0x8F } }, + { "DarkSlateBlue", { 0x48, 0x3D, 0x8B } }, + { "DarkSlateGray", { 0x2F, 0x4F, 0x4F } }, + { "DarkTurquoise", { 0x00, 0xCE, 0xD1 } }, + { "DarkViolet", { 0x94, 0x00, 0xD3 } }, + { "DeepPink", { 0xFF, 0x14, 0x93 } }, + { "DeepSkyBlue", { 0x00, 0xBF, 0xFF } }, + { "DimGray", { 0x69, 0x69, 0x69 } }, + { "DodgerBlue", { 0x1E, 0x90, 0xFF } }, + { "FireBrick", { 0xB2, 0x22, 0x22 } }, + { "FloralWhite", { 0xFF, 0xFA, 0xF0 } }, + { "ForestGreen", { 0x22, 0x8B, 0x22 } }, + { "Fuchsia", { 0xFF, 0x00, 0xFF } }, + { "Gainsboro", { 0xDC, 0xDC, 0xDC } }, + { "GhostWhite", { 0xF8, 0xF8, 0xFF } }, + { "Gold", { 0xFF, 0xD7, 0x00 } }, + { "GoldenRod", { 0xDA, 0xA5, 0x20 } }, + { "Gray", { 0x80, 0x80, 0x80 } }, + { "Green", { 0x00, 0x80, 0x00 } }, + { "GreenYellow", { 0xAD, 0xFF, 0x2F } }, + { "HoneyDew", { 0xF0, 0xFF, 0xF0 } }, + { "HotPink", { 0xFF, 0x69, 0xB4 } }, + { "IndianRed", { 0xCD, 0x5C, 0x5C } }, + { "Indigo", { 0x4B, 0x00, 0x82 } }, + { "Ivory", { 0xFF, 0xFF, 0xF0 } }, + { "Khaki", { 0xF0, 0xE6, 0x8C } }, + { "Lavender", { 0xE6, 0xE6, 0xFA } }, + { "LavenderBlush", { 0xFF, 0xF0, 0xF5 } }, + { "LawnGreen", { 0x7C, 0xFC, 0x00 } }, + { "LemonChiffon", { 0xFF, 0xFA, 0xCD } }, + { "LightBlue", { 0xAD, 0xD8, 0xE6 } }, + { "LightCoral", { 0xF0, 0x80, 0x80 } }, + { "LightCyan", { 0xE0, 0xFF, 0xFF } }, + { "LightGoldenRodYellow", { 0xFA, 0xFA, 0xD2 } }, + { "LightGrey", { 0xD3, 0xD3, 0xD3 } }, + { "LightGreen", { 0x90, 0xEE, 0x90 } }, + { "LightPink", { 0xFF, 0xB6, 0xC1 } }, + { "LightSalmon", { 0xFF, 0xA0, 0x7A } }, + { "LightSeaGreen", { 0x20, 0xB2, 0xAA } }, + { "LightSkyBlue", { 0x87, 0xCE, 0xFA } }, + { "LightSlateGray", { 0x77, 0x88, 0x99 } }, + { "LightSteelBlue", { 0xB0, 0xC4, 0xDE } }, + { "LightYellow", { 0xFF, 0xFF, 0xE0 } }, + { "Lime", { 0x00, 0xFF, 0x00 } }, + { "LimeGreen", { 0x32, 0xCD, 0x32 } }, + { "Linen", { 0xFA, 0xF0, 0xE6 } }, + { "Magenta", { 0xFF, 0x00, 0xFF } }, + { "Maroon", { 0x80, 0x00, 0x00 } }, + { "MediumAquaMarine", { 0x66, 0xCD, 0xAA } }, + { "MediumBlue", { 0x00, 0x00, 0xCD } }, + { "MediumOrchid", { 0xBA, 0x55, 0xD3 } }, + { "MediumPurple", { 0x93, 0x70, 0xD8 } }, + { "MediumSeaGreen", { 0x3C, 0xB3, 0x71 } }, + { "MediumSlateBlue", { 0x7B, 0x68, 0xEE } }, + { "MediumSpringGreen", { 0x00, 0xFA, 0x9A } }, + { "MediumTurquoise", { 0x48, 0xD1, 0xCC } }, + { "MediumVioletRed", { 0xC7, 0x15, 0x85 } }, + { "MidnightBlue", { 0x19, 0x19, 0x70 } }, + { "MintCream", { 0xF5, 0xFF, 0xFA } }, + { "MistyRose", { 0xFF, 0xE4, 0xE1 } }, + { "Moccasin", { 0xFF, 0xE4, 0xB5 } }, + { "NavajoWhite", { 0xFF, 0xDE, 0xAD } }, + { "Navy", { 0x00, 0x00, 0x80 } }, + { "OldLace", { 0xFD, 0xF5, 0xE6 } }, + { "Olive", { 0x80, 0x80, 0x00 } }, + { "OliveDrab", { 0x6B, 0x8E, 0x23 } }, + { "Orange", { 0xFF, 0xA5, 0x00 } }, + { "OrangeRed", { 0xFF, 0x45, 0x00 } }, + { "Orchid", { 0xDA, 0x70, 0xD6 } }, + { "PaleGoldenRod", { 0xEE, 0xE8, 0xAA } }, + { "PaleGreen", { 0x98, 0xFB, 0x98 } }, + { "PaleTurquoise", { 0xAF, 0xEE, 0xEE } }, + { "PaleVioletRed", { 0xD8, 0x70, 0x93 } }, + { "PapayaWhip", { 0xFF, 0xEF, 0xD5 } }, + { "PeachPuff", { 0xFF, 0xDA, 0xB9 } }, + { "Peru", { 0xCD, 0x85, 0x3F } }, + { "Pink", { 0xFF, 0xC0, 0xCB } }, + { "Plum", { 0xDD, 0xA0, 0xDD } }, + { "PowderBlue", { 0xB0, 0xE0, 0xE6 } }, + { "Purple", { 0x80, 0x00, 0x80 } }, + { "Red", { 0xFF, 0x00, 0x00 } }, + { "RosyBrown", { 0xBC, 0x8F, 0x8F } }, + { "RoyalBlue", { 0x41, 0x69, 0xE1 } }, + { "SaddleBrown", { 0x8B, 0x45, 0x13 } }, + { "Salmon", { 0xFA, 0x80, 0x72 } }, + { "SandyBrown", { 0xF4, 0xA4, 0x60 } }, + { "SeaGreen", { 0x2E, 0x8B, 0x57 } }, + { "SeaShell", { 0xFF, 0xF5, 0xEE } }, + { "Sienna", { 0xA0, 0x52, 0x2D } }, + { "Silver", { 0xC0, 0xC0, 0xC0 } }, + { "SkyBlue", { 0x87, 0xCE, 0xEB } }, + { "SlateBlue", { 0x6A, 0x5A, 0xCD } }, + { "SlateGray", { 0x70, 0x80, 0x90 } }, + { "Snow", { 0xFF, 0xFA, 0xFA } }, + { "SpringGreen", { 0x00, 0xFF, 0x7F } }, + { "SteelBlue", { 0x46, 0x82, 0xB4 } }, + { "Tan", { 0xD2, 0xB4, 0x8C } }, + { "Teal", { 0x00, 0x80, 0x80 } }, + { "Thistle", { 0xD8, 0xBF, 0xD8 } }, + { "Tomato", { 0xFF, 0x63, 0x47 } }, + { "Turquoise", { 0x40, 0xE0, 0xD0 } }, + { "Violet", { 0xEE, 0x82, 0xEE } }, + { "Wheat", { 0xF5, 0xDE, 0xB3 } }, + { "White", { 0xFF, 0xFF, 0xFF } }, + { "WhiteSmoke", { 0xF5, 0xF5, 0xF5 } }, + { "Yellow", { 0xFF, 0xFF, 0x00 } }, + { "YellowGreen", { 0x9A, 0xCD, 0x32 } }, +}; + +static int color_table_compare(const void *lhs, const void *rhs) +{ + return strcmp(lhs, ((const ColorEntry *)rhs)->name); +} + +int av_parse_color(uint8_t *rgba_color, const char *color_string, void *log_ctx) +{ + if (!strncmp(color_string, "0x", 2)) { + char *tail; + int len = strlen(color_string); + int rgba = strtol(color_string, &tail, 16); + + if (*tail || (len != 8 && len != 10)) { + av_log(log_ctx, AV_LOG_ERROR, "Invalid 0xRRGGBB[AA] color string: '%s'\n", color_string); + return -1; + } + if (len == 10) { + rgba_color[3] = rgba; + rgba >>= 8; + } + rgba_color[0] = rgba >> 16; + rgba_color[1] = rgba >> 8; + rgba_color[2] = rgba; + } else { + const ColorEntry *entry = bsearch(color_string, + color_table, + FF_ARRAY_ELEMS(color_table), + sizeof(ColorEntry), + color_table_compare); + if (!entry) { + av_log(log_ctx, AV_LOG_DEBUG, "Cannot find color '%s'\n", color_string); + return -1; + } + memcpy(rgba_color, entry->rgba_color, 4); + } + + return 0; +} + #ifdef TEST #undef printf @@ -104,6 +291,34 @@ int main(void) printf(" + |%s|\n", p); } + printf("\nTesting av_parse_color()\n"); + { + uint8_t rgba[4]; + const char *color_names[] = { + "foo", + "red", + "Red ", + "RED", + "Violet", + "Yellow", + "Red", + "0x000000", + "0x0000000", + "0x3e34ff", + "0x3e34ffaa", + "0xffXXee", + "0xfoobar", + "0xffffeeeeeeee", + }; + + av_log_set_level(AV_LOG_DEBUG); + + for (int i = 0; i < FF_ARRAY_ELEMS(color_names); i++) { + if (av_parse_color(rgba, color_names[i], NULL) >= 0) + printf("%s -> R(%d) G(%d) B(%d) A(%d)\n", color_names[i], rgba[0], rgba[1], rgba[2], rgba[3]); + } + } + return 0; } diff --git a/libavfilter/parseutils.h b/libavfilter/parseutils.h index 60092cc845..895c5067aa 100644 --- a/libavfilter/parseutils.h +++ b/libavfilter/parseutils.h @@ -40,4 +40,14 @@ */ char *av_get_token(const char **buf, const char *term); +/** + * Puts the RGBA values that correspond to color_string in rgba_color. + * + * @param color_string a string specifying a color. It can be the name of + * a color or a 0xRRGGBB[AA] sequence. + * @return >= 0 in case of success, a negative value in case of + * failure (for example if color_string cannot be parsed). + */ +int av_parse_color(uint8_t *rgba_color, const char *color_string, void *log_ctx); + #endif /* AVFILTER_PARSEUTILS_H */