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FS-7506: improve draw_text with minimum anti aliasing

This commit is contained in:
Seven Du 2015-02-11 12:40:07 +08:00 committed by Michael Jerris
parent 8a1cb14015
commit c857be4547
2 changed files with 39 additions and 12 deletions
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2
src/include/switch_core_video.h
View File

@ -183,7 +183,7 @@ SWITCH_DECLARE(void) switch_img_flip(switch_image_t *img);
*/
SWITCH_DECLARE(void) switch_img_free(switch_image_t **img);
SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *IMG, int x, int y, char *text);
SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *IMG, int x, int y, switch_yuv_color_t color, uint16_t font_size, char *text);
SWITCH_DECLARE(void) switch_img_add_text(void *buffer, int w, int x, int y, char *s);

49
src/mod/applications/mod_conference/mod_conference.c
View File

@ -736,19 +736,31 @@ static void draw_bitmap(switch_image_t *img, FT_Bitmap* bitmap, FT_Int x, FT_Int
FT_Int x_max = x + bitmap->width;
FT_Int y_max = y + bitmap->rows;
switch (bitmap->pixel_mode) {
case FT_PIXEL_MODE_GRAY: // it should always be GRAY since we use FT_LOAD_RENDER?
break;
case FT_PIXEL_MODE_NONE:
case FT_PIXEL_MODE_MONO:
case FT_PIXEL_MODE_GRAY2:
case FT_PIXEL_MODE_GRAY4:
case FT_PIXEL_MODE_LCD:
case FT_PIXEL_MODE_LCD_V:
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "unsupported pixel mode %d\n", bitmap->pixel_mode);
return;
}
for ( i = x, p = 0; i < x_max; i++, p++ ) {
for ( j = y, q = 0; j < y_max; j++, q++ ) {
if ( i < 0 || j < 0 || i >= img->d_w || j >= img->d_h) continue;
if (bitmap->buffer[q * bitmap->width + p]) {
// TODO the value ranges from 1 - 255, maybe we should reset the color based on that
if (bitmap->buffer[q * bitmap->width + p] > 128) {
switch_image_draw_pixel(img, i, j, color);
}
}
}
}
SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *img, int x, int y, char *text)
SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *img, int x, int y, switch_yuv_color_t color, uint16_t font_size, char *text)
{
FT_Library library;
FT_Face face;
@ -756,16 +768,14 @@ SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *img, int x, int y, cha
FT_Matrix matrix; /* transformation matrix */
FT_Vector pen; /* untransformed origin */
FT_Error error;
char* font_family = "/usr/local/freeswitch/SimHei.ttf";
int font_size = 64;
// char* font_family = "/usr/local/freeswitch/SimHei.ttf";
char* font_family = "/usr/local/freeswitch/Arial.ttf";
double angle;
int target_height;
int index = 0;
FT_ULong ch;
switch_yuv_color_t color;
if (zstr(text)) return;
switch_color_set(&color, "#FFFFFF");
angle = 0; // (45.0 / 360 ) * 3.14159 * 2;
target_height = img->d_h;
@ -777,7 +787,7 @@ SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *img, int x, int y, cha
if (error) return;
/* use 50pt at 100dpi */
error = FT_Set_Char_Size(face, 50 * font_size, 0, 100, 0); /* set character size */
error = FT_Set_Char_Size(face, 64 * font_size, 0, 96, 96); /* set character size */
if (error) return;
slot = face->glyph;
@ -788,14 +798,18 @@ SWITCH_DECLARE(void) switch_img_draw_text(switch_image_t *img, int x, int y, cha
matrix.yx = (FT_Fixed)( sin( angle ) * 0x10000L );
matrix.yy = (FT_Fixed)( cos( angle ) * 0x10000L );
/* the pen position in 26.6 cartesian space coordinates; */
/* start at (300,200) relative to the upper left corner */
pen.x = x * 64;
pen.y = (target_height - y) * 64;
while(*(text + index)) {
ch = get_utf8_char(text, &index);
if (ch == '\n') {
pen.x = x * 64;
pen.y -= (font_size + font_size / 4) * 64;
continue;
}
/* set transformation */
FT_Set_Transform(face, &matrix, &pen);
@ -1561,7 +1575,15 @@ static void *SWITCH_THREAD_FUNC conference_video_muxing_thread_run(switch_thread
}
}
// switch_img_draw_text(conference->canvas->img, 10, 10, "AVA 123 你好 FreeSWITCH");
if (1) {
switch_yuv_color_t color;
switch_color_set(&color, "#FFFFFF");
switch_img_draw_text(conference->canvas->img, 10, 10, color, 12, "AVA 123 你好 FreeSWITCH\nFreeSWITCH Rocks!");
switch_img_draw_text(conference->canvas->img, 10, 40, color, 16, "AVA 123 你好 FreeSWITCH\nFreeSWITCH Rocks!");
switch_img_draw_text(conference->canvas->img, 10, 80, color, 24, "AVA 123 你好 FreeSWITCH\nFreeSWITCH Rocks!");
switch_img_draw_text(conference->canvas->img, 10, 160, color, 36, "AVA 123 你好 FreeSWITCH\nFreeSWITCH Rocks!");
switch_img_draw_text(conference->canvas->img, 10, 300, color, 72, "AVA 123 你好 FreeSWITCH\nFreeSWITCH Rocks!");
}
if (used) {
switch_time_t now = switch_micro_time_now();
@ -7759,6 +7781,11 @@ static switch_status_t conf_api_sub_vid_layout(conference_obj_t *conference, swi
return SWITCH_STATUS_SUCCESS;
}
if (!conference->canvas) {
stream->write_function(stream, "Conference is not in mixing mode\n");
return SWITCH_STATUS_SUCCESS;
}
if (!strcasecmp(argv[2], "group")) {
layout_group_t *lg = NULL;