Use SDL_FontCache for text rendering

CMakeLists.txt

@@ -29,6 +29,8 @@ add_executable(${PROJECT_NAME}
         src/gui/SDLControllerWiiUGamepad.h
         src/gui/SDLControllerWiiUProContoller.h
         src/gui/GuiTexture.cpp src/gui/GuiTexture.h
+        src/gui/SDL_FontCache.h src/gui/SDL_FontCache.c
+
         )
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/sdl2)

src/MainWindow.cpp

@@ -1,4 +1,5 @@
 #include "MainWindow.h"
+#include "gui/SDL_FontCache.h"
 
 MainWindow::~MainWindow() {
     delete label;;
@@ -30,9 +31,10 @@ MainWindow::MainWindow(int32_t w, int32_t h) : GuiFrame(w, h) {
 
     TTF_Init();
     TTF_Font *font;
-    font = TTF_OpenFont(font_path, 35);
 
-    label = new GuiText("This is a test AVAVAVVAVA", 25, {255, 255, 0, 255}, font);
+    font = TTF_OpenFont(font_path, 28);
+
+    label = new GuiText("This is a test.This is a test. This is a test.This is a test.This is a test.This is a test.", 25, {255, 255, 0, 255}, font);
 
     bgMusic = new GuiSound(bgMusic_path);
     bgMusic->SetLoop(true);
@@ -69,6 +71,7 @@ MainWindow::MainWindow(int32_t w, int32_t h) : GuiFrame(w, h) {
     button->setEffectGrow();
     label->setAlignment(ALIGN_CENTERED);
     button->setLabel(label);
+    label->setMaxWidth(button->getWidth());
     button->setSoundClick(sound);
 
     button->clicked.connect(this, &MainWindow::test);

src/gui/GuiText.cpp

@@ -19,6 +19,7 @@
 #include "GuiText.h"
 #include "../CVideo.h"
 #include "../logger.h"
+#include "SDL_FontCache.h"
 
 
 /**
@@ -26,65 +27,52 @@
  */
 
 GuiText::GuiText(const std::string& text, int32_t s, SDL_Color c, TTF_Font* gFont) {
-    //Render text surface
+   this->text = text;
-    textSurface = TTF_RenderText_Solid( gFont, text.c_str(), c );
+   this->size = s;
-    if( textSurface == NULL )    {
+   this->color = c;
-        DEBUG_FUNCTION_LINE( "Unable to render text surface! SDL_ttf Error: %s\n", TTF_GetError() );
+   this->ttf_font = gFont;
-    }
+   this->invalid = true;
-
+   this->updateText = true;
+   this->maxWidth = 200;
 }
 
 GuiText::~GuiText(){
-    if(textSurface){
+    if(fc_font){
-        SDL_FreeSurface( textSurface );
+        FC_FreeFont(fc_font);
-        textSurface = nullptr;
+        fc_font = nullptr;
-
-    }
-
-    if(textTexture){
-        SDL_DestroyTexture( textTexture );
-        textTexture = nullptr;
     }
 }
 
-/**
- * Draw the text on screen
- */
 void GuiText::draw(CVideo *pVideo) {
     if (!this->isVisible()) {
         return;
     }
-
+    if(invalid){
-    if(textTexture == NULL){
+        if(fc_font){
-    //Create texture from surface pixels
+            FC_FreeFont(fc_font);
-    textTexture = SDL_CreateTextureFromSurface( pVideo->getRenderer(), textSurface );
+            fc_font = nullptr;
-    if( textTexture == NULL ) {
+        }
-        DEBUG_FUNCTION_LINE( "Unable to create texture from rendered text! SDL Error: %s\n", SDL_GetError() );
+        fc_font = FC_CreateFont();
-    }else{
+        invalid = !FC_LoadFontFromTTF(fc_font, pVideo->getRenderer(), this->ttf_font, color);
-        width = textSurface->w;
+        DEBUG_FUNCTION_LINE("FC_CACHE init done");
-        height = textSurface->h;
     }
 
