Everywhere: Changes to @html_dom_node and TrueType API
CSS properties fontFamily and fontSize are part of @html_dom_node now, and the TrueType API only accepts I32 code point streams, so we have to preprocess UTF-8 streams before rendering text.
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df0adc0a15
4 changed files with 130 additions and 22 deletions
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@ -1171,7 +1171,7 @@ I64 @get_truetype_text_width(U8* font_name, I64 size, U8* text)
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I64 res = 0;
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CDC* dc = DCNew(Display.Width(), (size * 2));
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Free(dc->body);
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dc->body = @stbtt_RenderText(font, dc->width_internal, dc->height, ToI64(size * 1.5), text);
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dc->body = @stbtt_RenderText(font, dc->width_internal, dc->height, ToI64(size * 1.2), text);
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res = X2Pos(dc) - X1Pos(dc);
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DCDel(dc);
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return res;
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@ -1186,7 +1186,7 @@ U0 Text2D(Context2D* ctx, U8* font_name, I64 x, I64 y, I64 size, U32 color, U8*
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Context2D* text_ctx = NewContext2D(ctx->width, ctx->height);
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CDC* dc = DCNew(ctx->width, ctx->height);
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Free(dc->body);
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dc->body = @stbtt_RenderText(font, dc->width_internal, dc->height, ToI64(size * 1.5), text);
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dc->body = @stbtt_RenderText(font, dc->width_internal, dc->height, ToI64(size * 1.2), text);
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I64 text_x, text_y, text_c;
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for (text_y = 0; text_y < dc->height; text_y++) {
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for (text_x = 0; text_x < dc->width; text_x++) {
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@ -247,12 +247,16 @@ Bool @render_css_for_node(@html_dom_node* node, HtmlRenderer* renderer)
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I64 color = TRANSPARENT;
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U8 node_ptr_string[32];
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U8* tmpmd5;
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U8* match_font_family;
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JsonKey* font_key;
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if (!node)
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return FALSE;
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if (node->parentNode) {
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node->backgroundColor = node->parentNode->backgroundColor;
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node->color = node->parentNode->color;
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node->fontFamily = node->parentNode->fontFamily;
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node->fontSize = node->parentNode->fontSize;
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}
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for (i = 0; i < renderer->css_rules->length; i++) {
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@ -366,15 +370,34 @@ Bool @render_css_for_node(@html_dom_node* node, HtmlRenderer* renderer)
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if (!StrICmp(key->name, "line-height") && !StrICmp(values->@(0) + StrLen(values->@(0)) - 2, "px")) {
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StrCpy(node_tmpnum_buf, values->@(0));
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node_tmpnum_buf[StrLen(node_tmpnum_buf) - 2] = NULL;
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node->font_size = ToI64((Str2I64(node_tmpnum_buf) / 3) * 2);
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node->fontSize = ToI64((Str2I64(node_tmpnum_buf) / 3) * 2);
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}
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if (!StrICmp(key->name, "font-size") && !StrICmp(values->@(0) + StrLen(values->@(0)) - 2, "px")) {
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StrCpy(node_tmpnum_buf, values->@(0));
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node_tmpnum_buf[StrLen(node_tmpnum_buf) - 2] = NULL;
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node->font_size = Str2I64(node_tmpnum_buf);
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node->fontSize = Str2I64(node_tmpnum_buf);
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}
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if (!StrICmp(key->name, "font-family")) {
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for (k = 0; k < values->length; k++) {
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match_font_family = values->@(k);
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String.Trim(match_font_family);
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String.Trim(match_font_family, '"');
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font_key = Fonts->keys;
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while (font_key) {
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if (!StrICmp(font_key->name, match_font_family)) {
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node->fontFamily = font_key->name;
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goto css_continue_to_next_property;
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}
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font_key = font_key->next;
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}
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"\n";
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}
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}
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css_continue_to_next_property:
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key = key->next;
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}
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}
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@ -562,42 +585,124 @@ U0 @render_form_element(@html_dom_node* node, HtmlRenderer* renderer)
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JsonArray* parent_nodes_excluded_from_text_rendering = Json.Parse("[\"option\",\"script\",\"style\",\"title\"]", erythros_mem_task);
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JsonArray* block_level_element_tag_names = Json.Parse("[\"address\",\"article\",\"aside\",\"blockquote\",\"br\",\"canvas\",\"dd\",\"div\",\"dl\",\"dt\",\"fieldset\",\"figcaption\",\"figure\",\"footer\",\"form\",\"h1\",\"h2\",\"h3\",\"h4\",\"h5\",\"h6\",\"header\",\"hr\",\"li\",\"main\",\"nav\",\"noscript\",\"ol\",\"p\",\"pre\",\"section\",\"table\",\"tfoot\",\"ul\",\"video\"]", erythros_mem_task);
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#define ADD_BYTE_TO_CODE_POINT_VALUE code_point = ((code_point << 6) | text[++i] & 0x3f);
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#define ADD_TWO_BYTES_TO_CODE_POINT_VALUE ADD_BYTE_TO_CODE_POINT_VALUE ADD_BYTE_TO_CODE_POINT_VALUE
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#define ADD_THREE_BYTES_TO_CODE_POINT_VALUE ADD_TWO_BYTES_TO_CODE_POINT_VALUE ADD_BYTE_TO_CODE_POINT_VALUE
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I32* @I32_text_stream_from_utf8(U8* text, I64* count)
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{
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if (!text || !StrLen(text))
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return NULL;
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I64 i = 0;
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I32 ch;
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I32 code_point;
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I32* stream = CAlloc((StrLen(text) + 1) * sizeof(I32), erythros_mem_task);
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while (ch = text[i]) {
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if (ch < 0x80) {
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stream[i] = ch;
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goto @parse_next_utf8_byte;
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}
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if (ch & 0xf0 == 0xf0) {
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code_point = ch & 0x7;
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ADD_THREE_BYTES_TO_CODE_POINT_VALUE
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} else if (ch & 0xe0 == 0xe0) {
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code_point = ch & 0xf;
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ADD_TWO_BYTES_TO_CODE_POINT_VALUE
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} else if (ch & 0xc0 == 0xc0) {
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code_point = ch & 0x1f;
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ADD_BYTE_TO_CODE_POINT_VALUE
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} else {
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code_point = '?'; // Invalid character
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goto @parse_next_utf8_byte;
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}
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stream[i] = code_point;
