some optimizations and compilation changes

* speedup render of widget images on low end devices using mipmaps
* changes in CMakeLists.txt to allow usage of distcc and crosscompiling

src/framework/CMakeLists.txt

@@ -37,15 +37,15 @@ FIND_PACKAGE(ZLIB REQUIRED)
 # setup compiler options
 IF(CMAKE_COMPILER_IS_GNUCXX)
     SET(CXX_WARNS "-Wall -Wextra -Werror -Wno-unused-parameter -Wno-unused-but-set-variable")
-    SET(CMAKE_CXX_FLAGS                "-std=gnu++0x -pipe ${CXX_WARNS}")
-    SET(CMAKE_C_FLAGS                  "-pipe ${CXX_WARNS}")
+    SET(CMAKE_CXX_FLAGS                "${CMAKE_CXX_FLAGS} ${CXX_WARNS} -std=gnu++0x -pipe")
+    SET(CMAKE_C_FLAGS                  "${CMAKE_C_FLAGS} ${CXX_WARNS} -pipe")
     SET(CMAKE_CXX_FLAGS_DEBUG          "-O0 -g -ggdb")
     SET(CMAKE_C_FLAGS_DEBUG            "-O0 -g -ggdb")
     SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O1 -g -ggdb")
     SET(CMAKE_C_FLAGS_RELWITHDEBINFO   "-O1 -g -ggdb")
     SET(CMAKE_CXX_FLAGS_RELEASE        "-O2")
     SET(CMAKE_C_FLAGS_RELEASE          "-O2")
-    SET(CMAKE_CXX_LINK_FLAGS           "-static-libgcc -static-libstdc++ -Wl,--as-needed")
+    SET(CMAKE_CXX_LINK_FLAGS           "${CMAKE_CXX_LINK_FLAGS} -static-libgcc -static-libstdc++ -Wl,--as-needed")
 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 
 IF(CMAKE_BUILD_TYPE STREQUAL "Debug")

src/framework/graphics/texture.cpp

@@ -98,8 +98,8 @@ void Texture::generateMipmaps()
 {
     bind();
 
-    if(!m_useMipmaps) {
-        m_useMipmaps = true;
+    if(!m_hasMipmaps) {
+        m_hasMipmaps = true;
         setupFilters();
     }
 
@@ -141,8 +141,8 @@ void Texture::generateBilinearMipmaps(std::vector<uint8> inPixels)
 {
     bind();
 
-    if(!m_useMipmaps) {
-        m_useMipmaps = true;
+    if(!m_hasMipmaps) {
+        m_hasMipmaps = true;
         setupFilters();
     }
 
@@ -204,10 +204,10 @@ void Texture::setupFilters()
     GLint minFilter;
     GLint magFilter;
     if(m_smooth) {
-        minFilter = m_useMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
+        minFilter = m_hasMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
         magFilter = GL_LINEAR;
     } else {
-        minFilter = m_useMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
+        minFilter = m_hasMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
         magFilter = GL_NEAREST;
     }
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);

src/framework/graphics/texture.h

@@ -48,7 +48,8 @@ public:
     int getHeight() { return m_size.height(); }
     const Size& getSize() { return m_size; }
 
-    bool isEmpty() const { return m_textureId == 0; }
+    bool isEmpty() { return m_textureId == 0; }
+    bool hasMipmaps() { return m_hasMipmaps; }
 
 protected:
     void setupFilters();
@@ -56,7 +57,7 @@ protected:
 
     GLuint m_textureId;
     Size m_size;
-    Boolean<false> m_useMipmaps;
+    Boolean<false> m_hasMipmaps;
     Boolean<false> m_smooth;
 };
 

src/framework/ui/uiwidgetimage.cpp

@@ -160,6 +160,11 @@ void UIWidget::drawImage(const Rect& screenCoords)
     }
 
     m_imageTexture->setSmooth(m_imageSmooth);
+
+    // this will increase fps when rendering larger images, like the background, and improve image quality
+    if(m_imageSmooth && !m_imageTexture->hasMipmaps())
+        m_imageTexture->generateMipmaps();
+
     g_painter.setColor(m_imageColor);
     g_painter.drawTextureCoords(m_imageCoordsBuffer, m_imageTexture);
 }