-    if(textSurface){
+    FC_DrawColumnScale(fc_font, pVideo->getRenderer(), getLeft(), getTop(), maxWidth * getScaleX(), {getScaleX(), getScaleY()}, text.c_str());
-        SDL_FreeSurface( textSurface );
+}
-        textSurface = nullptr;
+
+void GuiText::process() {
+    GuiElement::process();
+
+    if(updateText && fc_font){
+        auto height = FC_GetColumnHeight(fc_font, maxWidth, text.c_str());
+        auto width = FC_GetWidth(fc_font, text.c_str());
+        width = width > maxWidth ? maxWidth : width;
+        DEBUG_FUNCTION_LINE("width %d height %d", width, height);
+        this->setSize(width, height);
+        updateText = false;
     }
 }
 
-    if(!textTexture){
+void GuiText::setMaxWidth(float width) {
-        return;
+    this->maxWidth = width;
-    }
-
-    SDL_Rect rect;
-    rect.x = getLeft();
-    rect.y = getTop();
-    rect.w =  getScaleX() * getWidth();
-    rect.h = getScaleY() * getHeight();
-
-    // copy the texture to the rendering context
-    if(getAngle() == 0){
-        SDL_RenderCopy(pVideo->getRenderer(), textTexture, NULL, &rect);
-    }else{
-        SDL_RenderCopyEx(pVideo->getRenderer(), textTexture, NULL, &rect, getAngle(), NULL, SDL_FLIP_NONE);
-    }
 }

src/gui/GuiText.h

@@ -17,6 +17,7 @@
 #pragma once
 
 #include "GuiElement.h"
+#include "SDL_FontCache.h"
 #include <mutex>
 #include <SDL2/SDL_ttf.h>
 
@@ -33,7 +34,18 @@ public:
 
     void draw(CVideo *pVideo) override;
 
+    void process() override;
+
+    void setMaxWidth(float width);
+
 protected:
-    SDL_Surface *textSurface = nullptr;
+    std::string text;
-    SDL_Texture *textTexture = nullptr;
+    int32_t size;
+    SDL_Color color;
+    TTF_Font *ttf_font = nullptr;
+    FC_Font *fc_font = nullptr;
+    bool invalid = true;
+    bool updateText = true;
+
+    uint16_t maxWidth = 0xFFFF;
 };