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@parse_next_utf8_byte : ++i;
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}
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*count = i;
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return stream;
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}
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Bool @code_point_is_whitespace(I32 code_point)
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{
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switch (code_point) {
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case 0x09...0x0d:
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case 0x20:
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case 0x85:
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case 0xa0:
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case 0x1680:
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case 0x2000...0x200a:
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case 0x2028:
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case 0x2029:
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case 0x202f:
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case 0x205f:
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case 0x3000:
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return TRUE;
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default:
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return FALSE;
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}
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}
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U0 @render_node_text(@html_dom_node* node, HtmlRenderer* renderer)
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{
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if (!@html_text_is_printable_ascii(node->text)) {
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// FIXME: Wire up UTF-8 handling for non-ASCII characters
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if (!node || !renderer || !node->text || !StrLen(node->text))
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return;
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}
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I64 background_color = Color(255, 255, 255); // FIXME: Alpha blend into rect beneath fragment in z-index
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I64 default_font_size = 16; // FIXME: Derive this
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U8* font_name = "Free Serif"; // FIXME: Derive this
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I64 font_size = @t(node->parentNode->font_size, node->parentNode->font_size, default_font_size);
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I64 text_width;
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U8* fragments = StrNew(node->text);
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I64 i, j;
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// Convert all the code points to I32
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I64 code_point_count = 0;
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I64 code_point_offset = 0;
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I32* stream = @I32_text_stream_from_utf8(node->text, &code_point_count);
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// L-R Trim all the whitespace code points
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while (stream[code_point_offset] && @code_point_is_whitespace(stream[code_point_offset]))
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++code_point_offset;
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while (@code_point_is_whitespace(stream[code_point_offset + code_point_count - 1]))
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--code_point_count;
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// Get the fragment count
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I64 fragment_count = 0;
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U8** fragment = String.Split(fragments, ' ', &fragment_count);
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I64 i;
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for (i = code_point_offset; i < code_point_count; i++) {
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if (@code_point_is_whitespace(stream[i]))
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++fragment_count;
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}
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++fragment_count;
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// Calculate fragment pointers and NULL terminate fragments
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I32** fragments = CAlloc(sizeof(I32*) * (fragment_count));
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I64 fragment_base = code_point_offset;
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j = 0;
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for (i = code_point_offset; i < code_point_count; i++) {
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if (@code_point_is_whitespace(stream[i])) {
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fragments[j] = &stream[fragment_base];
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stream[i] = NULL;
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fragment_base = i + 1;
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++j;
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}
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}
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fragments[j] = &stream[fragment_base];
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stream[i] = NULL;
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fragment_base = i + 1;
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I64 text_width;
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Context2DWidget* fragment_widget;
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I64 last_fragment_pos = 0;
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for (i = 0; i < fragment_count; i++) {
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if (fragment[i] && *fragment[i]) {
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last_fragment_pos = i;
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text_width = @get_truetype_text_width(font_name, font_size, fragment[i]);
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if (fragments[i] && *fragments[i]) {
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text_width = @get_truetype_text_width(node->parentNode->fontFamily, node->parentNode->fontSize, fragments[i]);
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if (text_width) {
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text_width += 4;
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fragment_widget = Gui.CreateWidget(renderer->win, WIDGET_TYPE_CONTEXT2D,
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U64_MAX, U64_MAX, 0, 0);
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fragment_widget->data = node;
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fragment_widget->ctx = NewContext2D(text_width, ToI64(font_size * 1.5))->fill(node->parentNode->backgroundColor)->text(font_name, 0, 0, font_size, node->parentNode->color, fragment[i]);
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fragment_widget->ctx = NewContext2D(text_width, ToI64(node->parentNode->fontSize * 1.2))->fill(node->parentNode->backgroundColor)->text(node->parentNode->fontFamily, 0, 0, node->parentNode->fontSize, node->parentNode->color, fragments[i]);
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fragment_widget->width = fragment_widget->ctx->width;
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fragment_widget->height = fragment_widget->ctx->height;
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}
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}
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}
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Free(fragments);
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Free(stream);
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}
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U0 @renderer_append_image(HtmlRenderer* renderer, Context2DWidget* widget)
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@ -626,7 +731,7 @@ U0 @render_node_list(@html_dom_node* node, HtmlRenderer* renderer)
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I64 margin_top = 32; // FIXME: Derive these
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I64 margin_bottom = 32;
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if (StrICmp(node->tagName, "InternalTextNode") || !parent_nodes_excluded_from_text_rendering->contains(node->tagName))
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if (StrICmp(node->tagName, "InternalTextNode"))
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if (!@render_css_for_node(node, renderer))
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return;
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@ -95,7 +95,7 @@ class @html_dom_node : JsonElement
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U32 backgroundColor;
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U32 color;
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U8* fontFamily;
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I64 font_size;
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I64 fontSize;
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Bool display_block;
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};
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