src/gui/SDL_FontCache.h

@@ -0,0 +1,328 @@
+/*
+SDL_FontCache v0.10.0: A font cache for SDL and SDL_ttf
+by Jonathan Dearborn
+Dedicated to the memory of Florian Hufsky
+
+License:
+    The short:
+    Use it however you'd like, but keep the copyright and license notice
+    whenever these files or parts of them are distributed in uncompiled form.
+
+    The long:
+Copyright (c) 2019 Jonathan Dearborn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#ifndef _SDL_FONTCACHE_H__
+#define _SDL_FONTCACHE_H__
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_ttf.h>
+#include "../logger.h"
+
+#ifdef FC_USE_SDL_GPU
+    #include "SDL_gpu.h"
+#endif
+
+
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// Let's pretend this exists...
+#define TTF_STYLE_OUTLINE	16
+
+
+
+// Differences between SDL_Renderer and SDL_gpu
+#ifdef FC_USE_SDL_GPU
+#define FC_Rect GPU_Rect
+#define FC_Target GPU_Target
+#define FC_Image GPU_Image
+#define FC_Log GPU_LogError
+#else
+#define FC_Rect SDL_Rect
+#define FC_Target SDL_Renderer
+#define FC_Image SDL_Texture
+#define FC_Log DEBUG_FUNCTION_LINE
+#endif
+
+
+// SDL_FontCache types
+
+typedef enum
+{
+    FC_ALIGN_LEFT,
+    FC_ALIGN_CENTER,
+    FC_ALIGN_RIGHT
+} FC_AlignEnum;
+
+typedef enum
+{
+    FC_FILTER_NEAREST,
+    FC_FILTER_LINEAR
+} FC_FilterEnum;
+
+typedef struct FC_Scale
+{
+    float x;
+    float y;
+
+} FC_Scale;
+
+typedef struct FC_Effect
+{
+    FC_AlignEnum alignment;
+    FC_Scale scale;
+    SDL_Color color;
+
+} FC_Effect;
+
+// Opaque type
+typedef struct FC_Font FC_Font;
+
+
+typedef struct FC_GlyphData
+{
+    SDL_Rect rect;
+    int cache_level;
+
+} FC_GlyphData;
+
+
+
+
+// Object creation
+
+FC_Rect FC_MakeRect(float x, float y, float w, float h);
+
+FC_Scale FC_MakeScale(float x, float y);
+
+SDL_Color FC_MakeColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
+FC_Effect FC_MakeEffect(FC_AlignEnum alignment, FC_Scale scale, SDL_Color color);
+
+FC_GlyphData FC_MakeGlyphData(int cache_level, Sint16 x, Sint16 y, Uint16 w, Uint16 h);
+
+
+
+// Font object
+
+FC_Font* FC_CreateFont(void);
+
+#ifdef FC_USE_SDL_GPU
+Uint8 FC_LoadFont(FC_Font* font, const char* filename_ttf, Uint32 pointSize, SDL_Color color, int style);
+
+Uint8 FC_LoadFontFromTTF(FC_Font* font, TTF_Font* ttf, SDL_Color color);
+
+Uint8 FC_LoadFont_RW(FC_Font* font, SDL_RWops* file_rwops_ttf, Uint8 own_rwops, Uint32 pointSize, SDL_Color color, int style);
+#else
+Uint8 FC_LoadFont(FC_Font* font, SDL_Renderer* renderer, const char* filename_ttf, Uint32 pointSize, SDL_Color color, int style);
+
+Uint8 FC_LoadFontFromTTF(FC_Font* font, SDL_Renderer* renderer, TTF_Font* ttf, SDL_Color color);
+
+Uint8 FC_LoadFont_RW(FC_Font* font, SDL_Renderer* renderer, SDL_RWops* file_rwops_ttf, Uint8 own_rwops, Uint32 pointSize, SDL_Color color, int style);
+#endif
+
+#ifndef FC_USE_SDL_GPU
+// note: handle SDL event types SDL_RENDER_TARGETS_RESET(>= SDL 2.0.2) and SDL_RENDER_DEVICE_RESET(>= SDL 2.0.4)
+void FC_ResetFontFromRendererReset(FC_Font* font, SDL_Renderer* renderer, Uint32 evType);
+#endif
+
+void FC_ClearFont(FC_Font* font);
+
+void FC_FreeFont(FC_Font* font);
+
+
+
+// Built-in loading strings
+
+char* FC_GetStringASCII(void);
+
+char* FC_GetStringLatin1(void);
+
+char* FC_GetStringASCII_Latin1(void);
+
+
+// UTF-8 to SDL_FontCache codepoint conversion
+
+/*!
+Returns the Uint32 codepoint (not UTF-32) parsed from the given UTF-8 string.
+\param c A pointer to a string of proper UTF-8 character values.
+\param advance_pointer If true, the source pointer will be incremented to skip the extra bytes from multibyte codepoints.
+*/
+Uint32 FC_GetCodepointFromUTF8(const char** c, Uint8 advance_pointer);
+
+/*!
+Parses the given codepoint and stores the UTF-8 bytes in 'result'.  The result is NULL terminated.
+\param result A memory buffer for the UTF-8 values.  Must be at least 5 bytes long.
+\param codepoint The Uint32 codepoint to parse (not UTF-32).
+*/
+void FC_GetUTF8FromCodepoint(char* result, Uint32 codepoint);
+
+
+// UTF-8 string operations
+
+/*! Allocates a new string of 'size' bytes that is already NULL-terminated.  The NULL byte counts toward the size limit, as usual.  Returns NULL if size is 0. */
+char* U8_alloc(unsigned int size);
+
+/*! Deallocates the given string. */
+void U8_free(char* string);
+
+/*! Allocates a copy of the given string. */
+char* U8_strdup(const char* string);
+
+/*! Returns the number of UTF-8 characters in the given string. */
+int U8_strlen(const char* string);
+
+/*! Returns the number of bytes in the UTF-8 multibyte character pointed at by 'character'. */
+int U8_charsize(const char* character);
+
+/*! Copies the source multibyte character into the given buffer without overrunning it.  Returns 0 on failure. */
+int U8_charcpy(char* buffer, const char* source, int buffer_size);
+
+/*! Returns a pointer to the next UTF-8 character. */
+const char* U8_next(const char* string);
+
+/*! Inserts a UTF-8 string into 'string' at the given position.  Use a position of -1 to append.  Returns 0 when unable to insert the string. */
+int U8_strinsert(char* string, int position, const char* source, int max_bytes);
+
+/*! Erases the UTF-8 character at the given position, moving the subsequent characters down. */
+void U8_strdel(char* string, int position);
+
+
+// Internal settings
+
+/*! Sets the string from which to load the initial glyphs.  Use this if you need upfront loading for any reason (such as lack of render-target support). */
+void FC_SetLoadingString(FC_Font* font, const char* string);
+
+/*! Returns the size of the internal buffer which is used for unpacking variadic text data.  This buffer is shared by all FC_Fonts. */
+unsigned int FC_GetBufferSize(void);
+
+/*! Changes the size of the internal buffer which is used for unpacking variadic text data.  This buffer is shared by all FC_Fonts. */
+void FC_SetBufferSize(unsigned int size);
+
+/*! Returns the width of a single horizontal tab in multiples of the width of a space (default: 4) */
+unsigned int FC_GetTabWidth(void);
+
+/*! Changes the width of a horizontal tab in multiples of the width of a space (default: 4) */
+void FC_SetTabWidth(unsigned int width_in_spaces);
+
+void FC_SetRenderCallback(FC_Rect (*callback)(FC_Image* src, FC_Rect* srcrect, FC_Target* dest, float x, float y, float xscale, float yscale));
+
+FC_Rect FC_DefaultRenderCallback(FC_Image* src, FC_Rect* srcrect, FC_Target* dest, float x, float y, float xscale, float yscale);
+
+
+// Custom caching
+
+/*! Returns the number of cache levels that are active. */
+int FC_GetNumCacheLevels(FC_Font* font);
+
+/*! Returns the cache source texture at the given cache level. */
+FC_Image* FC_GetGlyphCacheLevel(FC_Font* font, int cache_level);
+
+// TODO: Specify ownership of the texture (should be shareable)
+/*! Sets a cache source texture for rendering.  New cache levels must be sequential. */
+Uint8 FC_SetGlyphCacheLevel(FC_Font* font, int cache_level, FC_Image* cache_texture);
+
+/*! Copies the given surface to the given cache level as a texture.  New cache levels must be sequential. */
+Uint8 FC_UploadGlyphCache(FC_Font* font, int cache_level, SDL_Surface* data_surface);
+
+
+/*! Returns the number of codepoints that are stored in the font's glyph data map. */
+unsigned int FC_GetNumCodepoints(FC_Font* font);
+
+/*! Copies the stored codepoints into the given array. */
+void FC_GetCodepoints(FC_Font* font, Uint32* result);
+
+/*! Stores the glyph data for the given codepoint in 'result'.  Returns 0 if the codepoint was not found in the cache. */
+Uint8 FC_GetGlyphData(FC_Font* font, FC_GlyphData* result, Uint32 codepoint);
+
+/*! Sets the glyph data for the given codepoint.  Duplicates are not checked.  Returns a pointer to the stored data. */
+FC_GlyphData* FC_SetGlyphData(FC_Font* font, Uint32 codepoint, FC_GlyphData glyph_data);
+
+
+// Rendering
+
+FC_Rect FC_Draw(FC_Font* font, FC_Target* dest, float x, float y, const char* formatted_text, ...);
+FC_Rect FC_DrawAlign(FC_Font* font, FC_Target* dest, float x, float y, FC_AlignEnum align, const char* formatted_text, ...);
+FC_Rect FC_DrawScale(FC_Font* font, FC_Target* dest, float x, float y, FC_Scale scale, const char* formatted_text, ...);
+FC_Rect FC_DrawColor(FC_Font* font, FC_Target* dest, float x, float y, SDL_Color color, const char* formatted_text, ...);
+FC_Rect FC_DrawEffect(FC_Font* font, FC_Target* dest, float x, float y, FC_Effect effect, const char* formatted_text, ...);
+
+FC_Rect FC_DrawBox(FC_Font* font, FC_Target* dest, FC_Rect box, const char* formatted_text, ...);
+FC_Rect FC_DrawBoxAlign(FC_Font* font, FC_Target* dest, FC_Rect box, FC_AlignEnum align, const char* formatted_text, ...);
+FC_Rect FC_DrawBoxScale(FC_Font* font, FC_Target* dest, FC_Rect box, FC_Scale scale, const char* formatted_text, ...);
+FC_Rect FC_DrawBoxColor(FC_Font* font, FC_Target* dest, FC_Rect box, SDL_Color color, const char* formatted_text, ...);
+FC_Rect FC_DrawBoxEffect(FC_Font* font, FC_Target* dest, FC_Rect box, FC_Effect effect, const char* formatted_text, ...);
+
+FC_Rect FC_DrawColumn(FC_Font* font, FC_Target* dest, float x, float y, Uint16 width, const char* formatted_text, ...);
+FC_Rect FC_DrawColumnAlign(FC_Font* font, FC_Target* dest, float x, float y, Uint16 width, FC_AlignEnum align, const char* formatted_text, ...);
+FC_Rect FC_DrawColumnScale(FC_Font* font, FC_Target* dest, float x, float y, Uint16 width, FC_Scale scale, const char* formatted_text, ...);
+FC_Rect FC_DrawColumnColor(FC_Font* font, FC_Target* dest, float x, float y, Uint16 width, SDL_Color color, const char* formatted_text, ...);
+FC_Rect FC_DrawColumnEffect(FC_Font* font, FC_Target* dest, float x, float y, Uint16 width, FC_Effect effect, const char* formatted_text, ...);
+
+
+// Getters
+
+FC_FilterEnum FC_GetFilterMode(FC_Font* font);
+Uint16 FC_GetLineHeight(FC_Font* font);
+Uint16 FC_GetHeight(FC_Font* font, const char* formatted_text, ...);
+Uint16 FC_GetWidth(FC_Font* font, const char* formatted_text, ...);
+
+// Returns a 1-pixel wide box in front of the character in the given position (index)
+FC_Rect FC_GetCharacterOffset(FC_Font* font, Uint16 position_index, int column_width, const char* formatted_text, ...);
+Uint16 FC_GetColumnHeight(FC_Font* font, Uint16 width, const char* formatted_text, ...);
+
+int FC_GetAscent(FC_Font* font, const char* formatted_text, ...);
+int FC_GetDescent(FC_Font* font, const char* formatted_text, ...);
+int FC_GetBaseline(FC_Font* font);
+int FC_GetSpacing(FC_Font* font);
+int FC_GetLineSpacing(FC_Font* font);
+Uint16 FC_GetMaxWidth(FC_Font* font);
+SDL_Color FC_GetDefaultColor(FC_Font* font);
+
+FC_Rect FC_GetBounds(FC_Font* font, float x, float y, FC_AlignEnum align, FC_Scale scale, const char* formatted_text, ...);
+
+Uint8 FC_InRect(float x, float y, FC_Rect input_rect);
+// Given an offset (x,y) from the text draw position (the upper-left corner), returns the character position (UTF-8 index)
+Uint16 FC_GetPositionFromOffset(FC_Font* font, float x, float y, int column_width, FC_AlignEnum align, const char* formatted_text, ...);
+
+// Returns the number of characters in the new wrapped text written into `result`.
+int FC_GetWrappedText(FC_Font* font, char* result, int max_result_size, Uint16 width, const char* formatted_text, ...);
+
+// Setters
+
+void FC_SetFilterMode(FC_Font* font, FC_FilterEnum filter);
+void FC_SetSpacing(FC_Font* font, int LetterSpacing);
+void FC_SetLineSpacing(FC_Font* font, int LineSpacing);
+void FC_SetDefaultColor(FC_Font* font, SDL_Color color);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+
+#endif